CN101957471B - Optical film, assembly and display device - Google Patents

Abstract

Microstructured optical films, assemblies of films including at least one microstructured optical film, and (e.g. illuminated) display devices including a single microstructured optical film or assembly.

Description

Blooming, assembly and display device

The application be that June 16, application number in 2005 are 200580020135.3 the applying date, denomination of invention divides an application for the patented claim of " blooming, assembly and display device ".

Related application

The application is: the part continuation application of the U.S. Patent application No.10/870366 that on June 17th, 2004 submitted to; The part continuation application of the U.S. Patent application No.10/939184 that on September 10th, 2004 submitted to; The part continuation application of the U.S. Patent application No.10/938006 that on September 10th, 2004 submitted to; And the part continuation application of the U.S. Patent application No.11/078145 of submission on March 11st, 2005.

Background technology

Certain slightly the optical articles of science (for example, such as U.S. Patent No. 5,175,030 and 5,183,597 is described) be commonly called " brightness enhancement film ".The brightness enhancement film of utilizing many electronic products improves the brightness of flat-panel monitor backlight, wherein flat-panel monitor backlight can be for example liquid crystal display (LCD), is included in used those in electroluminescent panel, laptop display, word processor, both desktop monitors, televisor, video camera and automobile and the aviation display.

Brightness enhancement film advantageously shows specific optical property and physical property, and these performances comprise the brightness enhancement film refractive index that has correlativity with the luminance gain that produces (i.e. " gain ").The brightness that improves can make electronic product more effectively work, thereby this realizes by the mode that reduces power consumption with lower power and make the parts of electronic product produce lower thermal load and prolong the serviceable life of product in display illumination.

For example, such as U.S. Patent No. 5,908,874,5,932,626,6,107,364,6,280,063,6,355,754 and patent documentation EP 1 014113 and WO 03/076528 described, by refractive index high through solidifying or the monomer of polymerization has been made brightness enhancement film.

Although it is known that multiple brightness enhancement film is arranged, the industry still can benefit from performance improve (for example gain higher) blooming (for example brightness enhancement film) and comprise at least assembly of the described blooming of a slice.This film and assembly can be used in the display device.

Summary of the invention

The present invention describes is blooming with microstructured surface polymeric material (as the microstructured surface with the repeat patterns that is made of the prism of arranging by line style), that the comprise light-permeable blooming of light (as be suitable for guiding).

In one embodiment, described film is that its monolithic relative gain is at least 1.78 basically unpolarized film.

In another embodiment, described film is that its monolithic relative gain is at least 2.46 reflective polarizer films.Described microstructured surface can have by pattern substantially parallel and that vertical with the light transmission shaft (pass axis) of reflectivity polarization bottom film prism consists of.

In other embodiments, the present invention relates to assembly, wherein this assembly comprises first microstructured optical films close with the second blooming.

In other embodiments, the present invention relates to display device, wherein this display device has the blooming of making through above-mentioned embodiment or the assembly of making through above-mentioned embodiment, and this blooming or this assembly and light-emitting area are close.

In one aspect, described assembly comprises first microstructured optical films close with non-structured reflective polarizer films, and the gain that the assembly that is made of described the first film and described polarizing coating has is at least 2.59.In this assembly, the prism of microstructured optical films is preferred vertical with the light transmission shaft of reflective polarizer films.

In one aspect of the method, described assembly comprises and the second close the first unpolarized microstructured optical films basically of unpolarized microstructured optical films basically, wherein, the relative gain that the assembly that is made of described the first film and described the second film has is at least 2.80.Described the second film is arranged such that prismatic not parallel (as becoming the angle of 90 degree+/-20 degree) that its contained prism and described the first film are contained.This assembly can also comprise the 3rd blooming (for example non-structured reflecting polarizer), and the 3rd blooming is between first blooming and the second blooming of described assembly, and is perhaps close with the first blooming or second blooming of described assembly.This assembly that is made of three films can have at least 3.40 relative gain.

In one aspect of the method, described assembly comprises the micro-structural reflective polarizer films close with unpolarized microstructured optical films basically, and the relative gain of the described assembly that is made of described the first film and described the second film is at least 3.33.

In a further aspect, optical film assembly is described to: it comprises first blooming with microstructured surface close with the second blooming, and this first blooming is made of the polymeric material of the light-permeable that comprises 10 % by weight inorganic nanoparticles at least.

In each embodiment in these embodiments, microstructured surface all is preferably and comprises refractive index and be the reaction product of this class polymerizing resin of at least 1.61.In addition, described polymerizing resin preferably has low absorbance.Microstructured surface comprises the reaction product of such polymerisable compound usually, and described polymerisable compound comprises the inorganic nanoparticles of at least a ethylenically unsaturated monomers, optional at least a ethylenic unsaturated oligomers and at least 10 % by weight.Zirconia is preferred inorganic nanoparticles.Described inorganic nanoparticles is preferably the fully inorganic nanoparticles of the process surface modification of cohesion.

Blooming of the present invention can have the bottom of being combined with described microstructured surface.In such embodiments, the bottom of blooming has the high index axle, and the microstructured surface of this blooming comprises parallel prism, and preferably, described prism is arranged as with the high index axle of described bottom and becomes 90 degree+/-20 to spend.

Brief Description Of Drawings

Fig. 1 is the stereographic map with exemplary optics product of microstructure of the present invention.

Fig. 2 is the synoptic diagram that contains the exemplary backlight liquid crystal display of brightness enhancement film of the present invention.

Fig. 3 is that the absorbance of two kinds of different polymerisable compounds is as the exemplary relation figure of the function of wavelength.

Fig. 4 is the exemplary conoscopic interference figure of the luminance brightness of liquid crystal display.

Detailed Description Of The Invention

The present invention relates to microstructured optical films, comprise at least the membrane module of the described microstructured optical films of a slice and the display device (such as illuminated display device) that comprises the described microstructured optical films of single a slice or a single described assembly.

Usually, blooming is the film of light-permeable.Many bloomings are designed to change wave vector, thereby and change light by the opticpath of film.This can realize by for example introducing microstructured surface, lacklustre surface, minute surface and body diffusion.

Term as used herein " film or film " refers to that its thickness is significantly less than the substantitally planar structure of its width and length (for example, little at least 10 times than width and length) usually.The thickness of blooming is generally at least 25 microns.Although the thickness of blooming can arrive greatly for example 3cm, usually less than 2mm, more typically less than 800 microns.

The blooming of preferred type has microstructured surface (as have a plurality of prisms at film surface), so that this film can be used for making light (such as the light of diffused light source) change direction by reflection and refraction.This film is commonly called brightness enhancement film and light control film.

Typical brightness enhancement film has such microstructured surface, and this microstructured surface has the regular repeat patterns that is made of the top rib of symmetry and groove.Other example of channel patterns comprises such pattern, and wherein top rib and groove are asymmetric, and the size of top rib and groove, orientation or distance are also inconsistent.

With reference to figure 1, microstructured optical films 30 can have bottom 2 and microstructured optical layer 4.Can be for the another kind of mode of selecting, microstructured optical films can be all-in-one-piece, and wherein bottom is made of identical material with optical layers.The monoblock type microstructured optical films can be by known method preparation, as making by the molten thermoplastic resin is extruded.Optical layers 4 has the line style that is made of the rectangular prism of rule (being denoted as prismatic 6,8,12 and 14 among the figure) and arranges.The height of described prism is generally about 1 micron to about 75 microns.Each prism (such as prismatic 6) all has the first faceted pebble 10 and the second faceted pebble 11.Prismatic 6,8,12 and 14 form at bottom 2, bottom 2 have first surface 18 and the substantially flat that is formed with described prism thereon or be the plane and with the opposing second surface 20 of first surface 18.Rectangular prism refers to that apex angle α generally is about the prism of 90 degree.But, this angle can for 70 the degree to 120 the degree, and can for 80 the degree to 100 the degree.In addition, these peaks can be for sharp-pointed, circular, smooth or truncate.Approximate representation is come for circular its drift angle of prism can intersect angulation by (as smooth) faceted pebble in the peak.Each faceted pebble needn't be necessarily identical, and prism can be tilted in relation to each other.Prism heights in the described arrangement can be substantially the same, also can be different.The gross thickness 24 of optical goods and the relation between the prism heights 22 can change.Yet, usually wish to use to have the relatively thin optical layers of clear and definite faceted pebble.Prism heights 22 is generally 25/125 to 2/125 with the typical ratio of gross thickness 24.

If the function of blooming is to make light change direction, a plurality of surface structures of blooming can have different spacings, form different intersection trench and/or have different prismatic angles so.For example, a plurality of surface structures of blooming can form pseudorandom prismatic the fluctuating, as in U.S. Patent No. 6,322, described in 236.Surface structures can have the face more than three, so surface structures also has other shape, such as pyramid.In addition, the face that surface structures has can be sphere, and/or is the non-triangular shaped face with other.According to described shape, what surface structures can be for non-prism-shaped.

There is the multiple polymers material to can be used as primer and/or microstructured optical layer.Suitable material has enough optical transparences and structure is enough solid, in order to be assembled into or be used for concrete optical articles.Preferably, select to temperature and aging primer with enough tolerances, so that the performance of optical articles does not descend in time.

The concrete chemical component of primer and/or microstructured optical layer and thickness can be depending on the requirement of the particular optical product that will construct.That is to say, between intensity, transparency, temperature tolerance, surface energy, requirements such as adhesiveness to optical layers, carry out balance.The thickness of bottom is generally at least about 0.025 millimeter (mm), is more typically at least about 0.125mm.In addition, the thickness of bottom is usually up to about 1mm.

Available primer and/or microstructured optical layer material comprise glass and multiple polymers material, and described polymeric material comprises cellulose acetate-butyrate, cellulose-acetate propionate, cellulose triacetate, polyethersulfone, polymethylmethacrylate, polyurethane, polyester, polycarbonate, Polyvinylchloride, syndiotactic polytyrene, PEN, norbornene polymer, based on multipolymer or the blend of naphthalene dicarboxylic acids.Optional is that primer can comprise potpourri or the composition of above-mentioned these materials.For example, bottom may be multilayer, and perhaps bottom may comprise and suspends or be dispersed in disperse phase in the external phase.Exemplary primer comprises polyethylene terephthalate (PET) and polycarbonate.The example of available PET film comprises the PET (can available from the DuPont Films company that is positioned at Delaware, USA Wilmington city) of photographic-grade (photograde) polyethylene terephthalate (PET) and commodity " Melinex " by name.

The film of being made by this class primer has the certain birefringence that is produced by film production method usually.Although the microstructured optical films by this class primer preparation also has this birefringence, usually this film is not called polarizing coating, because this blooming can not be used as polaroid in illuminated display (such as LCD).In this article, " basically unpolarized blooming " variation of referring to function, its diffuse reflectance as polarization is less than 0.05 blooming.In addition, this film (such as the film that is stretched in process of production), usually also have such feature: the refractive index on its some axle (such as machine direction) is higher than the refractive index on other axle (such as horizontal dimension direction).

Differently therewith be, " polarization by reflection optics film " refer to as polarization function, its diffuse reflectance be changed at least 0.05 blooming.Polarization by reflection optics film usually to the reflectivity of a certain polarization mode apparently higher than its reflectivity to another kind of polarization mode.Along with the variation of polarization mode, the variation of its diffuse reflectance is generally at least 0.1, is more typically at least 0.2.

Micro-structural polarization by reflection optics film can be made by the primer that has optical activity and can bring into play the effect of polarized material.Known many primers can be used as polarized material.Light polarization can also be by introducing inorganic material (for example mica sheet of orientation) or realizing by being dispersed in discontinuous phase in the continuous film (for example being dispersed in the optical modulation liquid crystal that one-tenth in the continuous film drips shape).As can for the another kind of mode of selecting, making film by the meagre layer of different materials.For example can make polarized material orientation on the polarization direction in the film by adopting such as oriented film, the method that applies electric field or magnetic field and coating technology.

The example of polarizing coating is included in U.S. Patent No. 5,825, those that describe in 543 and 5,783,120.The multilayer polarizing coating is sold with trade name DBEF (reflecting type polarizing brightness enhancement film (Dual Brightness Enhancement)) by the 3M company that is positioned at St.Paul city, Minn..The application of this multilayer polarization optics film in brightness enhancement film be in U.S. Patent No. 5,828, describes to some extent in 488, and this patent is incorporated herein by reference.Other example of polarizing coating is in U.S. Patent No. 5,882, describes to some extent in 774,5,965,247,6,025,897.Other polarizing coating and unpolarized film also can be as the bottoms of brightness enhancement film of the present invention, and for example U.S. Patent No. 5,612, and the institutes such as 820 and 5,486,949 are described.

In some embodiments, non-structured polarizing coating and unpolarized film can be as the bottom of microstructured optical films basically.In other embodiments, non-structured polarizing coating and basically unpolarized film be combined with a slice microstructured optical films at least and be applied in the assembly.In this article, " non-structured polarizing coating " refers to not have the film of (such as prism-shaped) surface structures.Non-structured polarizing coating can have smooth, lacklustre or coarse surface.

Brightness enhancement film mainly improves luminosity (being referred to herein as " brightness ") on the axle of lighting device.When microstructured optical films be applied to (such as) in the optical display of laptop computer, time set etc. the time, this microstructured optical films can improve the brightness of optical display in the following way: the light that will escape out from display is limited in the pair of planar, and this is configured to become with normal axis by optical display required angle to the plane.The result, those light that exceed permissible range that penetrate from display are reflected back to the display, a part of light in the wherein said reflected light can " recycle " and is turned back in the micro-structural film with certain angle, so that the light of this angle can be escaped out from display.This recycle is useful, because it can be reduced to the required power consumption of luminance level that display provides expectation.

The common methods of measuring the validity of this light recycle is the gain of measuring blooming.In this article, " relative gain " is defined as: when placing blooming (or optical film assembly) on the light box, according to the ratio of luminance brightness on luminance brightness on the measured axle of the test method of describing among the embodiment and the axle measured when light box does not have blooming.This definition can be summarized as following relation:

Relative gain=(in that luminance brightness measured in the situation of blooming is arranged)/(not having luminance brightness measured in the situation of blooming)

What the present invention described is blooming and the optical film assembly that shows higher relative gain.

In one embodiment, described a kind of like this blooming, this blooming has microstructured surface, and comprises the polymeric material (such as the polymeric material that solidifies) of printing opacity.This blooming is unpolarized film basically, and its monolithic relative gain (single sheet relative gain) is at least 1.78; And its relative monolithic gain is not more than 2.05 usually.Therefore, the monolithic relative gain of this blooming also can be any numerical value in the numerical value group that comprises following relative gain numerical value: 1.80,1.82,1.84,1.86,1.88,1.90,1.92,1.94,1.96,1.98,2.00 and 2.02.

In another embodiment, described the polarization by reflection optics film with microstructured surface, wherein, this film comprises the polymeric material (such as the polymeric material that solidifies) of printing opacity, and the monolithic relative gain of this film is at least 2.46; And its relative monolithic gain is usually less than 3.02.Therefore, the monolithic relative gain of this blooming also can be any numerical value in the numerical value group that comprises following relative gain numerical value: 2.48,2.50,2.52,2.54,2.56,2.58,2.60,2.62,2.64,2.66,2.68,2.70,2.72,2.74,2.76,2.78,2.80,2.82,2.84,2.86,2.88,2.90,2.92,2.94,2.96,2.98 and 3.00.At reflective polarizer films during as the bottom of microstructured optical films (such as the prism-shaped microstructured optical films), preferably, (as by the line style arrangement) prism or groove are arranged in rows in the direction with the light transmission shaft perpendicular of reflective polarizer films.

In other embodiments, the present invention relates to comprise the multiple assembly of two or multi-disc film, the multiple assembly that is perhaps consisted of by two or multi-disc film.Various assemblies all comprise first microstructured optical films close with second (such as micro-structural or non-structured) blooming.

Described near referring to approach fully.Close mode can comprise that the first microstructured optical films contacts with the second blooming,, perhaps can these films be linked together by several different methods for example only with these pellicular cascades together.Can these films be linked together by mechanical means, chemical method, by the use of thermal means or its combination.Chemical method comprises various contact adhesives, solvent-based adhesive, hot-melt adhesive and crosslinked curable two component adhesive composition occurs when being exposed to heat, steam or radiation.By the use of thermal means comprises roller platen, radio frequency (RF) welding and the ultrasonic soldering of for example heating.The whole plane (perhaps only on selected point or only on its edge) that can cross (for example crossing continuously) blooming links together blooming.Can be for the another kind of mode of selecting, can be with Air Interface that close blooming is separated from one another.Air Interface can produce by any one or both the peripheral thickness (for example by applying bonding agent) that increases in two close bloomings.When blooming was stacked rather than laminated together, the Air Interface between the blooming may only have several microns.

In some embodiments, the first microstructured optical films and the second microstructured optical films are close.In this assembly, the microstructured surface of end film preferably is arranged to the destructuring surface of top film close.For the embodiment that adopts prism-shaped micro-structural film, the prism of film is arranged in parallel in a main direction usually, and these prisms are separated by groove.Usually preferably, the prism (or groove) with second in the membrane stack (such as the bottom) microstructured optical films is arranged in: so that as described in the prismatic perpendicular of prism and first (such as the top) film.Yet, also can adopt other arrangement mode.For example, the prism of the second blooming can be arranged to respect to the prism of the first blooming: so that the groove of these two bloomings or prismatic the intersection into about the angle of 70 degree to about 120 degree.

In the assembly of an embodiment, first basically unpolarized microstructured optical films and second unpolarized microstructured optical films is close basically.The gain of this assembly is at least 2.80.The first blooming can be identical with the second blooming, also can be different.For example, the second film can contain different foundation compositions, can contain different microstructured surface compositions, and/or can have different surface micro-structures.The relative gain of this assembly is usually less than 3.32.Therefore, the relative gain of this assembly also can be any numerical value in the numerical value group that comprises following relative gain numerical value: 2.81,2.82,2.84,2.86,2.88,2.90,2.92,2.94,2.96,2.98,3.00,3.02,3.04,3.06,3.08,3.10,3.12,3.14,3.16,3.18,3.20,3.22,3.24,3.26,3.28 and 3.30.

Polarization by reflection optics film can be become various assemblies with other combination of optical films.Combination is particularly useful for the output of the particular light ray direction that improves diffused light source and specific polarization pattern like this, and also particularly useful for the brightness that improves liquid-crystal apparatus.

In the assembly of an embodiment, first unpolarized micro-structural (such as prism-shaped) blooming and non-structured reflective polarizer films are close basically.The gain of this assembly is at least 2.59.The relative gain of this assembly is usually less than 2.86.Therefore, the relative gain of this assembly also can be any numerical value in the numerical value group that comprises following relative gain numerical value: 2.60,2.62,2.64,2.66,2.68,2.70,2.72,2.74,2.76,2.78,2.80,2.82 and 2.84.In this assembly, preferably, will have the prism of film of prism-shaped microstructure or groove and be arranged in light transmission shaft perpendicular with non-structured reflective polarizer films.

In the assembly of another embodiment, first unpolarized microstructured optical films and micro-structural reflective polarizer films are close basically.The relative gain of this assembly is generally at least 3.33.In addition, the relative gain of this assembly is usually less than 4.20.Therefore, the relative gain of this assembly also can be any numerical value in the numerical value group that comprises following relative gain numerical value: 3.34,3.36,3.38,3.40,3.42,3.44,3.46,3.48,3.50,3.52,3.54,3.56,3.58,3.60,3.62,3.64,3.66,3.68,3.70,3.72,3.74,3.76,3.78,3.80,3.82,3.84,3.86,3.88,3.90,3.92,3.94,3.96,3.98,4.00,4.02,4.04,4.06,4.08,4.10,4.12,4.14,4.16 and 4.18.

The various assemblies that consisted of by microstructured optical films can also with the 3rd combination of optical films.Yet the micro-structural film with prismatic structure close to each other that common this assembly comprises is no more than two.A kind of preferred assembly comprises mutually the close first basically unpolarized microstructured optical films and non-structured polarization by reflection optics film of unpolarized microstructured optical films and second basically.Reflective polarizer films is adjacent to arrange with the assembly that is made of non-reflective polarizing coating usually.In use, membrane stack is arranged in the display device so that reflective polarizer films from light source away from.The relative gain of this trilamellar membrane heap is generally at least 3.40, and usually is not more than 3.72.Yet, the alternate manner that can Gong select is, non-structured polarization by reflection optics film can be arranged in the first unpolarized micro-structural film and second basically between the unpolarized micro-structural film basically, perhaps can be arranged in first basically unpolarized micro-structural film and second basically unpolarized micro-structural film below.

Known from electromagnetic theory, refractive index and on-axis gain normally have direct relation.Therefore, there is multinomial patent to relate to the material that refractive index is higher and is used for brightness enhancement film.Yet the inventor finds, independent high refractive index material may not one provides higher gain surely, and is particularly all the more so for assembly.The present invention describes is by the blooming of polymerizing resin (it has the synergetic of enough refractive index and low light absorptive) preparation and the assembly that is made of two or the described blooming of multi-disc.

Use 6208 type refractometers of Fischer Scientific company to measure, the refractive index of the organic principle in the polymerisable compound can be at least 1.48,1.49,1.50,1.51,1.52,1.53,1.54,1.55,1.56,1.57,1.58,1.59,1.60,1.61 or 1.62.The refractive index of polymerisable compound (as optionally comprising the polymerisable compound of particle) can be up to 1.70.The refractive index of polymerisable compound is at least 1.58,1.59,1.60,1.61,1.62,1.63,1.64,1.65,1.66,1.67,1.68 or 1.69.Usually, the refractive index of resin can raise about 0.01 to 0.03 when solidifying.The refractive index of solidifying can be measured by multiple technologies as known in the art (such as ellipsometry).

Fig. 3 be the absorbance (be according to the test method measuring described in the embodiment) of representative polymerizable resin composition (being the polymerizable resin composition 12 and 13 among the embodiment) as the graph of a relation of the function of wavelength, wherein polymerizable resin composition 12 and 13 is respectively applied to prepare respectively do for oneself 1.793 and 1.829 basically unpolarized microstructured optical films of relative gain value (being monolithic relative gain value).Therefore, polymerisable compound 12 is to be applicable to prepare the representative of this composition that relative gain value (being monolithic relative gain value) approaches the microstructured optical films of minimum preferred value 1.78.

As can be seen from Figure 3, these polymerizable resin compositions in the absorbance of about 575nm in the wavelength coverage of 800nm all less than 1.In the absorbance at 450nm place less than 2.5 (as less than 2.25).Absorbance at about 500nm place is not more than 1.75.In the absorbance at 550nm place less than 1.5 (as less than 1.25).

To be prepared as by the basically unpolarized microstructured optical films that representational polymerizing resin 12 and 13 is made have the separately membrane stack assembly of (it is made of two identical films), the bottom of the prism-shaped microstructured surface of end film contact top film wherein, and so that the prism of end film and top film prismatic vertical.The relative gain of the assembly of making from polymerizing resin 12 is 2.652; And the relative gain of the assembly of being made by polymerizing resin 13 is 2.807.

Although the absorbance of polymerizing resin 12 is enough low, can obtain the high single a slice microstructured optical films of yield value, when being combined as assembly, the light absorptive of being contributed by polymerizing resin is by compound.Therefore, in assembly of the present invention, representational polymerizing resin 12 has too high light absorptive; And polymerizing resin 13 is a kind of like this representative compositions, and its absorbance approaches with maximal value in the absorbance that is suitable for producing the assembly (assembly that does not namely have reflective polarizer films) with preferred yield value of at least 2.80.

Therefore, the preferred polymerizable resin composition that is used for assembly in the absorbance at 450nm wavelength place less than 2., be more preferably less than 1, even be more preferably less than 0.75 preferably less than 1.5 in the absorbance at 450nm wavelength place.Preferably less than 1.5, be more preferably less than 1.0 in the absorbance at about 500nm place, be more preferably less than 0.5.At the wavelength place of about 550nm, the absorbance of polymerizing resin is more preferably less than 0.5 preferably less than 1.To the wavelength place between the 800nm, the absorbance of polymerizing resin is preferably less than 0.5 at 500nm.At about 600nm to the wavelength coverage internal absorbance of 800nm preferably less than 0.25.

Absorbance can be compensated by the polymerizable resin composition that utilizes refractive index higher (such as 1.64) to a certain extent on the impact of relative gain.In this embodiment, permissible absorbance numerical value can be higher.

Various microstructured optical films as herein described and assembly can be advantageously used in the various displays, comprise back lighting device, the back lighting device of edge light, the LCD of light emitting diode (LED) back lighting, CCFL back-lit displays, the display of field-sequential method, the scanning backlight device of (for example) direct illumination.Usually introducing microstructured optical films or assembly improves brightness and/or reduces power consumption.Other parts in microstructured optical films or assembly and the display device are close.The synoptic diagram of exemplary backlight liquid crystal display is presented at 110 places of Fig. 2 by summary.In the display of reality, the parts shown in various contact with brightness enhancement film usually.Brightness enhancement film 111 of the present invention is usually located between light guide sheet 118 and the LCD panel 114.LCD panel all has (for example, absorbing) polaroid usually on its two sides.Therefore, this (for example, absorbing) polaroid is in the position adjacent with brightness enhancement film of the present invention.In this display device, with prism in the hithermost prism sheet of polaroid (for example absorptive polarizer) or groove preferred arrangement be light transmission shaft perpendicular with adjacent absorptive polarizer.In addition, when blooming or assembly comprised reflecting polarizer, the light transmission shaft of the absorptive polarizer in the light transmission shaft that makes this reflecting polarizer and the display device was aimed at.Backlight liquid crystal display can also comprise light source 116 (for example fluorescent light) and white light reflection device 120 (also being used for light is reflected to LCD panel).The light that brightness enhancement film 111 calibrations are sent from light guide sheet 118, the brightness that improves thus LCD panel 114.The raising of brightness is so that LCD panel produces more clearly image, and can reduce the power that light source 116 is used for producing selected brightness.Backlight liquid crystal display can be used in the equipment by drawing reference numeral 121 representatives, such as graphoscope (display on knee and computer monitor), televisor, video recorder, mobile communications device, hand-held device (being mobile phone, personal digital assistant (PDA)), automobile and aerial device display etc.

Display can also comprise other blooming 112 between brightness enhancement film and LCD panel 114.Described other blooming can comprise (for example) diffuser, reflecting polarizer or the second brightness enhancement film.As known in the art, other blooming can be between blooming 112 and the LCD panel 114 or between brightness enhancement film 111 and light guide sheet 118.In addition, turning film can be between light guide sheet and blooming.Can be that brightness enhancement film can be turning film for the another kind of mode of selecting.Turning film has the prism structure that forms at input surface usually, and input surface is arranged as with light guide sheet adjacent.Light leaves light guide sheet and propagates into output surface with glancing angle (usually less than 30 degree), shines on the prism structure at this.Light is by the first surface of prism structure refraction and by the reflection of the second surface of prism structure so that light be diverted on the direction that lens or turning film be directed to expectation (as substantially with the watching on the parallel direction of axle of display).

The combination that only consists of by 111 and 112 combinations that consist of or by they and the 3rd blooming can be in the optical film assembly as herein described any one.If introduce these additional bloomings as the bottom of brightness enhancement film, then the thickness of this bottom may be more much bigger than aforesaid thickness.

One preferred aspect in, the assembly that has been found that unpolarized micro-structural film or comprise this film has improved luminance brightness on the axle of some back lighting device.And find, in having the edge light type backlit display of minute surface backreflection sheet, be common from axle luminance brightness peak, particularly all the more so in having this display of wedge shape light guide sheet.

Blooming as herein described can comprise paradigmatic structure, and this paradigmatic structure contains the reaction product of organic composition, and described organic principle optionally comprises a plurality of nano particles (such as the nano particle through surface modification).Paradigmatic structure can be optical element or the optical articles that is made of bottom and optical layers.Bottom and optical layers can be formed by identical or different polymeric material.

Patent (U.S. Patent No. 5 such as Lu, 183,597) and the people's such as Lu patent (U.S. Patent No. 5,175,030) described in, goods (such as brightness enhancement film) with microstructure can prepare by the method that may further comprise the steps: (a) preparation polymerisable compound (that is, polymerisable compound of the present invention); (b) polymerisable compound is deposited on the die surface of micro-structural of master mold with the amount of just enough filling up the master mold cavity; (c) by between preformed bottom and master mold (wherein at least one is flexible), the blobs of described polymerisable compound being moved, come cavity filling; And (d) composition is solidified.Master mold can be metal (for example copper of nickel, nickel plating or brass) or can be such thermoplastic that it is stablized and preferably have can make the surface energy of removing neatly from master mold through the material of polymerization under polymerizing condition.One or more surfaces of counterdie optionally are coated with priming paint or processed, to promote the bonding of optical layers and bottom.

Suitable polymerization comprises solution polymerization process known in the art, suspension polymerization, emulsion polymerization and mass polymerization.Suitable method is included under the existence of radical initiator and heats, and shines with electromagnetic radiation (for example ultraviolet light or visible light) in the presence of light trigger.In polymerisable compound synthetic, usually use inhibitor (quinhydrones, 4-metoxyphenol and hindered amine nitroxide (hindered amine nitroxide) inhibitor for example, consumption is 50 to 1000ppm), in order to avoid in synthetic, transportation and storage process, make resin generation premature polymerization.Other inhibitor kind and/or consumption can use as known to those skilled in the art like that.Composition of the present invention can be preferably the polymerization by irradiation ultraviolet light in the presence of light trigger or visible light.

Polymerisable compound or organic principle wherein are preferably basically solvent-free polymerisable compound." essentially no solvent " refers to that solvent (such as the organic solvent) content in the polymerisable compound is lower than 5 % by weight, is lower than 4 % by weight, is lower than 3 % by weight, is lower than 2 % by weight, is lower than 1 % by weight, is lower than 0.5 % by weight.The content of solvent can be measured by the known method such as vapor-phase chromatography.Solvent is preferably less than 0.5 % by weight.

Organic principle can be solid or comprises solid constituent, and condition is that the fusing point of polymerisable compound is lower than coating temperature.Organic principle can be liquid at ambient temperature.

Preferably, the composition of organic principle is selected, so that organic principle has low viscosity, for example under 180 °F, be lower than 1000cps.Usually, the viscosity of organic principle of the present invention is lower than the viscosity of the organic principle in the composition that adopts before this substantially.The viscosity of organic principle of the present invention is lower than 1000cps, is usually less than 900cps.The viscosity of organic principle under coating temperature can be lower than 800cps, is lower than 450cps, is lower than 600cps or is lower than 500cps.In this article, (shear rate is up to 1000 seconds with the parallel-plate of 25mm to adopt the dynamic stress flow graph ^-1) measurement viscosity.In addition, the viscosity of organic principle of the present invention under coating temperature is generally at least 10cps, is more typically at least 50cps, even is more typically at least 100cps, is generally at least 200cps most.Coating temperature is generally environment temperature (namely 25 ℃) to 180 °F (82 ℃).Coating temperature can be lower than 170 °F (77 ℃), is lower than 160 °F (71 ℃), is lower than 150 °F (66 ℃), is lower than 140 °F (60 ℃), is lower than 130 °F (54 ℃) or is lower than 120 °F (49 ℃).

Polymerisable compound comprises one or more ethylenically unsaturated monomers.Polymerisable compound can comprise (methyl) acrylic acid modified polyurethane oligomer, (methyl) acrylic acid modified polyester oligomer, (methyl) acrylic acid modified phenolics oligomer, (methyl) acrylic acid modified acrylic acid oligomer, and composition thereof.Yet in some embodiments, organic principle does not contain urethane bonds, so this organic principle is made by the reaction product of the polymerisable compound that does not contain (methyl) acrylic acid modified polyurethane.The polymerisable compound that contains (methyl) acrylic acid modified polyurethane often has higher viscosity.

In some embodiments, polymerisable compound can contain at least a number-average molecular weight greater than the oligomeric ethylenically unsaturated monomers of 450g/ mole, and described oligomeric ethylenically unsaturated monomers and reactive diluent and/or crosslinking chemical are combined.In other embodiments, polymerisable compound can contain one or more ethylenically unsaturated monomers, and wherein organic phase does not contain number-average molecular weight greater than the oligomeric monomer of 450g/ mole.

For the embodiment of surface-modified nano particles that employing has enough polymerizable reactive groups, needn't necessarily use crosslinking chemical.In preferred embodiments, polymerisable compound and composition thereof only have acrylate-functional, therefore are substantially free of methacrylate functional.

Polymerisable compound as herein described comprises inorganic oxide particles (such as the inorganic oxide particles through surface modification).Select the size of this particle to avoid occuring significant visible light scattering.May expect to adopt the potpourri of multiple inorganic oxide particles, come optimizing optical performance or material property and the total cost of composition is reduced.The hybridized polymer that is formed by inorganic nanoparticles and organic resin is easy to obtain the permanance that only can not be obtained by conventional organic resin.Introduce the permanance that inorganic nanoparticles can improve the goods (such as brightness enhancement film) that form thus.

Do not have through giving the inorganic nanoparticles of this surface modification of its polymerizability although can effectively adopt, inorganic nanoparticles preferably passes through surface modification so that nano particle can with the organic principle polymerization.In paradigmatic structure, can be for so that the permanance of goods or optical element effectively strengthens and/or so that the amount that its refractive index effectively increases through the amount of (such as colloidal state) nano particle of surface modification.Colloid nano particle through surface modification as herein described can have many desirable characteristics, comprises (for example): the compatibility of nano particle and resin system, so that nano particle forms stable disperse state in resin system; Surface modification can make nano particle have the ability of reacting with resin system, so that compound substance is more durable; Join the nano particle of the suitable surface modification of process in the resin system to the less impact of viscosity generation of uncured composition.The combination of useful surface modifier is controlled before the curing and the performance of the composition after solidifying.Can improve optical property and the physical property of optical element through the nano particle of suitable surface modification, such as for example, improve the physical strength of resin, make the viscosity variation minimize, make simultaneously the solid addition of resin system to increase, and when the solid addition that makes resin system increases, also keep optical transparence.

The particle diameter that can be its primary particle diameter or association particle through the colloid nano particle of surface modification greater than 1nm less than the oxide particle of 100nm.Nano particle is preferably unassociated.Can measure nano particle based on transmission electron microscope method (TEM).Nano particle can comprise metal oxide, such as for example, and aluminium oxide, tin oxide, antimony oxide, silicon dioxide, zirconia, titania, its potpourri or its mixed oxide.Colloid nano particle through surface modification can be condensed basically fully.

The not silica containing fully nano particle of cohesion has the crystallinity (recording with the metal oxide particle that separates) greater than 55% usually, is preferably greater than 60%, more preferably greater than 70%.For example, crystallinity can be up to about 86% or larger.Crystallinity can be measured by the X-ray diffraction technology.The crystalline state nano particle (such as Zirconium oxide nano grain) of cohesion has high refractive index, and unbodied nano particle has lower refractive index usually.

The particle diameter of nano SiO 2 particle can be 5-75nm or 10-30nm or 20nm.In permanance goods or optical element, the amount of nano SiO 2 particle can be 10-60 % by weight or 10-40 % by weight.The silicon dioxide that is used for raw material of the present invention can be available from the Nalco Chemical company that is positioned at Illinois, America Naperville city, commodity are called " Nalco Collodial Silicas ", such as product 1040,1042,1050,1060,2327 and 2329.Suitable fumed silica comprises that (for example) can be called available from the commodity of DeGussa AG company (being positioned at German Hanau city) product of " Aerosil series OX-50 ", and production number is-130 ,-150 and-200 product.Fumed silica also can be available from the Cabot company that is positioned at Illinois, America Tuscola city (commodity be called " CAB-O-SPERSE 2095 ", " CAB-O-SPERSE A105 " and " CAB-O-SIL M5 ").

The particle diameter of Zirconium oxide nano grain can be 5-50nm or 5-15nm or 10nm.In permanance goods or optical element, the amount of Zirconium oxide nano grain can be 10-70 % by weight or 30-60 % by weight.The zirconia that is used for composition of the present invention and goods can and be positioned at the Buhler AG company (commodity are called " Buhler zirconia Z-WO sol ") in Switzerland Uzwil city available from Nalco Chemical company (commodity are called " Nalco OOSS008 ").Zirconium oxide nano grain also can such as U.S. Patent application No.11/027426 (submission on Dec 30th, 2004) and U.S. Patent No. 6,376, be prepared from described in 590.

The particle diameter of titania, antimony oxide, aluminium oxide, tin oxide and/or mixed-metal oxides nano particle or the particle diameter of association particle can be 5-50nm or 5-15nm or 10nm.In permanance goods or optical element, the amount of titania, antimony oxide, aluminium oxide, tin oxide and/or mixed-metal oxides nano particle can be 10-70 % by weight or 30-60 % by weight.The mixed-metal oxides that is used for raw material of the present invention can be available from the Catalysts ﹠amp that is positioned at the Japan Kawasaki City; Chemical Industries Co., Ltd. (commodity are called " Optolake 3 ").

Nano-scale particle is carried out surface treatment can make it form stable disperse state in fluoropolymer resin.Preferably, come stable nanoparticles by surface treatment, so that particle is dispersed in the polymerizing resin well, and produce the basically composition of homogeneous.In addition, can be with at least a portion modifying surface of surface conditioning agent to nano particle, so that can be in solidification process and polymerizing resin copolymerization or reaction by stable particle.

Preferably with surface conditioning agent nano particle of the present invention is processed.Usually, surface conditioning agent has: the first end group, and it will be connected with particle surface (this is by covalent bond, ionic link or by strong physisorption realization); With the second end group, itself so that particle and resin have compatibility and/or in solidification process with resin reaction.The example of surface conditioning agent comprises alcohols, amine, carboxylic acids, sulphonic acids, phosphonic acid based, silane and titanate esters.Preferred treating agent type is partly determined by the chemical property of metal oxide surface.For silicon dioxide and other siliceous filler, preferred silane.For metal oxide (such as zirconia), then preferred silane and carboxylic acids.Can particle with carry out immediately surface modification after monomer mixes, perhaps after the two mixes a period of time, carry out again surface modification.In the situation of silane, preferably before being attached in the resin, make the surface reaction of silane and particle surface or nano particle to particle or nano particle.The demand of surface modifier depends on several factors, such as particle diameter, grain type, modifier molecules amount and modifier type.Usually, preferably, the modifier of approximate individual layer is connected with particle surface.Required method of attachment or reaction conditions also depend on employed surface modifier.For silane, preferably about 1-24 hour high temperature surface treatment under acidity or alkali condition.Surface conditioning agent such as carboxylic acid can not need high temperature or long-time.

The representative embodiment that is suitable for the surface conditioning agent of composition of the present invention comprises such as following compound, for example isooctyltrimethoxysi,ane, N-(3-triethoxysilylpropyltetrasulfide) carbamic acid methoxyethoxyethoxy ethyl ester, N-(3-triethoxysilylpropyltetrasulfide) carbamic acid methoxyethoxyethoxy ethyl ester, 3-(methacryloxy) propyl trimethoxy silicane, 3-acryloxy propyl trimethoxy silicane, 3-(methacryloxy) propyl-triethoxysilicane, 3-(methacryloxy) propyl group methyl dimethoxysilane, 3-(acryloxy propyl group) methyl dimethoxysilane, 3-(methacryloxy) propyl-dimethyl Ethoxysilane, 3-(methacryloxy) propyl-dimethyl Ethoxysilane, vinyl-dimethyl base oxethyl silane, phenyltrimethoxysila,e, the n-octyl trimethoxy silane, dodecyltrimethoxysilane, the octadecyl trimethoxy silane, propyl trimethoxy silicane, the hexyl trimethoxy silane, vinyl methyl diacetoxy silane, the vinyl methyldiethoxysilane, vinyltriacetoxy silane, vinyltriethoxysilane, vinyl silane triisopropoxide, vinyltrimethoxy silane, vinyl triple phenoxyl silane, vinyl three tert-butoxy silane, vinyl three isobutoxy silane, vinyltriisopropenyloxysilane, vinyl three (2-methoxy ethoxy) silane, the styryl ethyl trimethoxy silane, mercaptopropyl trimethoxysilane, the 3-glycidoxypropyltrimewasxysilane, acrylic acid, methacrylic acid, oleic acid, stearic acid, dodecylic acid, 2-[2-(2-methoxy ethoxy) ethoxy] acetic acid (MEEAA), β-acryloxypropionic acid (BCEA), 2-(2-methoxy ethoxy) acetic acid, the methoxybenzene guanidine-acetic acid, and composition thereof.In addition, having been found that can be suitable especially available from silane surface modified dose (commodity are called " Silquest A1230 ") of the sale monopoly of the Crompton-OSI Specialties company that is positioned at South Charleston city, w.va..

Can realize the particle in the colloidal dispersion is carried out by many methods the operation of surface modification.This operation relates to the potpourri of inorganic dispersant and surface modifier.Optionally be, at this moment can add cosolvent, such as for example, 1-methoxy-2-propanol, ethanol, isopropyl alcohol, ethylene glycol, DMA and 1-Methyl-2-Pyrrolidone.Cosolvent can strengthen surface modifier and by the dissolubility of the particle of surface modification.The potpourri that comprises inorganic sol and surface modifier is reacted under the condition that is stirring under room temperature or the high temperature or do not stirring.In a preferred method, potpourri can about 24 hours of about 85 ℃ of lower reactions, obtain the colloidal sol through surface modification at last.In a preferred method, when metal oxide was carried out surface modification, preferably, the surface treatment of metal oxide can comprise acidic molecular is adsorbed on step on the particle surface.The surface modification of heavy metallic oxide can at room temperature be carried out.

Can be under acid condition or alkali condition with silane to ZrO ₂Carry out surface modification.In a preferred scheme, preferably under acid condition, silane is heated suitable a period of time.At this moment, dispersion and ammoniacal liquor (or other alkali) are mixed.The method can be from ZrO ₂The surface reaction of removing the acid balance ion and can remove these acid balance ions and silane.In a preferred method, particle is precipitated from dispersion and from liquid phase, separate.

Then can will be attached in the curable resin through the particle of surface modification by several different methods.A preferred aspect is to adopt the solvent exchange method, wherein, resin is joined in the colloidal sol of surface modification, removes by evaporation subsequently and anhydrates and cosolvent (if having used cosolvent), thereby particle is dispersed in the polymerizing resin.Can finish evaporation step by (for example) distillation, rotary evaporation or oven dry.

In one aspect of the method, can use and the particle of the immiscible solvent extraction of water through surface modification, carry out subsequently solvent exchange (if needing like this).

Comprise for the another kind of method for selecting that will be attached to through the nano particle of surface modification polymerizing resin: modified particles is dried to powder, adds subsequently the resin material of discrete particles.Drying steps in this method can be finished by the conventional method (such as oven dry or spray drying) that is suitable for this system.

Can use the combination of surface modifier, wherein at least a reagent have can with the functional group of gel-type resin copolymerization.The combination of surface modifier can produce lower viscosity.For example, polymer-based group can be the ethylenic unsaturated group or is easy to the ring-type functional group of ring-opening polymerization.The unsaturated polymerization group of ethylenic can be (for example) acrylate group or methacrylate based group or vinyl groups.Heteroatoms (such as oxygen, sulphur or nitrogen) is contained usually in the ring-type functional group that is easy to ring-opening polymerization, and is preferably oxygen containing three-membered ring (such as epoxy radicals).

The preferred compositions of surface modifier comprises: the first surface modifier and be different from the second modifier of the first modifier at least, wherein said the first surface modifier have can with the functional group of gel-type resin (organic principle in the gel-type resin) copolymerization.Optionally be, the second modifier can with the organic principle copolymerization of polymerisable compound.The second modifier can have low refractive index (namely less than 1.52 or less than 1.50).Preferably, the second modifier for optionally can with the modifier that contains polyoxygenated alkene of the organic principle copolymerization of polymerisable compound.

There is multiple ethylenically unsaturated monomers to can be used in the organic principle of polymerisable compound.

Suitable oligomeric (methyl) acrylic acid modified aromatic epoxies oligomer can be available from Sartomer company (commodity are called " CN104 ", " CN116 ", " CN120 ", " CN121 " and " CN136 "), Cognis company (commodity are called " Photomer 3016 ") and UCB. S.A.'s (commodity are called " 3200 ", " 3201 ", " 3211 " and " 3212 ").

Suitable polyurethane (methyl) acrylate can available from: (commodity are called " CN965 " in Sartomer company, " CN968 ", " CN981 ", " CN983 ", " CN984 ", " CN972 " and " CN978 "), (commodity are called " Photomer 6210 " in Cognis company, " Photomer 6217 ", " Photomer 6230 ", " Photomer 6623 ", " Photomer 6891 " and " Photomer6892 ") and UCB. S.A. (BE) Bruxelles Belgium (commodity are called " Ebecryl 1290 ", " Ebecryl 2001 " and " Ebecryl 4842 ").

Suitable polyester (methyl) acrylate can be available from Sartomer company (commodity are called " CN292 "), (commodity are called " Photomer 5010 " in Cognis company, " Photomer 5429 ", " Photomer 5430 ", " Photomer 5432 ", " Photomer 5662 ", " Photomer 5806 " and " Photomer 5920 ") and UCB. S.A. (BE) Bruxelles Belgium (commodity are called " Ebecryl 80 ", " Ebecryl81 ", " Ebecryl 83 ", " Ebecryl 450 ", " Ebecryl 524 ", " Ebecryl 525 ", " Ebecryl 585 ", " Ebecryl 588 ", " Ebecryl 810 " and " Ebecryl 2047 ").

Suitable phenolics (methyl) acrylate can be available from Sartomer company (commodity are called " SR601 " and " SR602 ") and Cognis company (commodity are called " Photomer 4025 " and " Photomer 4028 ").

Suitable (methyl) acrylic acid modified acrylic acid oligomer also is commercially available, perhaps can make by method as known in the art.

Polymerisable compound can comprise the first monomer, and this first monomer has the major part that is represented by following formula I or II:

In the separately situation of structure I and II, R1 is hydrogen or methyl independently of one another.R2 is hydrogen or bromine independently of one another.Z is-C (CH independently of one another ₃) ₂-,-CH ₂-,-C (O)-,-S-,-S (O)-or-S (O) ₂-; And Q is O or S independently of one another.Usually, the R1 group is identical.Usually, the R2 group also is mutually the same.In structure I I, L is linking group.L can comprise side chain C independently ₂-C ₁₂Alkyl or straight chain C ₂-C ₁₂Alkyl; The carbochain of this alkyl is optionally replaced by one or more oxygen bases.In addition, the carbon atom of this alkyl is optionally replaced by one or more hydroxyls.For example, L can be-CH ₂CH (OH) CH ₂-.Usually, described linking group is identical.Preferably, described alkyl comprises at the most 8 carbon atoms, more preferably comprises at the most 6 carbon atoms.Also can adopt the potpourri of I and II.

The first monomer can be synthesize or buy.Refer to that at this used term " major part " described ad hoc structure accounts at least 60 % by weight to 70 % by weight of this monomer.Usually be understood that other reaction product also can exist as the accessory substance that synthesizes this class monomer usually.

The first monomer is preferably tetrabromobisphenol A diglycidyl ether and acrylic acid reaction product.The first monomer can derive from the UCB. S.A. (BE) Bruxelles Belgium that is positioned at Georgia State, USA Smyrna city, and commodity are called " RDX-51027 ".The major part that this material comprises is: 2-acrylic acid (1-methyl ethylidene) two [(2,6-, two bromo-4,1-phenylene) oxygen base (2-hydroxyl-3,1-glyceryl)] ester.

Although can also suitably adopt the potpourri of this class the first monomer, for the ease of producing, under the prerequisite of the brightness enhancement film that still can obtain to have suitable gain, the kind of the different monomers of employing is the least possible to be preferred.In order to satisfy this target, preferably, brightness enhancement film comprises the single a kind of reaction product in above-mentioned these first monomers (particularly tetrabromobisphenol A diglycidyl ether and acrylic acid reaction product).

Polymerisable compound can comprise at least a (methyl) acrylic acid modified aromatic epoxies oligomer.It is commercially available that multiple (methyl) acrylic acid modified aromatic epoxies oligomer is arranged.For example, (methyl) acrylic acid modified aromatic epoxy resin (being described to modified epoxy acrylic ester) can derive from the Sartomer company that is positioned at Pennsylvania, America Exton city, and commodity are called " CN118 ", " CN115 " and " CN112C60 ".(methyl) acrylic acid modified aromatic epoxies oligomer (being described to epoxy acrylate oligomer) can derive from Sartomer company, and commodity are called " CN2204 ".Furthermore, (methyl) acrylic acid modified aromatic epoxies oligomer (being described to wherein to be mixed with the epoxy novolac acrylate (epoxy novolak acrylate) of 40% trimethylolpropane triacrylate) can derive from Sartomer company, and commodity are called " CN112C60 ".

In some embodiments, all suc as formula represented those aromatic epoxies acrylate of II all derived from bisphenol-A.Yet in other embodiments, the aromatic epoxies acrylate can be derived from the monomer that is different from bisphenol-A.

The polymerisable compound composition can comprise aromatic epoxies acrylate, at least a crosslinking chemical, at least a reactive diluent and at least a other ethylenically unsaturated monomers.Can be for the another kind of mode of selecting, the organic principle of polymerisable compound can only comprise aromatic epoxies acrylate and crosslinking chemical or aromatic epoxies acrylate and reactive diluent, and wherein, described each mode all contains light trigger.If adopt the aromatic epoxies acrylate in polymerisable compound, then the aromatic epoxies acrylate can be simple function, and condition is that polymerisable compound comprises at least a composition with at least two ethylenic unsaturated polymerizable groups.The aromatic epoxies acrylate can have three or more (methyl) acrylate group.Aromatic epoxies (methyl) acrylate can be by halo, and its refractive index is usually greater than 1.56.In other side, the refractive index of aromatic epoxies (methyl) acrylate can be less than 1.56.The viscosity of aromatic epoxies (methyl) acrylate can be greater than 2150cps under 65 ℃.Can adopt aromatic epoxies (methyl) acrylate that is lower than 30 % by weight, for example itself and reactive diluent be combined.In other embodiments, the viscosity of aromatic epoxies (methyl) acrylate can be less than 2150cps under 65 ℃, and can be without thinning agent.Can adopt aromatic epoxies (methyl) acrylate greater than 30 % by weight in the organic principle.

In polymerisable compound, the amount of the first monomer and/or aromatic epoxies (methyl) acrylate is preferably at least about 15 % by weight (for example, 20 % by weight, 30 % by weight, 35 % by weight, 40 % by weight, 45 % by weight and 50 % by weight and any amount therebetween).Usually, the amount of the first monomer and/or aromatic epoxies (methyl) acrylate is no more than about 60 % by weight.

Polymerisable compound of the present invention also optionally comprises at least a crosslinking chemical except comprising the first monomer and/or aromatic epoxies (methyl) acrylate, and is preferably and only comprises a kind of crosslinking chemical.Can be with polyfunctional monomer as crosslinking chemical, to improve the glass transition temperature of the polymkeric substance that is polymerized by polymerisable compound.Glass transition temperature can be measured by methods known in the art (for example differential scanning calorimetry (DSC), modulated DSC or dynamic mechanical analysis method).Preferably, make the full cross-linked so that glass transition temperature of polymerisable compound greater than 45 ℃.

Crosslinking chemical has at least two (methyl) acrylate-functional groups, preferably has at least three (methyl) acrylate-functional groups.Suitable crosslinking chemical comprises (for example) hexanediol diacrylate (HDDA), three (methyl) acrylic acid pentaerythritol ester, four (methyl) acrylic acid pentaerythritol ester, trimethylolpropane tris (methyl) acrylate, five (methyl) acrylic acid dipentaerythritol ester, six (methyl) acrylic acid dipentaerythritol ester, ethoxylated trimethylolpropane three (methyl) acrylate, three (methyl) acrylic acid glyceride, three (methyl) acrylic acid pentaerythritol propoxylate ester and two (trimethylolpropane) four (methyl) acrylate.Can adopt the combination of any crosslinking chemical or multiple crosslinking chemical.

Crosslinking chemical is preferably with the amount at least about 2 % by weight and is present in the polymerisable compound.Usually, the amount of crosslinking chemical is no more than about 25 % by weight.The amount of crosslinking chemical can be that about 5 % by weight are to any value between about 15 % by weight.

Preferred crosslinking chemical comprise hexanediol diacrylate (HDDA), three (methyl) acrylic acid pentaerythritol ester, four (methyl) acrylic acid pentaerythritol ester, five (methyl) acrylic acid dipentaerythritol ester, trimethylolpropane tris (methyl) acrylate, two (trimethylolpropane) four (methyl) acrylate, and composition thereof.Pentaerythritol triacrylate (PETA) and five acrylic acid dipentaerythritol ester can be available from the Sartomer companies (trade name is respectively " SR444 " and " SR399LV ") that are positioned at Pennsylvania, America Exton city, be positioned at Osaka Organic Chemical Industry Co., Ltd.'s (commodity are called " Viscoat #300 ") of Osaka City, Janpan, be positioned at Toagosei Co., Ltd's (commodity are called " Aronix M-305 ") in Tokyo city and be positioned at Changxing chemical inc (commodity are called " Etermer 235 ") of Kaohsiung City, Taiwan Province.Trimethylolpropane triacrylate (TMPTA) and two (trimethylolpropane) tetraacrylate (di-TMPTA) can be available from Sartomer company (commodity be called " SR351 " and " SR355 ").TMPTA also can be available from Toagosei Co., Ltd (commodity be called " Aronix M-309 ").In addition, ethoxylated trimethylolpropane triacrylate and ethoxylation pentaerythritol triacrylate can be available from Sartomer company (trade name be respectively " SR454 " and " SR494 ").

In each embodiment as herein described, polymerizable resin composition optionally but be the reactive diluent that preferably comprises up to about 35 % by weight (for example integer % by weight between the 1-35), with the viscosity that reduces polymerizable resin composition and the processing characteristics of improving said composition.Reactive diluent is single ethylenically unsaturated monomers, replace such as (methyl) acrylate or N-or N, (methyl) acrylamide (particularly acrylamide) of the dibasic monomeric form of N-.These reactive diluents comprise N-alkyl acrylamide and N, and N-dialkyl group acrylamide particularly wherein contains C _1-4Those of alkyl.Its example is NIPA, N tert butyl acrylamide, N,N-DMAA, N, N-diethyl acrylamide, NVP and N-caprolactam.

The refractive index of preferred thinning agent can be greater than 1.50 (as greater than 1.55).This reactive diluent can be by (such as the non-bromo) of halo or non-halo.The number-average molecular weight of suitable monomer is not more than the 450g/ mole usually, comprises

Suitable reactive diluent for example comprises (methyl) phenoxyethyl acrylate, (methyl) acrylic acid phenoxy group-2-methyl ethyl ester, (methyl) acrylic acid phenoxy group ethoxy ethyl ester, (methyl) acrylic acid 3-hydroxyl-2-hydroxypropyl acrylate, (methyl) acrylic acid benzene methyl, (methyl) acrylic acid 4-(1-methyl isophthalic acid-phenethyl) ethyl phenoxy, acrylic acid benzene sulphur ethyl ester, acrylic acid 2-naphthalene sulphur ethyl ester; Acrylic acid 1-naphthalene sulphur ethyl ester; Acrylic acid 2,4,6-tribromophenoxy ethyl ester; Acrylic acid 2,4-dibromo-phenoxy base ethyl ester; Acrylic acid 2-bromine phenoxy ethyl; Acrylic acid 1-naphthalene 2-ethoxyethyl acetate; Acrylic acid 2-naphthalene 2-ethoxyethyl acetate; Acrylic acid phenoxy group 2-methyl ethyl ester; Acrylic acid phenoxy group ethoxy ethyl ester; Acrylic acid 3-phenoxy group-2-hydroxy propyl ester; Acrylic acid 2-phenyl phenoxy ethyl; Acrylic acid 4-phenyl phenoxy ethyl; Acrylic acid 2,4-two bromo-6-secondary butyl phenenyl esters; Acrylic acid 2,4-two bromo-6-isopropyl phenyl esters; Benzyl acrylate; Phenyl acrylate; Acrylic acid 2,4, the 6-tribromophenyl.Also can adopt the high monomer of other refractive index, such as acrylic acid pentabromo-benzyl ester and acrylic acid pentabromo-phenyl ester.

It is preferred only comprising single a kind of thinning agent, so that produce.Preferred thinning agent is (methyl) phenoxyethyl acrylate, particularly phenoxyethyl acrylate (PEA).Phenoxyethyl acrylate can available from more than one place, comprise Sartomer company (commodity are called " SR339 "), Changxing chemical inc (commodity are called " Etermer 210 ") and Toagosei Co., Ltd's (commodity are called " TO-1166 ").The acrylic acid benzene methyl can be available from the AlfaAeser company that is positioned at Massachusetts, United States Ward Hill city.

The optional monomer that refractive index is high can be by (for example by bromo) of halo.A kind of exemplary high optional monomer of refractive index is (methyl) acrylic acid 2,4,6-tribromophenoxy ethyl ester (can be available from the Di-ichi Kogyo Seiyaku Co., Ltd. that is positioned at kyoto, Japan, commodity are called " BR-31 ").

In polymerisable compound, the amount of this optional monomer can be at least about 5 % by weight.The total amount of optional monomer accounts at the most about 50 % by weight of polymerisable compound usually.The total amount of the optional monomer that in some embodiments, refractive index is high is that about 30 % by weight are to about 45 % by weight (comprising the integer % by weight between the 30-45).

The polymerisable compound of UV-curable comprises at least a light trigger.In brightness enhancement film of the present invention, can use the potpourri of single a kind of light trigger or use light trigger.Usually, light trigger at least part of solvable (for example, part is solvable under the processing temperature of resin), and basically colourless after polymerization.Light trigger can be coloured (such as yellow), and it is colourless that to be this light trigger become after through the UV light source irradiation condition basically.

Suitable light trigger comprises monoacyl phosphine oxide and two acylphosphine oxide.Commercially available monoacyl phosphine oxide or two acylphosphine oxide light trigger comprise: can be available from the TMDPO of BASF AG's (being positioned at North Carolina, USA Charlotte city), and commodity are called " Lucirin TPO "; Also can be available from the ethyl-2,4 of BASF AG, 6-trimethylbenzoyl phenyl phosphinate (ethyl-2,4,6-trimethylbenzoylphenyl phosphinate), commodity are called " Lucirin TPO-L "; And can be available from two (2,4,6-trimethylbenzoyl)-phenyl phosphine oxides of Ciba company, commodity are called " Irgacure 819 ".Other suitable light trigger comprises can be available from the light trigger of Ciba company available from the 2-hydroxy-2-methyl of Ciba company-1-phenyl-third-1-ketone (commodity are called " Darocur 1173 ") and other, and commodity are called " Darocur 4265 ", " Irgacure 651 ", " Irgacure 1800 ", " Irgacure369 ", " Irgacure 1700 " and " Irgacure 907 ".

Can about 0.1 % by weight to the concentration of about 10 % by weight use light trigger.More preferably, use light trigger with about 0.5 % by weight to the concentration of about 5 % by weight.It is normally disadvantageous that concentration surpasses 5 % by weight, because can make the brightness enhancement film flavescence like this.As can being determined by those of ordinary skills, also can suitably use other one or more light triggers.

In polymerisable compound, optionally comprise surfactant (for example fluorochemical surfactant and silicon-type surfactant), to reduce surface tension, to improve wetting state so that coating is more smooth, holiday is still less waited.

Polymerisable compound can solidify under energy, and set time, length was preferably less than 5 minutes, and for example the situation for the brightness enhancement film of 75 micron thickness is like this.Preferably, polymerisable compound is full cross-linked, so that glass transition temperature is usually above 45 ℃.Glass transition temperature can be measured by method as known in the art (for example differential scanning calorimetry (DSC), modulated DSC or dynamic mechanical analysis method).Polymerisable compound can carry out polymerization by the radical polymerization of routine.

Polymerisable compound as herein described can be favourable for other optical material (optical goods (for example, film) that for example have microstructure).Exemplary optical material comprises: optical goods, and such as lens blooming, LED encapsulant, without support of lens, destructuring film (such as flat film (flat film)), multilayer film, reflecting plate, optical fibers or optical tube and flexible mold (as be suitable for producing plasma display with the flexible mold of barrier rib) etc.

The term that uses in this instructions is described as follows:

" refractive index " or " refractive index " refers to the absolute index of refraction of material (for example, monomer), and its implication is electromagnetic radiation speed in a vacuum and the ratio of the speed of this radiation in the sort of material.Can adopt known method and usually use Abbe refractometer (for example, can available from the Fisher Instruments company that is positioned at Pennsylvania, America Pittsburgh city) to measure refractive index at visible region.Usually be understood that the refractometry value can change within the specific limits along with the variation of instrument.

" (methyl) acrylate " both referred to acrylate compounds, also nail base acrylate compounds.

" polymerisable compound " refers to comprise total composition of organic principle (it comprises at least a polymerisable monomer) and optional inorganic nanoparticles.

" organic principle " refers to all components except inorganic nanoparticles and nano grain surface modifier in the composition.For the embodiment that polymerisable compound does not wherein contain inorganic nanoparticles, organic principle is identical with polymerisable compound.

Term " nano particle " in this article refers to mean grain size less than the particle (primary granule or association primary granule together) of about 100nm.

" through the colloid nano particle of surface modification " refers to that the surface of each nano particle passes through modification, so that this nano particle can form stable disperse state.

" gathering " refers to the strong association between the primary granule, and chemical bonding can occur these primary granules each other.Aggregation is difficult to separately be formed less particle.

" reunion " refers to the weak association between the primary granule, and these primary granules can keep together by electric charge or polarity, and can separately be formed less individuality.

" primary particle diameter " refers to the mean diameter of individual particle (non-aggregation, non-aggregate).

The numerical range that is represented by end points comprise all numerals in this scope (as, reach level off to the levels of precision of numerical value end points).For example, greater than 1.78 and comprise 1.79,1.80,1.81,1.82 etc. less than 2.05 relative gain, be 2.04 to the maximum.

The every a patent that this paper quotes is all incorporated this paper in full with way of reference.

Following example further illustrates advantage of the present invention, but concrete material and consumption and other condition and the details narrated in these examples should not be considered to excessive restriction of the present invention.Except as otherwise noted, all percentage used herein and ratio are all come in weight.

Embodiment

Refractive index uses 6208 type refractometers of Fischer Scientific company to measure the refractive index of polymerisable compound.

The gain test method

Use derives from the SpectraScan with MS-75 lens of the Photo Research company that is positioned at California, USA Chatsworth city ^TMPR-650 spectrophotometer (SpectraColorimeter) is measured the optical property of film.Film is placed on the hollow light box of diffuse transmission.The diffuse transmission of light box and diffuse reflection can be described as lambertian pattern (Lambertian).This light box is six hollow cube, and is made by the thick diffusion PTFE plate of about 6mm, and the size of this light box is about 12.5cm * 12.5cm * 11.5cm (L * W * H).Select the one side of this light box as sample surfaces.The diffuse reflectance that records at the sample surfaces of this hollow light box is about 0.83 (average out to is about 83% on the 400-700nm wavelength coverage, and measuring method is as described below).In the gain process of the test, the circular hole of this light box by about 1cm of (described bottom is relative with sample surfaces) bottom the case throw light on internally (internally light being directed to sample surfaces).Use stable band incandescent light sources that this illumination is provided, wherein this light source and the fibre bundle that is used for guiding light (derive from be positioned at Massachusetts, United States Marlborough city be connected with New York, United States Auburn city the Fostec DCR-II with the fibre bundle prolongation of diameter 1cm of Schott-Fostec LLC company) are connected.The linear absorption polaroid (for example Melles Griot 03FPG 007) of standard is placed between sales kit (SK) and the camera.Camera focuses on the sample surfaces of the light box at the about 34cm of camera lens place, and absorptive polarizer is arranged in from the distance of the about 2.5cm of camera lens.The luminance brightness that does not have to record in the situation of sample film illuminated light box in that polaroid is arranged is＞150cd/m ²When sample thin film is placed (sample thin film contacts light box usually) abreast with the sample surfaces of described case, impinge perpendicularly on the sample luminance brightness on the plane of sample surfaces of described case with the PR-650 measurement.By with this sample luminance brightness with recently calculate mutually relative gain from the measured luminance brightness of independent light box in an identical manner.All measurements are all carried out in the darkroom, to remove source of stray light.In addition, when the relative gain of the film assembly that comprises reflecting polarizer is tested, the light transmission shaft of this reflecting polarizer is aimed at the light transmission shaft of the absorptive polarizer of pilot system.Have that the relative gain record value of the film of prism-shaped microstructure normally obtains under the following conditions: vertically arrange with prismatic groove in the hithermost film of absorptive polarizer and the light transmission shaft of this absorptive polarizer.

The integrating sphere that scribbles Spectralon of use 15.25cm (6 inches) diameter, stable broadband halogen light source and the power supply (all these is provided by Labsphere company (being positioned at Sutton city, New Hampshire)) of this light source, the diffuse reflectance of measurement light box.This integrating sphere has three openings: an opening is used for input light (diameter is 2.5cm); Opening 90 degree on the direction of the second axle, as detector mouth (diameter is 2.5cm); The 3rd opening 90 degree on the 3rd axle (namely with the first two axle all vertical axle) direction, as sample port (diameter is 5cm).PR-650 spectrophotometer (with above-mentioned identical) is focused on the detector mouth of distance of about 38cm.Use derives from the calibration reflectance standard (SRT-99-050) of about 99% diffuse reflectance of having of Labsphere company, the reflection efficiency of calculated product bulb separation.This standard film is calibrated by Labsphere company, and can inquire about American National Standard standard (NIST standard (SRS-99-020-REFL-51)).The reflection efficiency of following calculated product bulb separation:

Spheroid brightness ratio=1/ (1-R _Ball* R _Standard)

In this case, the spheroid brightness ratio is at the measured luminance brightness of detector mouth ratio in the measured luminance brightness of detector mouth when not having sample to cover sample port when covering sample port with reference sample.Know the reflectivity (R of this brightness ratio and calibration standard sheet _Standard), then can calculate the reflection efficiency R of integrating sphere _BallThen, similarly re-using the reflectivity that this numerical value comes working sample in the equation, in this case, the PTFE light box:

Spheroid brightness ratio=1/ (1-R _Ball* R _Sample)

At this moment, measured spheroid brightness ratio is at the ratio of the measured luminance brightness of detector mouth measured luminance brightness when not having sample when sample places sample port.Because R _BallFrom above-mentioned test, learn, so can calculate R _SampleWavelength every 4nm calculates the primary event rate, and records these reflectivity at the mean value of 400-700nm wavelength coverage.

ZrO ₂ Colloidal sol

Prepare ZrO according to the method described in the U.S. Patent application No.11/079832 that submits on March 14th, 2005 ₂Colloidal sol, this patented claim have required the right of priority at the U.S. Patent application No.11/078468 of submission on March 11st, 2005.Described in U.S. Patent application No.11/079832 and 11/078468, estimate resulting ZrO by Photon Correlation Spectroscopy (PCS), X-ray diffraction method and thermogravimetry ₂Colloidal sol.The ZrO that is used for example ₂Colloidal sol has the performance of following ranges:

Polymerizable resin composition 1

With ZrO ₂Colloidal sol (100.0g), methoxypropanol (100.0g), derive from the BCEA (2.50g) of the Cytec Surface Specialties company that is positioned at Georgia State, USA Smyrna city, deriving from 2-[2-(2-methoxy ethoxy) ethoxy of the Sigma-Aldrich company that is positioned at Wisconsin, USA Milwaukee city] acetic acid (" MEEAA ") is (5.23g), the blend (20.78g) of 50/50 percentage by weight of acrylic acid benzene sulphur ethyl ester (deriving from " PTEA " of Bimax company) and BR-31, and 5% solution (0.1g) that derives from " Prostab5198 " of Ciba Giegy company joins in the 500mL round-bottomed flask.Except anhydrating and alcohol, the refractive index of the preparation that so obtains before curing is 1.6855, and said preparation comprises 57.5% ZrO by rotary evaporation ₂

Polymerizable resin composition 2

The polymerisable compound 1 of 10.03g and the Lucirin TPO-L of 0.04g are joined in the amber vial of 25mL.This bottle placed heat on the roller and mix, until sample reaches homogeneous.The refractive index of sample before curing through mixing is 1.6835.

Polymerizable resin composition 3

The potpourri of the PTEA/BR-31 of 50/50 percentage by weight of the polymerizable resin composition 1 of 10.05g and 2.39g is joined in the amber vial of 25mL.Next, the Lucirin TPO-L that adds 0.07g in this bottle.Then, just this bottle places and heats on the roller and mix, until sample reaches homogeneous.The refractive index of sample before curing through mixing is 1.6425.

Polymerizable resin composition 4

The potpourri of the PTEA/BR-31 of 50/50 percentage by weight of the polymerizable resin composition 1 of 10.07g and 6.32g is joined in the amber vial of 25mL.Next, the Lucirin TPO-L that adds 0.11g in this bottle.Then, just this bottle places and heats on the roller and mix, until sample reaches homogeneous.The refractive index of sample before curing through mixing is 1.617.

Polymerizable resin composition 5

With ZrO ₂The aqueous solution (0.12g) of 50/50 the potpourri (29.78pbw) of colloidal sol (100.00 weight portions (pbw)), MEEAA (4.44pbw), BCEA (2.13pbw), 1-methoxy-2-propanol (115pbw), SR-339/BR31 and 5 % by weight of Prostab 5198 joins in the round-bottomed flask.Remove alcohol and water by vacuum distillation, the resin that so obtains contains the zirconia of 53.3 % by weight of having an appointment, and the refractive index of described resin before curing is 1.6525.Add Lucirin TPO-L to this potpourri, obtain comprising the composition of the Lucirin TPO-L of 0.47 % by weight.

Polymerizable resin composition 6

The potpourri of the phenoxyethyl acrylate (derive from Sartomer company, commodity are called SR 339) of 50/50 percentage by weight of the polymerizable resin composition 5 of 10.06g and 2.72g/BR-31 is joined in the amber vial of 25mL.Next, the Lucirin TPO-L that adds 0.02g in this bottle.Then, just this bottle places and heats on the roller and mix, until sample reaches homogeneous.The refractive index of sample before curing through mixing is 1.617.

Polymerizable resin composition 7

The potpourri of the SR 339/BR-31 of 50/50 percentage by weight of the polymerizable resin composition 5 of 10.18g and 6.8g is joined in the amber vial of 25mL.Next, the Lucirin TPO-L that adds 0.02g in this bottle.Then just this bottle places and heats on the roller and mix, until sample reaches homogeneous.The refractive index of sample before curing through mixing is 1.597.

Polymerizable resin composition 8 (contrast)

US 6,355, the example 1 in 754 the table 1.(weight ratio is the Darocure 1173 of the RDX51027/EB 220/BR31/PEA/FC430 and 1 (pph) of 30/20/37.5/12.5/0.3).The refractive index of this resin before curing is 1.562.

Polymerizable resin composition 9

The potpourri of the SR 339/BR-31 of 50/50 percentage by weight of the polymerizable resin composition 5 of 50.5g and 3.15g is joined in the amber vial of 25mL.Then just this bottle places and heats on the roller and mix, until sample reaches homogeneous.The refractive index of sample before curing through mixing is 1.640.

Polymerizable resin composition 10

The potpourri of the SR 339/BR-31 of 50/50 percentage by weight of the polymerizable resin composition 5 of 50.25g and 6.12g is joined in the amber vial of 25mL.Then just this bottle places and heats on the roller and mix, until sample reaches homogeneous.The refractive index of sample before curing through mixing is 1.633.

Polymerizable resin composition 11

The potpourri of the SR 339/BR-31 of 50/50 percentage by weight of the polymerizable resin composition 5 of 50.42g and 9.27g is joined in the amber vial of 25mL.Then just this bottle places and heats on the roller and mix, until sample reaches homogeneous.The refractive index of sample before curing through mixing is 1.623.

Every kind of resin combination all is prepared into multiple different microstructured optical films and optical film assembly.Table 1-9 has hereinafter recorded described multiple different film and the relative gain value of assembly.

Film preparation A-is unpolarized prism-shaped microstructured optical films basically

Place 8 inches * 11 inches metal mothers on the heating plate and be heated to 140 °F, this metal mother is spaced apart 90 degree prisms 50 microns, that arrange by line style by nominal pitch and consists of, and the geometric configuration pattern of the prism that has on described prism by the line style arrangement and the Vikuiti BEF II (can available from the 3M company that is positioned at St.Paul city, Minn.) is similar.Use disposable transfer pipet that 4ml polymerizing resin blobs (as listed in the table) is applied on the master tooling.Then, be that 500 PET places on resin blobs and the master tooling with the specification that derives from the MELINEX 623 of Dupont Teijn Film Co., Ltd..The PET film is oriented so that the described prism of arranging by line style and the high-gain axle near normal of film are orientated (90 degree+/-20 are spent).Then make master tooling, resin and PET under enough acting forces, pass through 160 °F heating nip rolls, in order to make resin fill up master tooling fully, remove simultaneously any entrained air.Then make the described master tooling that is filled be exposed to " D type lamp " and (derive from the Fusion UV Systems company that is positioned at Maryland, USA Gaithersburg city, adopt the power supply of P150) ultraviolet radiation under, and with the linear velocity of 50fpm by twice.Then with hand the PET film is removed from master tooling.The final applied thickness of the prism-shaped coating that forms at the PET film is about 25 microns.

The polarization by reflection optics film of film preparation B-prism-shaped micro-structural

To prepare blooming with mode identical described in the film preparation B; difference is: the PET film is replaced with the reflective polarizer film of the use Sahara SA 115 protectiveness contact beds described in the example 3 of the U.S. Patent application No.60/668873 that submitted on April 6th, 2005, this patented claim is incorporated herein by reference.

Film preparation C

To prepare blooming with mode identical described in the film preparation B, difference is: the prismatic pattern that master tooling has is spaced apart 90 degree prisms 50 microns, that arrange by line style by nominal pitch and consists of, wherein these prisms of arranging by line style are designed to have the peak height that pseudorandom rises and falls, and similar to the geometric configuration pattern of the prism that has on the Vikuiti BEF III (can available from the 3M company that is positioned at St.Paul city, Minn.).

The monolithic relative gain of the unpolarized optics film (film preparation A) of table 1-micro-structural

The example of microstructured optical films	Polymerizable resin composition	The monolithic relative gain
			Embodiment 1	Example 2	1.969
Embodiment 2	Example 3	1.932
			Embodiment 3	Example 4	1.873
Embodiment 4	Example 6	1.876
			Embodiment 5	Example 7	1.831
Embodiment 6	Example 5	1.925
			Comparative Examples 7	Comparative Examples 8	1.748

About following table 2, the preparation assembly, wherein, with the prism-shaped microstructured optical films in the table 1 separately with non-structured polarization by reflection film-stack so that the light transmission shaft of described reflective polarizer films is vertical with described prism.The reflective polarizer films that adopts is identical with the bottom substrate described in the film preparation B.

The relative gain that the assembly that table 2-is made of unpolarized optics film and the non-structured reflective polarizer films of micro-structural has

The example of microstructured optical films	Polymerizable resin composition	The relative gain of assembly
			Embodiment
8	Example 2	2.751
			Embodiment 9	Example 3	2.724
Embodiment 10	Example 4	2.654
			Embodiment 11	Example 6	2.663
Embodiment 12	Example 7	2.616
			Embodiment 13	Example 5	2.707
Comparative Examples 14	Comparative Examples 8	2.544

About following table 3, the preparation assembly is wherein with the pellicular cascade identical with second separately of the prism-shaped microstructured optical films in the table 1.The prism-shaped microstructured surface of end film contacts with the bottom substrate of top film, so that prism that should end film and this top film is prismatic vertical.

The relative gain that the assembly that table 3-is made of the unpolarized optics film of a pair of identical micro-structural has

The example of assembly	Polymerizable resin composition	The example of single-iris	The relative gain of assembly
				Embodiment 15	Example 2	Embodiment 1	3.191
Embodiment 16	Example 3	Embodiment 2	3.138
				Embodiment 17	Example 4	Embodiment 3	2.947
Embodiment 18	Example 6	Embodiment 4	3.035
				Embodiment 19	Example 7	Embodiment 5	2.937
Embodiment 20	Example 5	Embodiment 6	3.120
				Comparative Examples 21	Comparative Examples 8	Comparative Examples 7	2.762

About following table 4, non-structured reflective polarizer films is layered on the assembly in the table 3, so that the teleblem sheet in the light transmission shaft of this reflective polarizer films and this assembly is prismatic vertical.The reflective polarizer films that adopts is identical with the bottom substrate described in the film preparation B.

The relative gain that the assembly that table 4-is made of unpolarized optics film and the non-structured polarization by reflection optics of a slice film of a pair of identical micro-structural has

The example of assembly	Polymerizable resin composition	The example of single-iris	The relative gain of assembly
				Embodiment
22	Example 2	Embodiment 1	3.576
				Embodiment 23	Example 3	Embodiment 2	3.618
Embodiment 24	Example 4	Embodiment 3	3.475
				Embodiment 25	Example 6	Embodiment 4	3.549
Embodiment 26	Example 7	Embodiment 5	3.481
				Embodiment 27	Example 5	Embodiment 6	3.580
Comparative Examples 28	Comparative Examples 8	Comparative Examples 7	3.330

The monolithic relative gain of the polarization by reflection optics film (embodiment 29 and embodiment 30, film preparation B) of table 5-micro-structural

About following table 6, the preparation assembly, wherein with the prism-shaped microstructured optical films in the table 1 separately with table 5 in prism-shaped micro-structural film-stack.The prism-shaped microstructured surface of end film is contacted with the bottom substrate of top film, so that prism that should end film and this top film is prismatic vertical.

The relative gain that the assembly that table 6-is made of the polarization by reflection optics film of the unpolarized optics film of micro-structural and micro-structural has

The example of assembly	The example of end film	The example of top film	Relative gain
				Embodiment 32	Embodiment 1	Embodiment 29	3.350
Embodiment 33	Embodiment 2	Embodiment 29	3.373
				Embodiment 34	Embodiment 3	Embodiment 29	3.322
Embodiment 35	Embodiment 4	Embodiment 29	3.373
				Embodiment 36	Embodiment 5	Embodiment 29	3.359
Embodiment 37	Embodiment 6	Embodiment 29	3.369
				Embodiment 38	Comparative Examples 7	Embodiment 29	3.307
Embodiment 39	Embodiment 1	Embodiment 30	4.023
				Embodiment 40	Embodiment 2	Embodiment 30	4.027
Embodiment 41	Embodiment 3	Embodiment 30	3.945
				Embodiment 42	Embodiment 4	Embodiment 30	4.006
Embodiment 43	Embodiment 5	Embodiment 30	3.990
				Embodiment 44	Embodiment 6	Embodiment 30	4.039
Embodiment 45	Comparative Examples 7	Embodiment 30	3.900
				Comparative Examples 46	Embodiment 6	Example 31	3.399
Comparative Examples 47	Comparative Examples 7	Example 31	3.258

The monolithic relative gain of the unpolarized optics film (film preparation C) of table 7-micro-structural

The example of film	The example of polymerizing resin	The monolithic relative gain
			Embodiment 48	Example 5	1.918
Embodiment 49	Example 9	1.892
			Embodiment 50	Example 10	1.875
Embodiment 51	Example 11	1.860
			Comparative Examples 52	Comparative Examples 8	1.741

[0197]About following table 8, the preparation assembly is wherein with the pellicular cascade identical with second separately of the prism-shaped microstructured optical films in the table 7.The prism-shaped microstructured surface of end film is contacted with the bottom substrate of top film, so that prism that should end film and this top film is prismatic vertical.

The relative gain that the assembly that table 8-is made of the unpolarized optics film of a pair of identical micro-structural has

The example of assembly	The example of polymerizing resin	The relative gain of assembly
			Embodiment 53	Example 5	2.927
Embodiment 54	Example 9	2.906
			Embodiment 55	Example 10	2.867
Embodiment 56	Example 11	2.833
			Comparative Examples 57	Comparative Examples 8	2.636

About following table 9, the preparation assembly, the prism-shaped microstructured surface of the end film shown in wherein will show contacts with the bottom substrate of top film shown in showing, so that prism that should end film and this top film is prismatic vertical.

The relative gain that the assembly that table 9-is made of the unpolarized optics film of a pair of different micro-structural has

The embodiment of assembly	The embodiment of end film	The embodiment of top film	Relative gain
				Embodiment 58	Embodiment 6	Embodiment 48	3.006
Embodiment 59	Embodiment 48	Embodiment 6	2.977
				Embodiment 60	Embodiment 4	Embodiment 6	3.060

Table 9 explanation, will be basically unpolarized microstructured optical films and second relative gain (being the monolithic relative gain) different when unpolarized microstructured optical films makes up basically with it, preferably, the microstructured optical films of monolithic gain higher (lower such as absorbance) is arranged in the top of this membrane stack assembly.

Polymerizable resin composition 12

With ZrO ₂About 4.5 hours of colloidal sol dialysis (can derive from the Spetra/Por Membrane MWCO 12-14 of VWR company, 000) obtains stable colloidal sol, and this colloidal sol contains 36.395% ZrO ₂With the ZrO that dialysed ₂5% aqueous solution (0.86g) of colloidal sol (220.0g), MEEAA (5.71g), BCEA (4.10g), 1-methoxy-2-propanol (300g), acrylic acid 2-(1-naphthoxy)-1-ethyl ester NOEA (29.98g), TMPTA (12.85g), BR31 (64.25g) and Prostab5198 joins in the round-bottomed flask, and removes alcohol and water by rotary evaporation.This contains ZrO ₂Resin contain 39.86% ZrO ₂, the refractive index of described resin is 1.64.Contain ZrO to this ₂Resin in add the TPO-L of 0.6 % by weight and be blended together.

Polymerizable resin composition 13

With the mixture diluted of 50/50 ratio of polymerizable resin composition 5 usefulness BR-31/SR339, until the refractive index of this potpourri is 1.64.

Use Hewlett Packard 8453 spectrophotometers and UV VIS Chem Station Rev.A.02.05 analysis software, measure the absorbance of polymerizable resin composition 12 and 13.Be that the liquid towards polymerizing resin is tested in the quartz colorimetric utensil of 1cm at optical length.Be that 100% described resin is tested to solids content, this resin does not dilute with solvent.Use empty quartz colorimetric utensil to carry out the sample blank pH-value determination pH.These the results are shown among Fig. 3.

According to film preparation A polymerizable resin composition 12 and 13 is made microstructured optical films.

	Polymerizable resin composition	Relative gain
			Embodiment 61	12	1.793
Embodiment 62	13	1.829

The preparation assembly is wherein with embodiment 61 and 62 the prism-shaped microstructured optical films pellicular cascade identical with second separately.The prism-shaped microstructured surface of end film is contacted with the bottom substrate of top film, so that prism that should end film and this top film is prismatic vertical.

	Polymerizable resin composition	Relative gain
			Embodiment 63	12	2.652
Embodiment 64	13	2.807

Display device embodiment 65

In LCD display, with the assembly of embodiment 20 (that is, by refractive index be the intersection diaphragm that consists of of the basically unpolarized microstructured optical films of 1.6525 polymerizing resin preparation to) with can be available from the brightness enhancement film formation of the commodity " Vikuiti BEF-II 90/50 " by name of the 3M company that is positioned at St.Paul city, Minn. intersect diaphragm to comparing.

The LCD module comprises the CCFL light source, have a wedge shape light guide sheet of extracting pattern, be positioned at the multilayer of this light guide sheet back polymkeric substance minute surface backreflection sheet (sold by the 3M company that is positioned at St.Paul city, Minn., commodity be called ESR[enhanced specular reflectivity sheet]), be positioned at this light guide sheet front diffusion barrier, be positioned at assembly that the brightening film sheet by intersection of this diffusion barrier front consists of, be positioned at the diffusing protection sheet of BEF II sheet front and be the twisted nematic liquid crystal panel that has absorptive polarizer on its outside surface at last.Except ESR and brightness enhancement film, all display units all are the original papers of 15.4 inches LCD modules of the 4074C of the Hitachi type that has of commercially available Dell Latitude D800 notebook-computer system.Brightened optical film is orientated so that prismatic mutually vertical on the prism on diaphragm and another diaphragm, and parallel with the CCFL light source/vertical.

Use the Autronic conoscope of being produced by the Autronic-Melchers company limited that is positioned at German Karlsruhe city to characterize from the light of LCD module transmission.Cone light polarization measuring equipment is provided at luminance brightness on vertical plane and the horizontal plane and the graph of a relation at visual angle.These two the graph of a relation of luminance brightness and vertical polar angle of the assembly that is consisted of by commercially available film that Fig. 4 comprises the assembly of embodiment 20 and is used for contrast.This figure shows that film of the present invention and assembly have improved the anaclasis ability.An effect of this larger refracting power is that guiding light produces luminance peaks on the axle.Wherein having peak light illuminometer that the display of the assembly of embodiment 20 has reveals and basically approaches zero vertical polar angle.Be so that the light transmission shaft perpendicular of these prismatic grooves and this absorptive polarizer by handle and prismatic channel layout in the immediate micro-structural film of the rear portion absorptive polarizer of LCD, so that the brightness of display reaches maximization.This advantage comes from geometric optical theory, and the film with prism-shaped microstructure and the film of the present invention of standard all applied preferred prismatic orientation.

In addition, use white diffusion backreflection sheet to replace minute surface backreflection sheet and use with film of the present invention, this display device is tested.In addition, in this device, have and do not have and in the situation of commercially available reflecting polarizer (Vikuiti DBEF-P2 can derive from 3M company) film of the present invention is tested, and the multiple combination of itself and above-mentioned two kinds of backreflection sheets is tested.In all situations, (such as commercially available Vikuiti BEF-II) compares with the Application standard film, and the illuminometer of this device reveals measurable increase when using film of the present invention.

Claims (29)

1. optical film assembly, this optical film assembly comprises the first microstructured optical films, this first microstructured optical films and non-structured reflective polarizer films are close, and the gain that the assembly that is made of described the first microstructured optical films and described polarizing coating has is at least 2.59, wherein said the first microstructured optical films has microstructured surface, and this microstructured surface comprises the reaction product that is obtained at least 1.61 polymerizing resin by refractive index.

2. optical film assembly according to claim 1, wherein, described the first microstructured optical films has the pattern that is made of substantially parallel prism, described reflective polarizer films has light transmission shaft, and the described prism of described microstructured optical films is vertical with the described light transmission shaft of described reflective polarizer films.

3. blooming with microstructured surface, this blooming comprises the polymeric material of light-permeable, wherein, to be the monolithic relative gain be at least 2.46 reflective polarizer films to described blooming, and described microstructured surface comprises the reaction product that is obtained at least 1.61 polymerizing resin by refractive index.

4. blooming according to claim 3, wherein, described microstructured surface has the pattern that is made of substantially parallel prism, and described prism combines with the polarization by reflection bottom with light transmission shaft, wherein, described prism is vertical with the described light transmission shaft of described reflective polarizer films.

5. optical film assembly, this optical film assembly comprises microstructured optical films claimed in claim 3, and this microstructured optical films and the second blooming are close.

6. optical film assembly according to claim 5, wherein, described the second blooming is turning film, polarizing coating, diffusion barrier or its combination.

7. optical film assembly, this optical film assembly comprises the micro-structural reflective polarizer films, this micro-structural reflective polarizer films is with unpolarized microstructured optical films is close basically, and, the relative gain of described micro-structural reflective polarizer films and described basically unpolarized microstructured optical films is at least 3.33, wherein said micro-structural reflective polarizer films and described basically unpolarized microstructured optical films all have microstructured surface, and this microstructured surface comprises the reaction product that is obtained at least 1.61 polymerizing resin by refractive index.

8. optical film assembly, this optical film assembly comprises the first blooming with microstructured surface, this first blooming is made of the polymeric material of the light-permeable that comprises 10 % by weight inorganic nanoparticles at least, wherein, described the first blooming and the second blooming are close, and wherein said microstructured surface comprises the reaction product that is obtained at least 1.61 polymerizing resin by refractive index.

9. optical film assembly according to claim 8, wherein, described the second blooming is selected from: basically unpolarized blooming, micro-structural reflective polarizer films, destructuring reflective polarizer films, absorptive polarizer, turning film, diffusion barrier and combination thereof.

10. blooming with microstructured surface, this blooming comprises the polymeric material of light-permeable, wherein, described film comprises the reaction product of polymerisable compound, this polymerisable compound comprises the inorganic nanoparticles of one or more ethylenically unsaturated monomers and at least 10 % by weight, and the refractive index of this polymerisable compound is at least 1.61, wherein said polymerisable compound to wavelength be the absorbance of light of 450nm less than 2.5, and to wavelength for about 575nm to the absorbance of the light of 800nm less than 1.

11. blooming with microstructured surface, this blooming comprises the polymeric material of light-permeable, wherein, described film comprises the reaction product of polymerisable compound, the refractive index of this polymerisable compound is at least 1.61, and to wavelength be the absorbance of light of 450nm less than 2.5, to wavelength for about 575nm to the absorbance of the light of 800nm less than 1.

12. a display device, this display device has:

(a) light fixture, this light fixture has light-emitting area; With

(b) by the described blooming of any one claim among the claim 3-4,10 or 11, this blooming is arranged to described light-emitting area close.

13. display device according to claim 12, wherein, described light fixture is backlight display device.

14. display device according to claim 12, wherein, described light fixture is liquid crystal indicator backlight.

15. display device according to claim 12, wherein, described device is hand-held device, graphoscope or televisor.

16. display device according to claim 12, wherein, described device comprises the absorptive polarizer with light transmission shaft, this absorptive polarizer and microstructured optical films are close, described microstructured optical films has the pattern that is made of substantially parallel prism, and the described light transmission shaft perpendicular of described prism and described absorptive polarizer.

17. a display device, this display device has:

(a) light fixture, this light fixture has light-emitting area; With

(b) by the described optical film assembly of any one claim among claim 1-2 or the 5-9, this assembly is arranged to described light-emitting area close.

18. display device according to claim 17, wherein, described light fixture is backlight display device.

19. display device according to claim 17, wherein, described light fixture is liquid crystal indicator backlight.

20. display device according to claim 17, wherein, described device is hand-held device, graphoscope or televisor.

21. display device according to claim 17, wherein, described device comprises the absorptive polarizer with light transmission shaft, this absorptive polarizer and microstructured optical films are close, described microstructured optical films has the pattern that is made of substantially parallel prism, and the described light transmission shaft perpendicular of described prism and described absorptive polarizer.

22. each described blooming according to claim 3-4 and among the 10-11, wherein said polymerizing resin comprises Zirconium oxide nano grain.

23. blooming according to claim 22, the primary particle diameter of wherein said Zirconium oxide nano grain are 5nm to 50nm.

24. blooming according to claim 22, the amount of wherein said Zirconium oxide nano grain are 10 % by weight to 70 % by weight.

25. blooming according to claim 22, the amount of wherein said Zirconium oxide nano grain are 30 % by weight to 60 % by weight.

26. each described optical film assembly according to claim 1-2 and among the 5-9, wherein said polymerizing resin comprises Zirconium oxide nano grain.

27. optical film assembly according to claim 26, the primary particle diameter of wherein said Zirconium oxide nano grain are 5nm to 50nm.

28. optical film assembly according to claim 26, the amount of wherein said Zirconium oxide nano grain are 10 % by weight to 70 % by weight.

29. optical film assembly according to claim 26, the amount of wherein said Zirconium oxide nano grain are 30 % by weight to 60 % by weight.

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