CN102326118A - Coupling Polarizer assembly and the face inscribe that comprises this assembly LCD of remodeling - Google Patents
Coupling Polarizer assembly and the face inscribe that comprises this assembly LCD of remodeling Download PDFInfo
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- CN102326118A CN102326118A CN201080009021XA CN201080009021A CN102326118A CN 102326118 A CN102326118 A CN 102326118A CN 201080009021X A CN201080009021X A CN 201080009021XA CN 201080009021 A CN201080009021 A CN 201080009021A CN 102326118 A CN102326118 A CN 102326118A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133634—Birefringent elements, e.g. for optical compensation the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
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- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Geometry (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a kind of be coupled Polarizer assembly and the face inscribe that comprises this coupling Polarizer assembly LCD of remodeling.Particularly; The invention discloses the coupling Polarizer assembly that comprises compensate film and comprise the remodel LCD of liquid crystal of this coupling Polarizer assembly and face inscribe, said compensate film is designed to have specific optical property under in-plane-switching mode, to make color distortion with the view direction variation and minimize and to guarantee wide visual angle.According to LCD of the present invention, because the degree of distribution of the variation of the polarization state on Poincare polarization ball (Poincare Sphere) is less, thus the color distortion that changes with view direction is minimized, and can guarantee wide visual angle.In addition,, only use a slice compensate film just can guarantee wide visual angle, thereby can high productivity realize the large-scale production (defect rate that reduction causes owing to foreign matter) of thin LCD for last Polarizer and following Polarizer.
Description
Technical field
The present invention relates to a kind of be coupled Polarizer assembly and the face inscribe that comprises this assembly LCD of remodeling, wherein when with said coupling Polarizer component application when the face inscribe is remodeled LCD, it can make color distortion minimize and guarantee wide visual angle.
Background technology
LCD (LCD), normal image display have obtained using widely.Yet although it has the characteristic of multiple excellence, narrow visual angle is considered to its shortcoming.
The pattern of LCD is that the original alignment according to liquid crystal, the structure of electrode and the performance of liquid crystal are classified, and the pattern of LCD commonly used is twisted-nematic (TN) pattern, homeotropic alignment (VA) pattern and face intra (IPS) pattern at present.In addition; According to not accepting whether can be divided into normal black (normal black) pattern and normal (normal white) pattern in vain under the voltage condition through light; Zone and original alignment according to liquid crystal; The VA pattern is divided into PVA (patterning VA (patterned VA)) pattern, SPVA (super PVA) pattern and MVA (multizone VA) pattern, and the IPS pattern is divided into S-IPS (super IPS) pattern or FFS (fringe field switching) pattern.
When liquid crystal molecule was not activated, in-plane-switching mode had evenly and is basically parallel to the arrangement of substrate surface.Therefore; Because when fast direction on front surface of light transmission shaft and the liquid crystal molecule of Polarizer is identical instantly; Because the optical property of liquid crystal, even also identical in the direction of the fast axle of the above light transmission shaft of surface that tilts and liquid crystal, though therefore light under passing behind the Polarizer through LCD; The variation of polarization state can not take place yet, thereby it can pass liquid crystal layer and not change.Therefore, through can under unactivated state, showing predetermined black state at the upper surface of substrate and the arrangement of the Polarizer on the lower surface.Such face inscribe LCD of remodeling just can be realized wide visual angle usually under the situation of not using blooming, thereby make it have the advantage of uniform image with the visual angle that covers whole screen is provided when guaranteeing transmittance naturally.Therefore, said inscribe LCD of remodeling is mainly used in the high-end display more than 18 inches.
The Polarizer that in association area, uses the LCD of in-plane-switching mode need be positioned at the liquid crystal cell outside that comprises liquid crystal makes light polarizationization, and on the one or both sides of said Polarizer, uses and protect polaroid by the film formed diaphragm of TAC (triacetyl cellulose).In this structure; When attitude is deceived in liquid crystal display; By the light of the polaroid polarization on the following Polarizer be not on the frontal plane but on the clinoplane that forms by triacetyl cellulose by the polarization of oval ground; Thereby make the light of elliptic polarizationization in liquid crystal cell, increase polarization, so light transmission and have multiple color.
In addition, in recent years, along with to the demand of big image display device (for example using the large scale TV of in-plane-switching mode) and require wide visual angle.Therefore; In the face inscribe is remodeled LCD; In order to ensure wide visual angle; Prepare display: the isotropy protective seam that replaces the TAC film is set, and range upon range ofly has the two-layer of different optical performance or a layer of compensation of multilayer more, a Z-axle orientation (being orientated along thickness direction) film perhaps is set between the polaroid of liquid crystal cell and another Polarizer between the PVA of a Polarizer of liquid crystal cell and liquid crystal cell through following method.
The remodel detailed construction of LCD of the face inscribe that being used to of proposing in the association area compensates the visual angle is described below.Structure according to LCD with in-plane-switching mode; When the place ahead is watched; Said liquid crystal vertical (90 °) orientation when not applying voltage; The angle that is included in the absorption axes of the polaroid in the following Polarizer of backlight side is 90 °, and the isotropy diaphragm is set between Polarizer and liquid crystal cell.In addition, the angle that is included in the absorption axes of the polaroid in the Polarizer that shows side is 0 °, and in the liquid crystal cell side, the following blooming of configuration between polaroid and liquid crystal cell.
There has been the LCD (korean patent application 2008-118531 number) that comprises negative C-plate and positive biaxial plates; The LCD (korean patent application 2008-118532 number) that comprises positive A-plate and positive twin shaft half; The LCD (korean patent application 2008-123002 number) that comprises negative biaxial plates and positive biaxial plates; The LCD that comprises positive A-plate and positive C-plate; The LCD that comprises negative biaxial plates and positive C-plate; The LCD that comprises positive C-plate and negative biaxial plates; The LCD (korean patent application 2008-27107 number) that comprises negative A-plate and negative biaxial plates; The LCD (korean patent application 2008-43414 number) that comprises positive biaxial plates and negative biaxial plates; The LCD (korean patent application 2008-2190 number) that comprises negative A-plate and negative C-plate; The LCD (korean patent application 2008-26831 number) that comprises positive biaxial plates and negative C-plate; The LCD that comprises Z-axle alignment films and positive C-plate; With the LCD that comprises a slice Z-axle alignment films.
These structures can be through roll-to-roll method (roll-to-roll method) preparation, and it helps large-scale production.
Yet; The LCD that in association area, proposes uses the coupling Polarizer (following isotropic membrane+two a last layer of compensation) of three layers of compensate film type that on a side of liquid crystal layer, form through the two-layer laminate that will have the different optical performance, perhaps uses the necessary collapse step of shrink film to be difficult to have large-area Z-axle alignment films owing to lower economic benefit with in the preparation process.
Therefore; In association area, owing to use with three coupling Polarizers that compensate film is range upon range of, because the thickness of liquid crystal cell both sides is different; The variation of temperature or humidity causes bending easily; So be difficult to prepare thin product, and owing to use expensive compensate film to cause relatively poor price competitiveness, its use is limited to the expensive face inscribe LCD of remodeling.
Summary of the invention
Technical matters
The invention provides the coupling Polarizer assembly and the economy that comprises this coupling Polarizer assembly and thin LCD that comprise compensate film; Said compensate film is designed has the special optical performance under in-plane-switching mode, to make the color distortion that changes with any view direction and minimize and to guarantee wide visual angle; Because the degree of distribution of the polarization state on Poincare polarization ball (Poincare Sphere) is less; Said inscribe LCD of remodeling provides high-quality image through color distortion is minimized, and guarantees wide visual angle simultaneously.
Technical scheme
The invention provides a kind of coupling Polarizer assembly, it comprises: go up Polarizer, it has from top to bottom successively diaphragm, polaroid and first compensate film; With following Polarizer; It has from top to bottom successively second compensate film, polaroid and diaphragm; Wherein, Said first compensate film has and postpones (R0) and-1～-0.01 refractive index ratio (refractive index ratio) in the face of 50～200nm (NZ), and its slow axis is parallel to the absorption axes of the polaroid in the Polarizer, and said second compensate film has the interior delay of face (R0) of 50～250nm and-2～-0.5 refractive index ratio; And its slow axis is perpendicular to the absorption axes of the polaroid in the following Polarizer, and the summation that postpones in the face of said first compensate film and second compensate film is 200～350nm.
In addition, the invention provides the face inscribe that the comprises aforesaid coupling Polarizer assembly LCD of remodeling.
Beneficial effect
According to coupling Polarizer assembly of the present invention; When it is used for the face inscribe and remodels LCD; Because the degree of distribution of the polarization state on Poincare polarization ball is less; Said coupling Polarizer assembly can make the color distortion that changes with any view direction minimize, and guarantee can with association area in use three layers of compensate film to reach the wide visual angle that compare of level.In addition,, only just can guarantee wide visual angle, thereby make the large-scale production that can high productivity realizes approaching LCD (defect rate that reduction causes owing to foreign matter or impurity) with one deck compensate film for last Polarizer and following Polarizer.
Description of drawings
In conjunction with accompanying drawing, it is more obvious that above-mentioned purpose of the present invention, feature and advantage will become to those skilled in the art.In the accompanying drawings:
Fig. 1 is the stereographic map of diagram according to the structure of in-plane switching liquid crystal display of the present invention (IPS-LCD);
Fig. 2 is the synoptic diagram of diagram according to the refractive index of compensate film of the present invention;
Fig. 3 is for showing the synoptic diagram in the machine direction of preparation process of the unreeling direction be used for illustrating compensate film and Polarizer;
Fig. 4 is the synoptic diagram of the expression of Φ and θ in the diagram coordinate system of the present invention;
Fig. 5 passes through the figure of the region of variation of first compensate film, liquid crystal cell and the polarization state of second compensate film on Poincare polarization ball for showing according to the present invention in Φ=45 ° the view direction with θ=60 °;
Fig. 6 is the figure that is presented at the analog result of the transmittance on all view directions of embodiments of the invention 1;
Fig. 7 is the figure of the variation of the polarization state on Poincare polarization ball on the view direction of Φ=45 ° and θ=60 ° that shows embodiments of the invention 1;
Fig. 8 for show embodiments of the invention 1 in the visible-range of 380nm to 780nm with the figure of the polarized state of light of the wavelength increment of 10nm;
Fig. 9 shows the figure according to the chromaticity coordinates of black mode on all view directions of embodiments of the invention 1;
Figure 10 is the figure of the analog result of the transmittance on all view directions that show embodiments of the invention 2;
Figure 11 be presented at embodiments of the invention 2 on the view direction of Φ=45 ° and θ=60 ° with 550nm short wavelength under the figure of scope of polarization state on the included Poincare polarization ball of variation range and the present invention of polarization state;
Figure 12 for show embodiments of the invention 2 in the visible-range of 380nm to 780nm with the figure of the polarized state of light of the wavelength increment of 10nm;
Figure 13 is the figure of the analog result of the transmittance on all view directions that show embodiments of the invention 3;
Figure 14 be presented at embodiments of the invention 3 on the view direction of Φ=45 ° and θ=60 ° with 550nm short wavelength under the figure of scope of polarization state on the included Poincare polarization ball of variation range and the present invention of polarization state;
Figure 15 for show embodiments of the invention 3 in the visible-range of 380nm to 780nm with the figure of the polarized state of light of the wavelength increment of 10nm;
Figure 16 is the figure of the analog result of the transmittance on all view directions that show comparative example 1 of the present invention;
Figure 17 be presented at comparative example 1 of the present invention on the view direction of Φ=45 ° and θ=60 ° with 550nm short wavelength under the figure of scope of polarization state on the included Poincare polarization ball of variation range and the present invention of polarization state;
Figure 18 for show comparative example 1 of the present invention in the visible-range of 380nm to 780nm with the figure of the polarized state of light of the wavelength increment of 10nm;
Figure 19 is presented at the figure according to the chromaticity coordinates on all view directions under the comparative example's 1 of the present invention black mode;
Figure 20 is the figure of the analog result of the transmittance on all view directions that show comparative example 2 of the present invention;
Figure 21 is presented at the figure according to the chromaticity coordinates on all view directions under the comparative example's 2 of the present invention black mode;
Figure 22 is the figure of the analog result of the transmittance from all view directions that shows comparative example 3 of the present invention;
Figure 23 is the figure of the analog result of the transmittance from all view directions that shows comparative example 4 of the present invention.
Embodiment
The coupling Polarizer assembly that the present invention relates to comprise compensate film and the face inscribe that comprises this coupling Polarizer assembly LCD of remodeling; Wherein, said compensate film is designed and has particular optical performance so that be used for guaranteeing when the face inscribe is remodeled LCD the sharpness of wide visual angle and image when it.
Coupling Polarizer assembly of the present invention comprises: go up Polarizer, it has from top to bottom successively diaphragm, polaroid and first compensate film; With following Polarizer, it has from top to bottom successively second compensate film, polaroid and diaphragm.
It is that 50～200nm and refractive index ratio (NZ) are-1～-0.01 optical property that said first compensate film has interior postpone (R0) of face; It is that 50～250nm and refractive index ratio (NZ) are-2～-0.5 optical property that said second compensate film has interior postpone (R0) of face, and the summation that postpones in the face of said first compensate film and second compensate film is 200～350nm.In addition, the slow axis of said first compensate film is parallel to the absorption axes of the polaroid in the Polarizer, and the slow axis of said second compensate film is perpendicular to the absorption axes of the polaroid in the following Polarizer.
For all wavelengths in visible-range, the optical property of compensate film of the present invention is by 1～3 definition of following formula.
If the wavelength of light source does not have special declaration; What then describe is the optical property of 589nm, and wherein, Nx is the refractive index that in face, has the axle of largest refractive index on the direction; Ny is the refractive index on the vertical direction of Nx on the direction in face; And Nz is the refractive index of thickness direction, and it is expressed as follows, in Fig. 2:
[formula 1]
Rth＝[(Nx+Ny)/2-Nz]×d
Wherein, Nx and Ny are refractive indexes in the face, and Nx >=Ny, and Nz is the refractive index of the light of vibration (oscillate) on the thickness direction of film, and d is the thickness of film;
[formula 2]
R0＝(Nx-Ny)×d
Wherein, Nx and Ny are refractive index in the face of compensate film, and d is the thickness of film, and Nx >=Ny; And
[formula 3]
NZ＝(Nx-Nz)/(Nx-Ny)＝Rth/R0+0.5
Wherein, Nx and Ny are refractive indexes in the face, and Nx >=Ny, and Nz is the refractive index of the light that on the thickness direction of film, vibrates, and d is the thickness of film.
At this, Rth is the delay of thickness direction, the phase differential of mean refractive index in its demonstration and the face on thickness direction; And it is not actual phase differential, but reference value, R0 postpones in the face; When light saw through film with orthogonal directions (vertical direction), it was actual phase differential.
In addition, NZ is a refractive index ratio, can tell the type of the plate of compensate film according to it.The type of the plate of compensate film is called: the A-plate, and it has optical axis (optical propagation direction that does not have phase differential to exist) on direction in the face of film; The C-plate, it has the optical axis perpendicular to in-plane; And the biaxial plates when having two optical axises.
Particularly, for NZ=1, refractive index meets Nx＞Ny=Nz, is called positive A-plate; For 1＜NZ, refractive index meets Nx＞Ny＞Nz, is called negative twin shaft A-plate; For 0＜NZ＜1, refractive index has the following Nx of relation＞Nz＞Ny, is called Z-axle alignment films; For NZ=0, refractive index has the following Nx=Nz of relation＞Ny, is called negative A-plate; For NZ＜0, refractive index has the following Nz of relation＞Nx＞Ny, is called positive twin shaft A-plate; For NZ=∞, refractive index has the following Nx=Ny of relation＞Nz, is called negative C-plate; During for NZ=-∞, refractive index has the following Nz of relation＞Nx=Ny, is called positive C-plate.
Yet,, in the method for real world, be difficult to ideally prepare A-plate and C-plate according to the definition of theory.Therefore, in general method, the predetermined value in the scope that postpones in the approximate range of the refractive index ratio through setting the A-plate and the face of C-plate is distinguished A-plate and C-plate.Set predetermined value and when being applied to all other materials that have different refractive indexes according to stretching, have limitation.Therefore, the compensate film that comprises in the upper and lower Polarizer of the present invention is by the expressions such as NZ, R0 and Rth that comprise numeral, and it is the optical property of plate, rather than according to the isotropy of refractive index.
These compensate films have phase differential through stretching, and the film that wherein increases in the draw direction refractive index has just (+) refractive index performance, and the film that reduces in the draw direction refractive index has negative (-) refractive index performance.Have that just the compensate film of (+) refractive index performance can be by a kind of the processing that is selected from TAC (triacetyl cellulose), COP (cyclic olefin polymer), COC (cyclic olefine copolymer), PET (polyethylene terephthalate), PP (polypropylene), PC (polycarbonate), PSF (polysulfones) and PMMA (polymethylmethacrylate); And particularly, the compensate film with negative (-) refractive index can be processed by modification PS (polystyrene) or modification PC (polycarbonate).
In addition; The drawing process of giving the compensate film optical property is divided into stiff end stretching and free end stretching; Wherein, Said stiff end is stretched as in the drawing process of film fixing length except draw direction, and free end is stretched as in the drawing process of film and except draw direction, also degree of freedom will be provided on other direction.Generally speaking, in drawing process, film is shrinking on other direction except draw direction, but Z-axle alignment films needs special shrink process rather than stretch processing.
Fig. 3 has shown the direction of the former film (raw film) of reeling, and wherein, the unreeling direction of coiling film is called MD (machine direction), and is called TD (laterally) perpendicular to the direction of MD.In addition, in this process, the stretching of film on MD is called free end and stretches, and the stretching on TD is called the stiff end stretching.
Sum up the type of NZ and plate according to drawing process (when only using first method), just having through the free end stretching, the film of (+) refractive index performance can prepare positive A-plate; Just having through the stiff end stretching, the film of (+) refraction performance can prepare negative twin shaft A-plate; Stretch through free end, then stiff end shrinks the film with (+) refraction performance just or negative (-) refraction performance and can prepare Z-axle alignment films; The film that has negative (-) refraction performance through the free end stretching can prepare negative A-plate; And can prepare positive twin shaft A-plate through stiff end the film that stretches with negative (-) refraction performance.
Except said method, can control the direction of slow axis, phase differential and NZ value through using other method, and said other method does not receive special restriction for one of common many methods that adopt in comprising the field of the invention.
Coupling Polarizer assembly of the present invention comprises: go up Polarizer, it has from top to bottom successively diaphragm, polaroid and first compensate film; With following Polarizer, it has from top to bottom successively second compensate film, polaroid and diaphragm.
Said first compensate film has the interior refractive index ratio (NZ) that postpones (R0) and-1～-0.01 of face of 50～200nm, and said second compensate film has the interior refractive index ratio (NZ) that postpones (R0) and-2～-0.5 of face of 50～250nm.
As shown in Figure 5; First and second compensate films according to the present invention should have following optical property: the polarization state on Poincare polarization ball should change at redness circle interior zone; So that the cross-color that changes according to all view direction minimizes, the remodel wide visual angle of LCD of the face inscribe of guaranteeing to comprise said first and second compensate films.In this structure, said red circle has the radius by following distance definition: the polarization state on the Poincare polarization ball during from polaroid that light passes down Polarizer with visual angle and the 550nm short wavelength of Φ=45 and θ=60 to light wherein by the last distance of the polarization state of the absorption axes of Polarizer of absorption entering substantially.
Therefore, said first and second compensate films are controlled polarization state with respect to the optical property of another compensate film so that said zone remains in the red circle through regulating a compensate film.The present invention selects with respect to second compensate film and uses first compensate film to make all polarization states remain on the inner zone of red circle.
Particularly; With reference to Fig. 5; 50nm (it is the interior lower limit that postpones (R0) of face of second compensate film) is the value that wherein in preparing the method for compensate film, can realize high yield; Wherein, the minimum refractive index that meets the LCD of the object of the invention (red circle) is-2 (being numbered 4 redness circle) than (NZ).Afterwards, begin to increase and reach-0.7 contact point that just produces with red circle from-2, postpone in the wherein maximum face for 250nm (being numbered 3,2 and 1 redness circle) up to refractive index ratio (NZ).In addition; When refractive index ratio (NZ) surpasses-0.7, there not be to produce the contact point with circle, still should remain on right-hand circular polarization-below 0.5 wherein can not take place; To satisfy compensation condition about liquid crystal cell; Wherein, postpone in said remain on 250nm, wherein because the polarization state on Poincare polarization ball that second compensate film causes [S3 for just (+)] not on episphere.
Therefore; As shown in Figure 5; Select first compensate film to be used for the present invention; When the polarization state of being confirmed by the optical property of second compensate film [red 1,2,3 and 4] in the maximum region of variation (redness) of the polarization state that is passed in Poincare polarization ball during with liquid crystal [ blueness 1,2,3 and 4], the polarization state of said first compensate film that can satisfy compensation condition of the present invention is near stain F.Can be used as first compensate film near any film of the optical property of stain F although have; Refractive index ratio (NZ) is remained in-1～-0.01 the scope easily on Poincare polarization ball, simulating, and to postpone (R0) in can be near the face of a F in said refractive index ratio scope be 50～200nm.
May be used to first compensate film and second compensate film although satisfy any film of above-mentioned optical property; Preferably prepare first compensate film: the film with negative (-) refractive index is implemented once or more times stiff end stretching, and implemented on the TD than making slow axis on MD in stretching more frequently on the MD through following steps.This is in order to apply it in the roll-to-roll method, and the absorption axes of wherein going up Polarizer is on MD, and therefore, the slow axis of first compensate film should remain on the MD.In addition, prepare second compensate film: the film with negative (-) refractive index is implemented once or stiff end stretching more frequently, and implemented on the MD than making slow axis on TD in stretching more frequently on the TD through following steps.This makes for it easily is applied in the roll-to-roll method, the absorption axes of polaroid that wherein descends Polarizer on MD, thereby make the slow axis of second compensate film remain on the TD.
The absorption axes that is parallel to the polaroid in the Polarizer with the slow axis of said first compensate film is provided with first compensate film, and perpendicular to the absorption axes of the polaroid of Polarizer down second compensate film is set with the slow axis of said second compensate film.
Simultaneously, the phase differential (radian) of most of optical systems that comprises liquid crystal and compensate film is according to the wavelength of light source and different, makes polarization state after passing optical system according to wavelength change.Most of optical systems phase differential (radian) when the short wavelength is big; And phase differential (radian) is little when the long wavelength; Make the variation of the polarization state when the short wavelength greater than the variation of the polarization state when the long wavelength, and therefore, produced distribution (distribution).This distribution causes the color distortion according to the view directions variation, makes it influence the picture quality of LCD.The present invention's design minimizes color distortion in order to distribute through control, and controls said distribution through the polarization state that changes on Poincare polarization ball.
The direction of the slow axis of direction of orientation of liquid crystal (alignment direction) and compensate film is presented at the change direction of the polarization state on the Poincare polarization ball.When the slow-axis direction of the direction of orientation of said liquid crystal and compensate film is level; Their polarization state causes the distribution of identical polarization and light to increase; Perhaps when they were vertical, their polarization state caused polarization in the opposite direction, thereby had stoped the distribution of light.The increase that distributes shows the variation aggravation of color (color) along with view directions, wherein, because can produce color distortion, more advantageously is that said distribution is as much as possible little.In the present invention, the direction of orientation of liquid crystal makes their polarization state cause the polarization on the reverse direction perpendicular to the slow axis of compensate film, and therefore said distribution is littler than the distribution when axle is level.
In addition; When through the variation of the polarization of the direction of the slow axis of the direction of orientation of liquid crystal and compensate film when opposite each other, remain on through the summation that postpones in the face that makes first compensate film and second compensate film and can more effectively prevent distribution in the scope that is similar to the liquid crystal phase range.Postpone in the face therefore, the distribution of light is minimized through delay in the face is limited to for to the influential factor of the variation of the polarization state on each view direction.Particularly; The liquid crystal cell that uses in the present invention has the phase differential of 300～330nm scope under the wavelength of 589nm (Δ n * d) minimizes thereby remain on through the summation that postpones in the face that makes first compensate film and second compensate film can to make to distribute in the scope of 300 above-mentioned～330nm.Yet, owing to the objective of the invention is to make the minimized wide visual angle of guaranteeing simultaneously that distributes, the summation that postpones in the face of first compensate film and second compensate film should for 200～350nm to reach said purpose simultaneously.
Generally speaking, compensate film has the phase differential that changes according to the incident light wavelength.Phase differential is big when the short wavelength, and phase differential is little when the long wavelength, and the compensate film with these performances is called the compensate film with normal wavelength distribution (normal wavelength distribution).In addition, the film that when the short wavelength, has little phase differential and when the long wavelength, have a big phase differential is called the compensate film with head sea long distribute (inverse wavelength distribution).The distribution of compensate film is by the phase differential of the light source of the 780nm that in this area, uses usually and the ratio value representation of the phase differential of the light source of 380nm.As a reference, can realize in the long compensate film that distributes of the complete head sea of having of identical polarization state [R0 (380nm)/R0 (780nm)]=0.4872 to all wavelength.
Although the present invention can use all compensate films and need not to consider its distribution, [compensate film of R0 (380nm)/R0 (780nm)＞1 relies on the wavelength that just in time on light passes, reduces polarization state before the polaroid of Polarizer preferred the use.Particularly, just in time on light passes before the polaroid of Polarizer the wavelength of polarization state rely on the less fact to be illustrated in the change color that changes with view direction under the black mode little.Any material that satisfies this optical property may be used among the present invention.
PVA (polyvinyl alcohol (PVA)) layer (it is through stretching and dyeing provides the polaroid of polarization function) is separately positioned on the polaroid of upper and lower Polarizer, and diaphragm is separately positioned on down a side opposite on the PVA layer of PVA layer and last Polarizer of Polarizer with liquid crystal cell.Can prepare upper and lower Polarizer through method commonly used in this area, particularly, can use roll-to-roll method and sheet sheet (sheet-to-sheet) method.Consider productive rate and efficient in the preparation process, preferably use roll-to-roll method, and especially, it is effectively, because the direction of the absorption axes of PVA polaroid always is fixed on the MD.
In this structure, in the diaphragm of the diaphragm of following Polarizer and last Polarizer, the optical property that changes according to the difference of refractive index can not influence the visual angle, makes and does not limit refractive index in the present invention especially.Normally used in the art material can be used to prepare the diaphragm of upper and lower Polarizer; Particularly, can use and be selected from a kind of among TAC (triacetyl cellulose), COP (cyclic olefin polymer), COC (cyclic olefine copolymer), PET (polyethylene terephthalate), PP (polypropylene), PC (polycarbonate), PSF (polysulfones) and the PMMA (polymethylmethacrylate).
In addition, the face inscribe that the present invention relates to the to comprise said coupling Polarizer assembly LCD of remodeling.The said absorption axes of going up the absorption axes of Polarizer perpendicular to the polaroid in the following Polarizer
When liquid crystal aligning is 90 under not applying voltage condition; Liquid crystal cell is the face inscribe liquid crystal of remodeling; (Δ n * d) is 300nm～330nm to the panel phase differential of wherein under the wavelength of 589nm, being confirmed by following formula 4, and in structure of the present invention, is preferably about 310～320nm.This is half that the phase differential of the liquid crystal cell of (face inscribe remodel LCD) panel because IPS-LCD should be for 589nm (the strongest monochromatic light that the people can experience) wavelength; Thereby when when the IPS-LCD panel applies voltage, the light of linear polarization becomes white states (white state) through the linear polarization in vertical direction after passing liquid crystal cell in the horizontal direction after passing following Polarizer.In this case, can regulate its than the long a little point of said half-wavelength or short point to be white.
[formula 4]
(Δn×d)＝(ne-no)×d
Wherein, ne is the special ray refractive index of liquid crystal, and no is the ordinary ray refractive index, and d is a cel-gap, and Δ n and d are scalar and scalar.
The optical condition that LCD of the present invention has is: the maximum transmission rate of all light directions is below 0.2% under black mode, and is preferred below 0.05%.
In the present invention, be appreciated that the compensation principle of inclined surface through the polarization state that when light passes through each optical layers, changes Poincare polarization ball.When Fig. 6 is presented at the visual angle of Φ=45 ° and θ=60 °, according to the polarization state of LCD of the present invention.Particularly, it shows when the axle around Φ+90 ° rotates to the demonstration side in frontal plane with the θ angle surface of Φ direction, the variation of the polarization state of light on Poincare polarization ball that comes out from front direction.When the coordinate of S3 axle on Poincare polarization ball during for just (+); Right-hand circular polarization has appearred, wherein, and when a certain polarization horizontal component is Ex; And the polarization orthogonal component is Ey, and right-hand circular polarization is represented: the Ex component with respect to the phase delay of the light of Ey component greater than 0 and half the less than wavelength.In addition; In LCD according to the present invention, each polarization state when the short wavelength's with 550nm light passes each optical layers with the visual angle of Φ=45 ° and θ=60 ° on Poincare polarization ball has in the circle of following radius and is changing: pass the polarization state polarization state after the polaroid of Polarizer down absorbed supreme Polarizer substantially to light wherein the absorption axes from light.This is the interior zone of redness circle that is shown in Fig. 5; Wherein, When in the said polarization state any in said zone beyond the time; Though can realize transmittance,, make the color distortion of on the surface that tilts LCD with the change color highly significant of visual angle change as all light directions of a purpose of the present invention.
Fig. 1 for diagram according to the remodel stereographic map of basic structure of LCD of of the present invention inscribe, will further describe below.
From backlight unit 40 beginning, comprise down Polarizer 10, face inscribe remodel liquid crystal cell 30 and last Polarizer 20 according to of the present invention the inscribe LCD of remodeling.Said down Polarizer 10 has from top to bottom second compensate film 14, polaroid 11 and diaphragm 13 successively, and the said Polarizer 20 of going up has from top to bottom successively diaphragm 23, polaroid 21 and first compensate film 24.The absorption axes 22 of the polaroid 21 of last Polarizer and the polaroid 11 of following Polarizer is each other vertical with 12, and when when the front is seen, the absorption axes 12 of the polaroid 11 of said time Polarizer should vertically be provided with.
Particularly; When the absorption axes near the following Polarizer of backlight unit is vertical direction; The light that passes down Polarizer is in the horizontal direction by polarization; And when when passing the liquid crystal cell that applies panel voltage and realize white states, said light vertically advances and passes the last Polarizer of the absorption axes with horizontal direction that shows side.Can see light even have on the people of the polarized sunglasses that absorption axes is a horizontal direction (absorption axes of polarized sunglasses is a horizontal direction) one of display side from LCD.If when being horizontal direction near the absorption axes of the following Polarizer of backlight, the people who has on polarized sunglasses can not see image.
In addition; For large-sized LCD, consider that people's main perspective is wider than vertical direction in the horizontal direction, except the special LCD that is used for advertisement etc.; Common LCD is prepared into the type of 4: 3 or 16: 9 usually, so that from display side display image well.Therefore, when before the display side, watching, the absorption axes of following Polarizer is configured to vertical direction, and upward the absorption axes of Polarizer is configured to horizontal direction.
In last Polarizer, the slow axis 25 of said first compensate film 24 and the absorption axes 22 of said polaroid 21 are configured to be parallel to each other, and in following Polarizer, the slow axis 15 of said second compensate film 14 is configured to vertical each other with the absorption axes 12 of polaroid 11.
Can explain the effect of viewing angle compensation of the present invention through Poincare polarization ball.Said Poincare polarization ball is used to be presented at the variation of the polarization state of certain viewing angles; Make that when passing each optical element of LCD inside, it can show the variation of polarization state when the light that in LCD, advances with specific visual angle (it uses polarization to come display image).Said certain viewing angles in the present invention is the direction of Φ=45 ° and θ=60 ° in the hemisphere coordinate system that is shown among Fig. 4, and can find out Wavelength distribution through showing with respect to the variation from the polarization state of light on Poincare polarization ball of this direction of all wavelengths.
Hereinafter, in above-mentioned structure, be described in when not applying voltage the effect that realizes black state at all visual angles through embodiment and comparative example.Although can be more readily understood the present invention through following embodiment, following embodiment provides as instance of the present invention, and non-limiting by the desired protection scope of the present invention of accompanying claims.
Embodiment
Through using TECH WIZ LCD 1D (Sanayi System company limited, Korea S) to simulate the effect than broad visual angle, this instrument is the LCD simulation system of following embodiment 1-3 and comparative example 1-4.
The TECH WIZ LCD 1D (Sanayi System company limited, Korea S) that will be used to have stepped construction shown in Figure 1 according to the data of the actual measurement of each blooming of the present invention, liquid crystal cell and backlight.To describe the structure of Fig. 1 below in detail.
From backlight unit 40 beginnings; Be provided with down Polarizer 10, face inscribe remodel liquid crystal cell 30 (this liquid crystal cell has 90 ° liquid crystal aligning when showing that the side front is seen when not applying voltage) and last Polarizer 20; Wherein, Through forming Polarizer 10 down, and form and go up Polarizer 20 from remodel range upon range of first compensate film 24 of liquid crystal cell 30 beginnings, polaroid 21 and diaphragm 23 of face inscribe from backlight unit 40 beginning stacked guard film 13, polaroid 11 and second compensate film 14.
Said liquid crystal cell is the liquid crystal cell of the LC420WU5 of 42 inches panels being applied to LG display company limited (LG Display Co.Ltd.) and producing.
On the other hand, each blooming and the backlight unit that are used for present embodiment have following optical property.
At first; Make down the polaroid 11 and 21 of Polarizer 10 and last Polarizer 20 have polarization function through the PVA that stretches with iodine staining, and the polarization property of said polaroid is for having lumen degree of polarization (luminance degree of polarization) and the lumen group transmittance more than 41% (luminance group transmittance) more than 99.9% in the visible-range of 370～780nm.Lumen degree of polarization and lumen group transmittance are by 5～9 definition of following formula; When the transmittance according to the light transmission shaft of wavelength is TD (λ); Transmittance according to the absorption axes of wavelength is MD (λ); And the luminance compensation value that in JIS Z 8701:199, defines (luminance compensation value) for
wherein; S (λ) is the light source frequency spectrum, and light source is the C-light source.
[formula 5]
[formula 6]
[formula 7]
[formula 8]
[formula 9]
According to the optical property that produces by the difference of the interior refractive index on each film direction; For the light source of 589.3nm, use here that to postpone (R0) in the face be-1.2 second compensate film 14 for 150nm and refractive index ratio (NZ) as 70nm and refractive index ratio for postponing (R0) in-0.1 first compensate film 24 and the face.In this case, in last Polarizer 20, the absorption axes 22 of polaroid 21 and the slow axis 25 of first compensate film 24 are parallel to each other, and in following Polarizer 10, the absorption axes 12 of polaroid 11 is vertical each other with the slow axis of second compensate film 14 15.The summation that postpones in the face of first compensate film 24 and second compensate film 14 is 220nm.
First compensate film 24 and second compensate film 14 are prepared as follows: make PS (polystyrene) layer with negative index be arranged between the two-layer PMMA (polymethylmethacrylate) through using triple co-extrusions; Set gradually compensate film (I-Film through stretching then; Optes company, Japan).
The TAC (triacetyl cellulose) of optical property that in addition, will have the Rth of 50nm for the incident light of 589.3nm is used for outer diaphragm 13 and 23 protective seams as last Polarizer 20 and following Polarizer 10.The actual measurement data that is assemblied in 32 inches TV LC320WX4 type (LG.PHILIPS LCD company) is used for backlight unit 40.
Fig. 6 is presented at the analog result of the transmittance of all light directions behind the range upon range of optics as shown in Figure 1.Fig. 6 shows the transmittance of all light directions when on screen, showing black state, wherein, and in the scope of scale; When showing black state; Transmittance is 0%～0.2%, and the part that surpasses 0.02% transmittance representes that with red color the low-transmittance part is with blue color showing.In this case, can find out, wide more at the blue portion at center, the visual angle of guaranteeing broad more easily.This is the variation of the polarization state of the Poincare polarization ball when (Φ=45 ° and θ=60 °) because the visual angle that can see through most of light therein that in Fig. 7, shows.
In embodiment 1, the variation that under the visual angle of Φ=45 ° and θ=60 °, has 550nm short wavelength's polarisation of light is shown among Fig. 7.In Fig. 7; For first polarization state of right starting point is the polarization state when light passes down the polaroid of Polarizer; Second polarization state is the polarization state when light passes down second compensate film of Polarizer; The 3rd polarization state is the polarization state when light passes liquid crystal cell, and the 4th polarization state is the polarization state when light passes first compensate film of Polarizer.In embodiment 1, under above-mentioned condition, the redness circle that all polarization states of said layer all are in the scope of the invention is inherent.
Although the same with the configuration in embodiment 1, first compensate film 24 have postpone in the face of 100nm (R0) with and-0.1 refractive index ratio (NZ), and second compensate film 14 has delay (R0) and-0.7 refractive index ratio (NZ) in the face of 150nm.The summation that postpones in the face of first compensate film 24 and second compensate film 14 is 250nm.
Analog result as from the transmittance of all light directions obtains being shown in the result among Figure 10.Figure 10 shows the transmittance that when on screen, showing black state, distributes from all light directions; Wherein, In the scope of scale, when showing black state, transmittance is 0%～0.2%; The part that surpasses 0.02% transmittance shows with red color, and the low-transmittance part is with blue color showing.In this case, can find out, wide more at the blue portion at center, the visual angle of guaranteeing broad more easily.This is the variation of the polarization state of the Poincare polarization ball when (Φ=45 ° and θ=60 °) because the visual angle that can see through most of light therein that in Figure 11, shows.
In embodiment 2, the polarization variations of the light with 550nm short wavelength under the visual angle of Φ=45 ° and θ=60 ° is shown among Figure 11.In Figure 11; For first polarization state of right starting point is the polarization state when light passes down the polaroid of Polarizer; Second polarization state is the polarization state when light passes down second compensate film of Polarizer; The 3rd polarization state is the polarization state when light passes liquid crystal cell, and the 4th polarization state is the polarization state when light passes first compensate film of Polarizer.
In addition, in the LCD of embodiment 2, the polarized state of light for the wavelength increment of 10nm in the visible-range of 380nm to 780nm is shown among Figure 12.
Shown in figure 11, can from embodiment 2, find out: the polarization state 550nm short wavelength should change to realize effect of the present invention in the circle (red circle) in the polarization state scope on having Poincare polarization ball described here.
In the Fig. 7 and 11 according to embodiment 1 and 2, as the variation with respect to the polarization state of 550nm light source, the satisfied optical condition of first and second compensate films has situations a large amount of on mathematics when said polarization variations is in the redness circle.That is to say; Can use any compensate film, as long as its polarization state that satisfies particular optical performance that proposes in the present invention and the LCD that comprises them changes: the distance that can be absorbed the polarization state of the absorption axes of into going up Polarizer from the polarization state after the polaroid that passes Polarizer down at light to light wherein substantially in the circle with radius that following distance limits.
Although the same with the configuration among the embodiment 1, first compensate film 24 has the interior refractive index ratio (NZ) that postpones (R0) and-0.1 of face of 50nm, and second compensate film 14 has the interior refractive index ratio that postpones (R0) and-0.7 of face of 250nm.The summation that postpones in the face of first compensate film 24 and second compensate film 14 is 300nm.
Analog result as from the transmittance of all light directions obtains being shown in the result among Figure 13.Figure 13 shows when demonstration black state on screen the transmittance from all light directions, wherein, and in the scope of scale; When showing black state; Transmittance is 0%～0.2%, and the part that surpasses 0.02% transmittance shows with red color, and the low-transmittance part is with blue color showing.In this case, can find out, wide more at the blue portion at center, guarantee wideer visual angle more easily.This is the variation of the polarization state of the Poincare polarization ball when (Φ=45 ° and θ=60 °) because at the visual angle that can see through most of light therein that Figure 14 shows.
In embodiment 3, the polarization variations of the light with 550nm short wavelength under the visual angle of Φ=45 ° and θ=60 ° is shown among Figure 14.In Figure 14; For first polarization state of right starting point is the polarization state when light passes down the polaroid of Polarizer; Second polarization state is the polarization state when light passes down second compensate film of Polarizer; The 3rd polarization state is the polarization state when light passes liquid crystal cell, and the 4th polarization state is the polarization state when light passes first compensate film of Polarizer.
In addition, in embodiment 3 LCDs, the polarized state of light for the wavelength increment of 10nm in the visible-range of 380nm to 780nm is shown in Figure 15.
Shown in figure 15, from embodiment 3, can find out: the polarization state 550nm short wavelength should change to realize effect of the present invention in the circle (red circle) in the polarization state scope on having Poincare polarization ball described here.
The comparative example 1
Although it is the same with the configuration in embodiment 1; Prepare LCD through the range upon range of Polarizer of going up with following Polarizer; The wherein said Polarizer of going up is to be that 1.7 positive single shaft A-plate, polaroid and protection film formed for postponing (R0) in-1.3 positive twin shaft A-plate, the face for 70nm and refractive index ratio (NZ) for 60nm and refractive index ratio (NZ) through postponing (R0) in the lamination surface, and said Polarizer down is to be that 0nm and thickness direction retardation (Rth) are that isotropy protective seam, polaroid and the protection of 0nm is film formed through postponing (R0) in the lamination surface.In this structure, the slow axis of each positive single shaft A-plate and positive twin shaft A-plate is parallel to the absorption axes of the polaroid in the said Polarizer.
Result as the transmittance of all light directions simulation of the LCD of remodeling from the face inscribe obtains result shown in Figure 16.
In first comparative example, the polarization variations of the light with 550nm short wavelength under the visual angle of Φ=45 ° and θ=60 ° is shown among Figure 17.In Figure 17; For first polarization state of right starting point is the polarization state when light passes down the polaroid of Polarizer; Second polarization state is the polarization state when light passes down second compensate film of Polarizer; The 3rd polarization state is polarization state when light passes liquid crystal cell, and the 4th polarization state is the polarization state when light passes first compensate film of Polarizer, and the 5th polarization state is the polarization state when light passes the two the first compensate films of Polarizer.
In addition, in embodiment 1 and comparative example's 1 the LCD, the polarized state of light for the wavelength increment of 10nm in the visible-range of 380nm to 780nm is shown in Fig. 8 and 18.Generally speaking; Just in time the polarization state before the polaroid of Polarizer all is identical at each wavelength on light passes; Make LCD show change color still less to the visual angle, thus can be from degree of distribution prediction change color with respect to the polarization state of all wavelengths in the visible region on Poincare polarization ball.That is to say, relatively be shown in the embodiment 1 among Fig. 8 and be shown in the comparative example 1 among Figure 18, can see that the degree of distribution of color in embodiment 1 is little, thereby change color is also little.
In order more specifically to confirm change in color, (CIE 1931, XY) are shown in Fig. 9 and 19 for the chromaticity coordinates of all view directions under black state for embodiment 1 and comparative example's 1 LCD.Shown in Fig. 9 and 19, can find out the remodel change color of LCD of face inscribe that change color according to embodiments of the invention 1 obviously is less than existing comparative example 1.
As stated, from embodiment 1, can find out, as shown in Figure 7 in order to realize effect of the present invention, variation in 550nm short wavelength's polarization state should described here scope (red circle).
The comparative example 2
Although the same with the configuration in embodiment 1, through using general T AC (incident light with respect to 589.3nm has the triacetyl cellulose of Rth as 50nm) to prepare the face inscribe LCD of remodeling to going up of following Polarizer with second compensate film.
The remodel transmittance of all light directions of LCD of this face inscribe is shown among Figure 20, and chromaticity coordinates (CIE 1931, XY) are shown among Figure 21.As a result, compare with embodiment 1, can find out for the transmittance of inclined surface greatlyyer, and change color is also bigger.
The comparative example 3
Although the same with the configuration in embodiment 1, through using isotropy diaphragm (postpone (R0) in the face and be 0nm) to prepare the face inscribe LCD of remodeling as 0nm and thickness direction retardation (Rth) to going up of following Polarizer with second compensate film.
The transmittance of all light directions of this in-plane switching liquid crystal display is shown among Figure 22.As a result, can find out: compare with embodiment 1, the contrast on inclined surface is lower, makes not fogging clear.
The comparative example 4
Although the same with the configuration in embodiment 1, postponing (R0) in the face of first compensate film 24 be 150nm, and refractive index ratio (NZ) be-0.1, and the interior delay of the face of second compensate film 14 (R0) is 250nm, and refractive index ratio (NZ) is-0.7.The summation that postpones in the face of first compensate film 24 and second compensate film 14 is 400nm.
The transmittance of all light directions of this in-plane switching liquid crystal display is shown among Figure 23.As a result, can find out: compare with embodiment 1, the contrast on inclined surface is lower, makes not fogging clear.
Industrial applicibility
It as stated, can be applied to according to in-plane switching liquid crystal display of the present invention in the LCD of the high viewing angle properties of needs, because can provide excellent picture quality to all view directions.
Claims (8)
1. coupling Polarizer assembly, it comprises:
Last Polarizer, it has from top to bottom successively diaphragm, polaroid and first compensate film; With
Following Polarizer, it has from top to bottom successively second compensate film, polaroid and diaphragm,
Wherein, said first compensate film has the refractive index ratio (NZ) that postpones (R0) and-1～-0.01 in the face of 50～200nm, and its slow axis is parallel to the absorption axes of the polaroid in the Polarizer,
Said second compensate film has the interior refractive index ratio (NZ) that postpones (R0) and-2～-0.5 of face of 50～250nm, a absorption axes of waiting a moment perpendicular to the polaroid in the following Polarizer, and
The summation that postpones in the face of said first compensate film and second compensate film is 200～350nm.
2. coupling Polarizer assembly according to claim 1; Wherein, said first compensate film and second compensate film are independently by a kind of the processing that is selected from TAC (triacetyl cellulose), COP (cyclic olefin polymer), COC (cyclic olefine copolymer), PET (polyethylene terephthalate), PP (polypropylene), PC (polycarbonate), PSF (polysulfones) and PMMA (polymethylmethacrylate).
3. coupling Polarizer assembly according to claim 1, wherein, said first compensate film and second compensate film comprise PMMA (polymethylmethacrylate) layer, PS (polystyrene) layer and PMMA (polymethylmethacrylate) layer separately successively.
4. face inscribe LCD of remodeling, it comprises according to each described coupling Polarizer assembly in the claim 1～3.
5. an inscribe according to claim 4 LCD of remodeling, wherein, liquid crystal cell has phase differential (the Δ n * d) of 300～330nm under the wavelength of 589nm.
6. an inscribe according to claim 4 LCD of remodeling, wherein, the direction of orientation of liquid crystal is parallel to the absorption axes of the polaroid in the Polarizer down.
7. an inscribe according to claim 4 LCD of remodeling, wherein, the maximum transmission rate of all view directions is below 0.2% under black mode.
8. an inscribe according to claim 4 LCD of remodeling; Wherein, When the short wavelength's with 550nm light passed each optical layers with the direction of observation of Φ=45 ° and θ=60 °, each polarization state on Poincare polarization ball was in the circle with following radius: said radius is absorbed the distance of the polarization state the absorption axes of polaroid of supreme Polarizer substantially to light wherein for the polarization state after the polaroid that passes Polarizer down from light positive well.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020090025074A KR20100106838A (en) | 2009-03-24 | 2009-03-24 | A laminated polarizer set and in-plane switching mode liquid crystal display comprising the same |
| KR10-2009-0025074 | 2009-03-24 | ||
| PCT/KR2010/001663 WO2010110549A2 (en) | 2009-03-24 | 2010-03-18 | A coupled polarizing plate set and in-plane switching mode liquid crystal display including the same |
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| CN102326118A true CN102326118A (en) | 2012-01-18 |
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| CN201080009021XA Pending CN102326118A (en) | 2009-03-24 | 2010-03-18 | Coupling Polarizer assembly and the face inscribe that comprises this assembly LCD of remodeling |
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| Country | Link |
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| JP (1) | JP5719343B2 (en) |
| KR (1) | KR20100106838A (en) |
| CN (1) | CN102326118A (en) |
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| KR102451590B1 (en) | 2018-11-02 | 2022-10-06 | 주식회사 엘지화학 | Polarizing plates and liquid crystal display devices |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5440413A (en) * | 1991-09-30 | 1995-08-08 | Casio Computer Co., Ltd. | Liquid crystal display device with 2 adjacent biaxial retardation plates having Ny <Nz <Nx |
| WO2004068226A1 (en) * | 2003-01-28 | 2004-08-12 | Lg Chem, Ltd | Bi-axial retardation compensation film and vertically aligned liquid crystal display using the same |
| CN1651997A (en) * | 2004-02-03 | 2005-08-10 | 住友化学株式会社 | Liquid crystal display |
| CN1768295A (en) * | 2003-11-21 | 2006-05-03 | Lg化学株式会社 | In-plane switching liquid crystal display comprising compensation film for angular field of view using positive biaxial retardation film |
| CN101051144A (en) * | 2006-04-04 | 2007-10-10 | 住友化学株式会社 | Liquid crystal display devices and polarizing plate sets used therein |
| CN101271217A (en) * | 2007-02-28 | 2008-09-24 | 住友化学株式会社 | Liquid crystal display apparatus and polarizing panel group |
| US20080309858A1 (en) * | 2007-06-15 | 2008-12-18 | Hitachi Displays, Ltd. | Liquid crystal display device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4333465B2 (en) * | 2004-04-22 | 2009-09-16 | 住友化学株式会社 | Liquid crystal display |
| JP3938923B2 (en) * | 2004-03-26 | 2007-06-27 | 日東電工株式会社 | IPS mode liquid crystal display device |
| US7605895B2 (en) * | 2005-06-14 | 2009-10-20 | Lg Chem, Ltd. | IPS mode liquid crystal display using two sheets of biaxial negative retardation film and a plate |
| KR100767210B1 (en) * | 2005-07-29 | 2007-10-17 | 주식회사 엘지화학 | In-plane switching liquid crystal display having simplified structure |
| JP2008233754A (en) * | 2007-03-23 | 2008-10-02 | Nippon Zeon Co Ltd | Long stretched film, and method of manufacturing the same and its use |
-
2009
- 2009-03-24 KR KR1020090025074A patent/KR20100106838A/en not_active Application Discontinuation
-
2010
- 2010-03-18 JP JP2012501924A patent/JP5719343B2/en active Active
- 2010-03-18 CN CN201080009021XA patent/CN102326118A/en active Pending
- 2010-03-18 WO PCT/KR2010/001663 patent/WO2010110549A2/en active Application Filing
- 2010-03-19 TW TW099108192A patent/TWI546576B/en active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5440413A (en) * | 1991-09-30 | 1995-08-08 | Casio Computer Co., Ltd. | Liquid crystal display device with 2 adjacent biaxial retardation plates having Ny <Nz <Nx |
| WO2004068226A1 (en) * | 2003-01-28 | 2004-08-12 | Lg Chem, Ltd | Bi-axial retardation compensation film and vertically aligned liquid crystal display using the same |
| CN1768295A (en) * | 2003-11-21 | 2006-05-03 | Lg化学株式会社 | In-plane switching liquid crystal display comprising compensation film for angular field of view using positive biaxial retardation film |
| CN1651997A (en) * | 2004-02-03 | 2005-08-10 | 住友化学株式会社 | Liquid crystal display |
| CN101051144A (en) * | 2006-04-04 | 2007-10-10 | 住友化学株式会社 | Liquid crystal display devices and polarizing plate sets used therein |
| CN101271217A (en) * | 2007-02-28 | 2008-09-24 | 住友化学株式会社 | Liquid crystal display apparatus and polarizing panel group |
| US20080309858A1 (en) * | 2007-06-15 | 2008-12-18 | Hitachi Displays, Ltd. | Liquid crystal display device |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104516043A (en) * | 2013-09-26 | 2015-04-15 | 大日本印刷株式会社 | Polarizing plate, image display device, and improvement method of photopic contrast in image display device |
| CN105334672A (en) * | 2015-12-08 | 2016-02-17 | 深圳市华星光电技术有限公司 | Liquid crystal display panel compensation structure and optical compensation method thereof |
| CN108700702B (en) * | 2016-04-14 | 2021-01-08 | 株式会社Lg化学 | Transmittance variable film |
| CN108700702A (en) * | 2016-04-14 | 2018-10-23 | 株式会社Lg化学 | Transmission-variable film |
| CN108700702B9 (en) * | 2016-04-14 | 2021-02-02 | 株式会社Lg化学 | Transmittance variable film |
| CN110873977A (en) * | 2018-08-29 | 2020-03-10 | 群创光电股份有限公司 | Display device |
| CN111566525A (en) * | 2018-10-18 | 2020-08-21 | 株式会社Lg化学 | Polarizing plate, liquid crystal panel and display device |
| US11815759B2 (en) | 2018-10-18 | 2023-11-14 | Lg Chem, Ltd. | Polarizing plate, liquid crystal panel and display device |
| CN113311600A (en) * | 2020-02-26 | 2021-08-27 | 中强光电股份有限公司 | Display device |
| US11614644B2 (en) | 2020-02-26 | 2023-03-28 | Coretronic Corporation | Display device |
| CN113311600B (en) * | 2020-02-26 | 2024-02-06 | 中强光电股份有限公司 | Display device |
| CN111610666A (en) * | 2020-06-24 | 2020-09-01 | 京东方科技集团股份有限公司 | Liquid crystal panel and display device |
| CN111610666B (en) * | 2020-06-24 | 2023-10-13 | 京东方科技集团股份有限公司 | Liquid crystal panel and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010110549A3 (en) | 2011-01-27 |
| JP2012521578A (en) | 2012-09-13 |
| KR20100106838A (en) | 2010-10-04 |
| JP5719343B2 (en) | 2015-05-20 |
| WO2010110549A2 (en) | 2010-09-30 |
| TW201035605A (en) | 2010-10-01 |
| TWI546576B (en) | 2016-08-21 |
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Application publication date: 20120118 |