US20050041297A1 - Electrically actuatable image combiner - Google Patents
Electrically actuatable image combiner Download PDFInfo
- Publication number
- US20050041297A1 US20050041297A1 US10/946,043 US94604304A US2005041297A1 US 20050041297 A1 US20050041297 A1 US 20050041297A1 US 94604304 A US94604304 A US 94604304A US 2005041297 A1 US2005041297 A1 US 2005041297A1
- Authority
- US
- United States
- Prior art keywords
- canceled
- image
- image combiner
- combiner
- liquid crystal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0118—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
Definitions
- the present invention generally relates to heads-up and/or head mounted display devices. This invention more specifically relates to a novel reflective thin film image combiner for the aforementioned devices.
- Helmet mounted displays and windshield mounted displays are increasing in importance in both military and civilian environments.
- a heads-up display presents valuable information to pilots by superposing virtual images of data information over the pilots' normal field of vision.
- the flight parameters of the aircraft, navigational displays or any other relevant information may be viewed without the pilot moving his/her head, thereby generally improving flight performance and safety.
- HUDs are also finding wider usage in civilian transportation, with windshield displays becoming popular in many automobiles. Further, HUDs are beginning to find a wide range of application in the entertainment markets, such as in videos, video games, and virtual reality.
- FIG. 1 A general and basic design for a HUD 20 is shown in FIG. 1 , in which a transparent substrate 22 (e.g. a visor or windshield) includes an image projection system 26 and an image combiner 24 , which together superimpose display information over the user's field of view.
- Image projection system 26 projects optical information (generally in the form of a virtual image) towards image combiner 24 , which is superposed on transparent substrate 22 .
- the virtual image is then reflected towards the user.
- the user may, therefore, view the information provided by image projection system 26 , without turning away from his/her normal field of vision.
- Image projection system 26 generally includes a cathode ray tube (CRT) or a liquid crystal display (LCD) in combination with imaging optics (e.g. mirrors and lenses).
- CTR cathode ray tube
- LCD liquid crystal display
- image combiner 24 is generally designed as a narrow spectrum reflector, (i.e. it reflects light only in a narrow wavelength range and transmits substantially all light at other wavelengths).
- Existing image combiner 24 technologies generally include semi-reflective thin-film deposition coatings, holographic film coatings (see for example Moss in U.S. Pat. No. 4,880,287), or cholesteric liquid crystal based reflective coatings (see for example Berman in U.S. Pat. No. 4,900,133, which is fully incorporated herein by reference).
- image projection system 26 may be designed to project light in a narrow band, matching the reflective band of the image combiner 24 .
- state of the art HUDs are generally limited in that image combiner 24 is passive (i.e. the reflectivity of the coating is constant after fabrication). If, for example, the light intensity of the outside environment is bright the user may find it difficult to read the displayed information over the bright background. Conversely, if the outside environment is dark, and the displayed information is relatively bright, the user may observe reflections of his or her face (as well as other distracting glare) superimposed on the field of view.
- Prior art HUDs attempt to overcome this problem by adjusting the brightness of the CRT or LCD panel in projection system 26 .
- the light intensity range achievable from the projection system 26 tends to be limited and may not always satisfy practical requirements.
- the user may only be required to view the display at intermittent periods.
- One may turn off image projection system 26 to eliminate the display image, however, image combiner 24 remains in the user's field of view and may adversely affect the perception of outside objects, particularly since image combiner 24 is not generally perfectly transmissive.
- the present invention includes an image display system for displaying an image in a user's line of sight, the image display system including: an image projection device; and an image combiner being electrically actuatable between first and second states.
- the image combiner includes at least one cholesteric liquid crystal layer and at least two optically transparent, electrically conductive substrates.
- the reflectivity of the image combiner within a narrow spectrum of wavelengths may be electrically controlled over a range from less than about 10% to greater than about 90%.
- this invention includes an image combiner for a heads up display including: at least one cholesteric liquid crystal layer; at least two optically transparent, electrically conductive substrates; the image combiner being actuatable between first and second states.
- this invention includes a method for fabricating a heads up display system, the method including: providing an image projection device; providing an image combiner including at least one cholesteric liquid crystal layer, wherein the image combiner is electrically actuatable between first and second states; providing a driving circuit; electrically connecting the image combiner with the driving circuit; and locating the image projection device for projecting images on the image combiner.
- this invention includes a method for positioning an image in a user's line of sight, the method including: positioning an image combiner including at least one cholesteric liquid crystal layer in the user's line of sight, the image combiner being electrically actuatable between first and second states; projecting an image to be combined with an image in user's line of sight on the image combiner; and selectively electrically actuating and deactuating the image combiner, wherein actuation of the image combiner from the first state to the second state substantially reduces the brightness of the projected image, and deactuation of the image combiner from the second state to the first state substantially increases the brightness of the projected image.
- FIG. 1 is a schematic representation of a prior art helmet mounted display including an image combiner
- FIG. 2 is a schematic representation of an image display system, including an electrically controllable image combiner, according to one embodiment of the present invention
- FIG. 3 is a schematic representation of a CLC layer including a plurality of molecular sub-layers having aligned molecular orientation
- FIG. 4 illustrates typical reflection and transmission behavior as a function of wavelength for the CLC layer of FIG. 3 ;
- FIG. 5 is a schematic representation of an electrically adjustable CLC device
- FIG. 6 is a plot of reflectivity versus wavelength for the CLC device of FIG. 5 showing a reduction in reflectivity as applied voltage is increased;
- FIG. 7 is a schematic representation of one embodiment of an image combiner of this invention.
- FIG. 8 is a schematic representation of a goggles (or other eyewear) mounted display system in accordance with this invention.
- FIG. 9 is a schematic representation of a windshield display system in accordance with this invention.
- FIG. 10 is a schematic representation of a helmet mounted display system in accordance with this invention.
- System 100 generally includes an image projection device 110 and an image combiner 150 , which may be superposed with a transparent substrate 140 such as a visor or a windshield.
- Image combiner 150 is typically electrically coupled with a driving circuit 120 , having a power supply (not shown).
- Image combiner 150 may include one or more cholesteric liquid crystal (CLC) layers.
- CLC cholesteric liquid crystal
- the reflectivity of image combiner 150 may be electrically adjustable, which as used herein refers to any user selectable variation in reflectivity, ranging from an “on” state (e.g., about 70% reflectivity or more) to an “off” state (e.g., about 30% reflectivity or less) and/or including partial reflectivities therebetween.
- the present invention may be advantageous in that it provides a HUD (e.g. a helmet mounted display or a windshield display) that includes an image combiner 150 having an adjustable reflectivity.
- image combiner 150 may be fabricated to have a high reflectivity (e.g. greater than about 70%) within a narrow spectrum of wavelengths in the non-energized state. However, upon the application of an electric field the reflectivity may be controllably and substantially reduced (e.g. less than about 30% within the same narrow spectrum of wavelengths).
- Image combiner 150 of this invention may be further advantageous in that both the bandwidth and center wavelength of the reflection band may be tuned over a wide wavelength range by adjusting the composition of the CLC material. This invention may be still further advantageous in that it provides for a relatively lightweight, easily integrateable and low cost image combiner.
- conventional image combiners typically fit into one of three categories: semi-reflective thin film combiners, holographic combiners, and CLC-based combiners.
- Semi-reflective image combiners are typically composed of a semi-reflective thin-film metallic coating (e.g. silver or aluminum) superposed on a transparent material (e.g. a visor or windshield).
- a transparent material e.g. a visor or windshield.
- Conventional thin film technology generally relies on vacuum deposition processing, which tends to present difficulties when used on visors and windshields.
- metallic thin-films do not generally adhere well to plastic substrates.
- thin-film coatings tend to reduce the overall amount of light transmitted through a visor or windshield, and therefore may cause a loss in visual acuity and/or color perception.
- multi-layer films are necessary, which tend to increase costs.
- Holographic image combiners are generally composed of diffraction optics (e.g. a photographic emulsion having a diffraction grating recorded thereon) sandwiched between two transparent layers, which provide structural support. Holographic image combiners may be advantageous in that they may be fabricated to reflect light in a narrow wavelength range. However, holographic image combiners do not generally transmit light with an efficiency of greater than 80% and may therefore cause a loss in visual acuity and/or color perception. Further, holographic image combiners typically require laser light to display an image and tend to require expensive equipment for fabrication.
- diffraction optics e.g. a photographic emulsion having a diffraction grating recorded thereon
- Holographic image combiners may be advantageous in that they may be fabricated to reflect light in a narrow wavelength range. However, holographic image combiners do not generally transmit light with an efficiency of greater than 80% and may therefore cause a loss in visual acuity and/or color perception. Further, holographic image combiners typically require
- CLC-based image combiners generally include a CLC layer or layers superposed on a transparent substrate and tend to be advantageous in that they may be fabricated to reflect light in a narrow spectrum of wavelengths with high reflection efficiencies (90% or greater). Such CLC-based image combiners also tend be relatively lightweight, easily integratable, and low cost.
- conventional CLC-based image combiners are passive (i.e. reflectivity is constant after fabrication). As a result, and as described hereinabove, these conventional CLC-based image combiners typically cause a loss of visual acuity in either (or both) bright or dark conditions.
- a CLC film 30 typically includes a stack of thousands of relatively planar molecular sub-layers 33 .
- Each sub-layer includes a plurality of elongated liquid crystal molecules aligned in a common direction within the sub-layer, denoted by c′.
- the molecular sub-layers 33 in turn, stack together so that the orientation of the molecules in each sub-layer 33 is rotated slightly from one sub-layer 33 to the next, forming a continuous helix with an axis of rotation 31 substantially parallel to the z direction.
- a pitch, P 0 of the helix may generally be defined as the stack thickness required for c′ to rotate by 360°.
- CLC films 30 may be formulated with either a right-handed (clockwise) or a left-handed (counter-clockwise) helix, with an axis of rotation 31 that orients substantially perpendicular to the surface of the film. These CLC films 30 are substantially transparent to all wavelengths of electromagnetic radiation (specifically visible light), except within a spectrum of wavelengths (or bandwidth) around a selected center wavelength (e.g. 550 nm).
- a CLC film 30 having a right-handed (clockwise) helix reflects right hand circularly polarized (RH) light and transmits left hand circularly polarized (LH) light
- a CLC film 30 having a left-handed (counterclockwise) helix reflects LH light and transmits RH light.
- the polarizing reflection bandwidth and center wavelength of a CLC film 30 generally depends on the molecular pitch distribution profile of the cholesteric liquid crystals (Li, et al., U.S. Pat. No. 5,691,789 and Li, et al., SID '96 Digest, p. 111 (1996)).
- the Li et al., U.S. patent is fully incorporated herein by reference.
- the bandwidth of the reflection band may be calculated as ⁇ ( ⁇ n/n ave ) ⁇ 0 .
- the bandwidth and center wavelength may generally be engineered by adjusting the composition and processing history of CLC film 30 . In general, the bandwidth may extend from about 20 to about 2000 nanometers.
- a CLC layer having a bandwidth of less than about 100 nm is considered to have a narrow reflection band.
- the optical behavior of a typical CLC film 30 is illustrated schematically in FIG. 4 , wherein reflectivity 38 and transmission 39 are plotted as a function of wavelength, ⁇ 0 .
- CLC device 40 in which the reflective properties may be adjusted electrically is illustrated (CLC device 40 may be used as an image combiner as described hereinbelow).
- CLC device 40 generally includes a CLC layer 44 sandwiched between two conductive, transparent films 42 .
- Indium tin oxide (ITO) is a preferred material for films 42 .
- Films 42 are generally connected to a power supply 46 and may be further sandwiched between transparent (e.g. glass and/or plastic) substrates 41 to provide additional structural integrity.
- CLC layer 44 is similar to that described hereinabove with respect to passive CLC films 30 , but is generally formulated to provide reflective properties that may be electrically adjustable.
- the reflective properties of CLC device 40 may generally be varied by the application of an electric field as shown schematically in FIG. 6 .
- FIG. 6 plots reflectivity versus wavelength, ⁇ 0 , at a function of applied voltage.
- the reflectivity of CLC device 40 is generally about 50% (reflecting either RH or LH light) within a selected spectrum of wavelengths.
- V 1 some threshold voltage
- the reflectivity decreases substantially, as shown.
- this behavior tends to be reversible, wherein upon the removal of the electric field the reflectivity is restored.
- image display system 100 generally includes an image projection device 100 and an image combiner 150 , which may be superposed with a transparent substrate 140 .
- Image projection device 110 may be any type capable of projecting images and/or symbols, which including information content, towards image combiner 150 .
- Image projection device 110 typically includes a cathode ray tube (CRT) or a liquid crystal display (LCD) in combination with imaging optics (not shown).
- CTR cathode ray tube
- LCD liquid crystal display
- Image combiner 150 which is discussed in substantially more detail hereinbelow, may be joined to transparent substrate 140 using any well known technique, such as with an adhesive or a static cling vinyl.
- image combiner 150 is joined to transparent substrate 140 with an optically transparent adhesive, such as those manufactured and sold by Norland Products, Inc., 695 Joyce Kilmer Ave., New Brunswick, N.J., 08902.
- Image combiner 150 is typically electrically coupled to a driving circuit 120 that includes a power supply (not shown).
- the electrical coupling may be made by any known method 125 , but it is generally preferred to use optically transparent electrical conductors so as not to obstruct the user's field of view.
- An optically transparent conductor is indium tin oxide (ITO), which may be deposited as thin wires on the surface of transparent substrate 140 .
- Driving circuit 120 may be located wherever suitable, including on the visor or helmet of a helmet mounted display system, on the dashboard of a motor vehicle, or included with image display device 110 into a singe device having dual function.
- Image display system 100 generally functions similarly to conventional HUDs in that an image projection system 110 projects optical information 112 (generally in the form of a virtual image) towards image combiner 150 .
- the optical information is then reflected back towards a user 105 and is generally superimposed with objects 130 in the user's 105 field of view.
- User 105 may typically view the information provided by image projection system 110 without turning away from his/her normal field of view.
- the image combiner 150 of the present invention is adjustable between at least two discrete reflective states, such as off and on states. For example, in the off state (also referred to as the de-energized state), image combiner 150 has a relatively high reflectivity within a spectrum of wavelengths and therefore reflects a relatively bright image towards user 105 .
- image combiner 150 In the on state (also referred to as the energized state), image combiner 150 has a relatively low reflectivity, and therefore, reflects a relatively faint image towards user 105 .
- actuating image combiner 150 from an “off” state to an “on” state results in a substantial reduction in reflectivity within the reflective spectrum of wavelengths (e.g. from a reflectivity value of greater than about 70% to one that is less than about 30%).
- image combiner 150 may be characterized by having a reflectivity within a spectrum of wavelengths of greater than about 90% in the first state and less than about 10% in the second state. Further, the reflectivity of image combiner 150 may be adjustably disposed in positions between the off and on states described above, to advantageously control the brightness of the image reflected towards user 105 .
- image combiner 150 generally includes first 152 and second 154 CLC layers configured to reflect RH and LH light, respectively.
- Image combiner 150 further includes an optically transparent, electrically conductive interlayer 156 (e.g. an ITO film or a plastic or glass substrate coated on opposite sides with ITO) disposed between CLC layers 152 and 154 .
- Image combiner 150 is otherwise generally similar to CLC device 40 , including two optically transparent, electrically conductive substrates 158 (e.g. ITO or ITO coated glass or plastic substrates) and is electrically connected to one or more power supplies 161 and 162 .
- the voltages to CLC layers 152 , 154 may be controlled individually or in unison.
- CLC layers 152 and 154 are similar to that described hereinabove with respect to passive CLC layer 30 .
- the reflective properties of image combiner 150 may generally be varied by the application of an electric field. Prior to applying a voltage, image combiner 150 is generally highly reflective.
- the unpolarized, incident light 112 may be thought of as including equal parts RH and LH light.
- the RH component 112 R is substantially reflected by right hand CLC layer 152
- the LH component 112 L is substantially reflected by left hand CLC layer 154 .
- an applied voltage of a sufficient magnitude to fully actuate the CLC layers
- the reflectivity of image combiner 150 decreases substantially, and as a result, the incident light 112 is substantially transmitted 113 .
- the reflectivity of image combiner 150 is generally restored.
- suitable CLC materials along with non-reactive, low molecular weight (i.e., a molecular weight generally less than about 5000) liquid crystal materials (and optionally others such as chiral materials) are provided and well mixed.
- Two or more transparent and conductive substrates e.g. ITO substrates or ITO coated glass or plastic substrates
- polyimides typically by the well known process of spin-coating.
- the coated substrates are exposed to a moderately high temperature for a predetermined period of time (for example, when using a polyimide commonly known as ‘polyimide 7311’, the baking procedure would include exposure to 80° C.
- an image combiner having two CLC layers may be fabricated in the foregoing manner by superposing three transparent substrates (with suitable spacers). The above-described material mixture is then disposed between the substrates and the stack exposed to UV radiation for curing of the CLC materials.
- Hikmet et al. in Liq. Cryst., 26, p. 1645-53 (1999), disclose one possible material recipe for image combiner 150 .
- the Hikmet recipe includes 30 wt % chiral acrylate monomer CBC6, 44 wt % BL64 low molecular liquid crystal, 26 wt % chiral material CB15, and 0.6 wt % dia-acrylate monomer C6M.
- CB15 [4′-(2-methylbutyl)-4-cyanobiphenyl] is commercially available and used as a non-reactive chiral dopant in order to be able to choose the position of the reflection at a desired acrylate concentration.
- BL64 is a commercially available mixture containing cyano-biphenyl and -terphenyl compounds available from Merck Ltd. (Poole, UK).
- the chemical compositions of CBC6 and C6M are as shown below: C6M is commercially available, and the skilled artisan will have the ability to synthesize CBC6 in light of the foregoing.
- An image combiner fabricated using the Hikmet CLC material recipe generally includes a reflection band centered at about 540 nm with a bandwidth of about 50 nm. At applied voltages of less than about 32 volts the reflectivity is relatively high (i.e. ‘on’), while at voltages greater than about 34 volts the reflectivity is relatively low (i.e. ‘off’). At applied voltages in the range of about 32 to about 34 volts the reflectivity may be controllably adjusted to levels between the ‘off’ and ‘on’ states.
- System 100 ′ include an electrically controllable image combiner 150 electrically connected by transparent wires 125 (typically ITO) to a driving circuit 120 having a power supply (not shown).
- System 100 ′ may include one or more image combiners 150 .
- system 100 ′ includes two image combiners, one for each of the user's eyes.
- System 100 ′ may also include one image combiner 150 , either centrally located or in the line of sight of one eye.
- An image projection device is not shown, but may be located wherever suitable for proper projection of the display images.
- System 100 ′′ includes an image projection system 110 , often mounted to the dashboard 115 of the motor vehicle.
- System 100 ′′ further includes at least one image combiner 150 disposed on a windshield 140 ′′ and electrically connected by transparent (or thin) wires 125 to a driving circuit 120 having a power supply (not shown).
- Image combiner 150 may include ITO coated plastic substrates 158 (see FIG. 7 ) in order to provide flexibility for fitting the curvature of windshield 140 ′′.
- Driving circuit 120 is typically mounted to dashboard 115 , but may be mounted in any other suitable location (e.g. with any other electronic devices included in the motor vehicle).
- System 100 ′′′ includes an image projection system 110 typically mounted to the helmet 160 .
- System 100 ′′′ further includes at least one image combiner 150 disposed on the visor 140 ′′′ and electrically connected by means of transparent wires to a driving circuit 120 , having a power supply (not shown).
- Image combiner 150 may include ITO coated plastic substrates 158 (see FIG. 7 ) in order to provide flexibility for fitting the curvature of visor 140 ′′′.
- Driving circuit 120 is typically mounted in either visor 140 ′′′ (as shown) or to helmet 160 .
- FIGS. 8-10 illustrate three example HUDs including electrically adjustable image combiners. These are intended to be exemplary, rather than inclusive. Other HUD embodiments including electrically adjustable image combiners are deemed to be within the scope and spirit of this invention.
- the modifications to the various aspects of the present invention described hereinabove are merely exemplary. It is understood that other modifications to the illustrative embodiments will readily occur to persons with ordinary skill in the art. All such modifications and variations are deemed to be within the scope and spirit of the present invention as defined by the accompanying claims.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Instrument Panels (AREA)
- Liquid Crystal (AREA)
Abstract
The present invention is directed to an image display system for displaying an image in a user's line of sight including an image combiner that is electrically actuatable. The image display system generally includes an image projection device, and an electrically actuatable image combiner. The image combiner may be superposed with a transparent substrate such as a visor or a windshield.
Description
- (1) Field of the Invention
- The present invention generally relates to heads-up and/or head mounted display devices. This invention more specifically relates to a novel reflective thin film image combiner for the aforementioned devices.
- (2) Background Information
- Helmet mounted displays and windshield mounted displays (hereafter referred to as heads-up displays or HUDs) are increasing in importance in both military and civilian environments. For example, in a military setting, a heads-up display presents valuable information to pilots by superposing virtual images of data information over the pilots' normal field of vision. The flight parameters of the aircraft, navigational displays or any other relevant information may be viewed without the pilot moving his/her head, thereby generally improving flight performance and safety. HUDs are also finding wider usage in civilian transportation, with windshield displays becoming popular in many automobiles. Further, HUDs are beginning to find a wide range of application in the entertainment markets, such as in videos, video games, and virtual reality.
- A general and basic design for a
HUD 20 is shown inFIG. 1 , in which a transparent substrate 22 (e.g. a visor or windshield) includes animage projection system 26 and an image combiner 24, which together superimpose display information over the user's field of view.Image projection system 26 projects optical information (generally in the form of a virtual image) towards image combiner 24, which is superposed ontransparent substrate 22. The virtual image is then reflected towards the user. The user may, therefore, view the information provided byimage projection system 26, without turning away from his/her normal field of vision.Image projection system 26 generally includes a cathode ray tube (CRT) or a liquid crystal display (LCD) in combination with imaging optics (e.g. mirrors and lenses). - In order to minimize any undesirable distortion to the user's target detection distance and/or color perception,
image combiner 24 is generally designed as a narrow spectrum reflector, (i.e. it reflects light only in a narrow wavelength range and transmits substantially all light at other wavelengths). Existing image combiner 24 technologies generally include semi-reflective thin-film deposition coatings, holographic film coatings (see for example Moss in U.S. Pat. No. 4,880,287), or cholesteric liquid crystal based reflective coatings (see for example Berman in U.S. Pat. No. 4,900,133, which is fully incorporated herein by reference). Furthermore,image projection system 26 may be designed to project light in a narrow band, matching the reflective band of the image combiner 24. - However, despite these advancements, state of the art HUDs are generally limited in that image combiner 24 is passive (i.e. the reflectivity of the coating is constant after fabrication). If, for example, the light intensity of the outside environment is bright the user may find it difficult to read the displayed information over the bright background. Conversely, if the outside environment is dark, and the displayed information is relatively bright, the user may observe reflections of his or her face (as well as other distracting glare) superimposed on the field of view. Prior art HUDs attempt to overcome this problem by adjusting the brightness of the CRT or LCD panel in
projection system 26. However, the light intensity range achievable from theprojection system 26 tends to be limited and may not always satisfy practical requirements. Moreover, for some applications, the user may only be required to view the display at intermittent periods. One may turn offimage projection system 26 to eliminate the display image, however, image combiner 24 remains in the user's field of view and may adversely affect the perception of outside objects, particularly since image combiner 24 is not generally perfectly transmissive. - Therefore, there exists a need for an improved HUD including an improved image combiner 24.
- In one aspect, the present invention includes an image display system for displaying an image in a user's line of sight, the image display system including: an image projection device; and an image combiner being electrically actuatable between first and second states. In one variation of this aspect, the image combiner includes at least one cholesteric liquid crystal layer and at least two optically transparent, electrically conductive substrates. In another variation of this aspect, the reflectivity of the image combiner within a narrow spectrum of wavelengths may be electrically controlled over a range from less than about 10% to greater than about 90%.
- In another aspect, this invention includes an image combiner for a heads up display including: at least one cholesteric liquid crystal layer; at least two optically transparent, electrically conductive substrates; the image combiner being actuatable between first and second states.
- In yet another aspect, this invention includes a method for fabricating a heads up display system, the method including: providing an image projection device; providing an image combiner including at least one cholesteric liquid crystal layer, wherein the image combiner is electrically actuatable between first and second states; providing a driving circuit; electrically connecting the image combiner with the driving circuit; and locating the image projection device for projecting images on the image combiner.
- In still another aspect, this invention includes a method for positioning an image in a user's line of sight, the method including: positioning an image combiner including at least one cholesteric liquid crystal layer in the user's line of sight, the image combiner being electrically actuatable between first and second states; projecting an image to be combined with an image in user's line of sight on the image combiner; and selectively electrically actuating and deactuating the image combiner, wherein actuation of the image combiner from the first state to the second state substantially reduces the brightness of the projected image, and deactuation of the image combiner from the second state to the first state substantially increases the brightness of the projected image.
-
FIG. 1 is a schematic representation of a prior art helmet mounted display including an image combiner; -
FIG. 2 is a schematic representation of an image display system, including an electrically controllable image combiner, according to one embodiment of the present invention; -
FIG. 3 is a schematic representation of a CLC layer including a plurality of molecular sub-layers having aligned molecular orientation; -
FIG. 4 illustrates typical reflection and transmission behavior as a function of wavelength for the CLC layer ofFIG. 3 ; -
FIG. 5 is a schematic representation of an electrically adjustable CLC device; -
FIG. 6 is a plot of reflectivity versus wavelength for the CLC device ofFIG. 5 showing a reduction in reflectivity as applied voltage is increased; -
FIG. 7 is a schematic representation of one embodiment of an image combiner of this invention; -
FIG. 8 is a schematic representation of a goggles (or other eyewear) mounted display system in accordance with this invention; -
FIG. 9 is a schematic representation of a windshield display system in accordance with this invention; and -
FIG. 10 is a schematic representation of a helmet mounted display system in accordance with this invention. - Referring to
FIG. 2 , asystem 100 according to the principles of this invention is illustrated. In general, the present invention is directed to an image display system (i.e. a HUD) including an electrically actuatable image combiner 150.System 100 generally includes animage projection device 110 and an image combiner 150, which may be superposed with atransparent substrate 140 such as a visor or a windshield. Image combiner 150 is typically electrically coupled with adriving circuit 120, having a power supply (not shown). Image combiner 150 may include one or more cholesteric liquid crystal (CLC) layers. In general, the reflectivity of image combiner 150 may be electrically adjustable, which as used herein refers to any user selectable variation in reflectivity, ranging from an “on” state (e.g., about 70% reflectivity or more) to an “off” state (e.g., about 30% reflectivity or less) and/or including partial reflectivities therebetween. - The present invention may be advantageous in that it provides a HUD (e.g. a helmet mounted display or a windshield display) that includes an image combiner 150 having an adjustable reflectivity. For example,
image combiner 150 may be fabricated to have a high reflectivity (e.g. greater than about 70%) within a narrow spectrum of wavelengths in the non-energized state. However, upon the application of an electric field the reflectivity may be controllably and substantially reduced (e.g. less than about 30% within the same narrow spectrum of wavelengths). Image combiner 150 of this invention may be further advantageous in that both the bandwidth and center wavelength of the reflection band may be tuned over a wide wavelength range by adjusting the composition of the CLC material. This invention may be still further advantageous in that it provides for a relatively lightweight, easily integrateable and low cost image combiner. - As mentioned hereinabove, conventional image combiners typically fit into one of three categories: semi-reflective thin film combiners, holographic combiners, and CLC-based combiners. Semi-reflective image combiners are typically composed of a semi-reflective thin-film metallic coating (e.g. silver or aluminum) superposed on a transparent material (e.g. a visor or windshield). Conventional thin film technology generally relies on vacuum deposition processing, which tends to present difficulties when used on visors and windshields. Further, metallic thin-films do not generally adhere well to plastic substrates. Further still, thin-film coatings tend to reduce the overall amount of light transmitted through a visor or windshield, and therefore may cause a loss in visual acuity and/or color perception. In order to achieve narrow band reflective films, multi-layer films are necessary, which tend to increase costs.
- Holographic image combiners are generally composed of diffraction optics (e.g. a photographic emulsion having a diffraction grating recorded thereon) sandwiched between two transparent layers, which provide structural support. Holographic image combiners may be advantageous in that they may be fabricated to reflect light in a narrow wavelength range. However, holographic image combiners do not generally transmit light with an efficiency of greater than 80% and may therefore cause a loss in visual acuity and/or color perception. Further, holographic image combiners typically require laser light to display an image and tend to require expensive equipment for fabrication.
- Conventional CLC-based image combiners generally include a CLC layer or layers superposed on a transparent substrate and tend to be advantageous in that they may be fabricated to reflect light in a narrow spectrum of wavelengths with high reflection efficiencies (90% or greater). Such CLC-based image combiners also tend be relatively lightweight, easily integratable, and low cost. However, as described hereinabove, conventional CLC-based image combiners are passive (i.e. reflectivity is constant after fabrication). As a result, and as described hereinabove, these conventional CLC-based image combiners typically cause a loss of visual acuity in either (or both) bright or dark conditions.
- In order to enable a comprehensive understanding of the structure and function of the present invention, a description of CLC layers and electrically actuatable CLC layers is provided, followed by a description of the HUDs of this invention.
- Referring now to
FIG. 3 , a CLC film 30 (also referred to as a CLC layer) typically includes a stack of thousands of relatively planarmolecular sub-layers 33. Each sub-layer includes a plurality of elongated liquid crystal molecules aligned in a common direction within the sub-layer, denoted by c′. Themolecular sub-layers 33 in turn, stack together so that the orientation of the molecules in each sub-layer 33 is rotated slightly from onesub-layer 33 to the next, forming a continuous helix with an axis ofrotation 31 substantially parallel to the z direction. A pitch, P0, of the helix may generally be defined as the stack thickness required for c′ to rotate by 360°. -
CLC films 30 may be formulated with either a right-handed (clockwise) or a left-handed (counter-clockwise) helix, with an axis ofrotation 31 that orients substantially perpendicular to the surface of the film. TheseCLC films 30 are substantially transparent to all wavelengths of electromagnetic radiation (specifically visible light), except within a spectrum of wavelengths (or bandwidth) around a selected center wavelength (e.g. 550 nm). Within that spectrum of wavelengths, aCLC film 30 having a right-handed (clockwise) helix reflects right hand circularly polarized (RH) light and transmits left hand circularly polarized (LH) light, while aCLC film 30 having a left-handed (counterclockwise) helix reflects LH light and transmits RH light. - The polarizing reflection bandwidth and center wavelength of a
CLC film 30 generally depends on the molecular pitch distribution profile of the cholesteric liquid crystals (Li, et al., U.S. Pat. No. 5,691,789 and Li, et al., SID '96 Digest, p. 111 (1996)). The Li et al., U.S. patent is fully incorporated herein by reference. ACLC film 30 including a right-handed helical pitch P0 and average index of refraction nave generally reflects RH light at a characteristic wavelength λ0=naveP0, and transmits LH light at this wavelength. The bandwidth of the reflection band may be calculated as Δλ≈(Δn/nave)λ0. where Δn=ne−no is the birefringence of the film. The bandwidth and center wavelength may generally be engineered by adjusting the composition and processing history ofCLC film 30. In general, the bandwidth may extend from about 20 to about 2000 nanometers. As used throughout, a CLC layer having a bandwidth of less than about 100 nm is considered to have a narrow reflection band. The optical behavior of atypical CLC film 30 is illustrated schematically inFIG. 4 , whereinreflectivity 38 andtransmission 39 are plotted as a function of wavelength, λ0. -
Conventional CLC films 30 tend to be passive, in the sense that the above-described helical structure is fixed, and therefore, the optical properties of the film may generally not be varied by the application of an electrical field. However, recently Li et al., in U.S. patent application Ser. No. 09/093,017, and Hikmet, in U.S. Pat. No. 5,798,057 and Liq. Cryst., 26, p. 1645-53 (1999), have disclosed CLC films in which the optical properties (e.g. the reflectivity as a function of optical wavelength) may be adjusted electrically. The Li et al., patent application and the Hikmet patent and article are fully incorporated herein by reference. - Referring now to
FIG. 5 , the basic structure of aCLC device 40 in which the reflective properties may be adjusted electrically is illustrated (CLC device 40 may be used as an image combiner as described hereinbelow).CLC device 40 generally includes aCLC layer 44 sandwiched between two conductive,transparent films 42. Indium tin oxide (ITO) is a preferred material forfilms 42.Films 42 are generally connected to apower supply 46 and may be further sandwiched between transparent (e.g. glass and/or plastic) substrates 41 to provide additional structural integrity.CLC layer 44 is similar to that described hereinabove with respect topassive CLC films 30, but is generally formulated to provide reflective properties that may be electrically adjustable. The reflective properties ofCLC device 40 may generally be varied by the application of an electric field as shown schematically inFIG. 6 .FIG. 6 plots reflectivity versus wavelength, λ0, at a function of applied voltage. At applied voltages less than some threshold voltage, (e.g. V1) , the reflectivity ofCLC device 40 is generally about 50% (reflecting either RH or LH light) within a selected spectrum of wavelengths. As the applied voltage is increased (V5>V4>V3>V2>V1), the reflectivity decreases substantially, as shown. Moreover, this behavior tends to be reversible, wherein upon the removal of the electric field the reflectivity is restored. - Referring again to
FIG. 2 , and as described briefly hereinabove,image display system 100 generally includes animage projection device 100 and animage combiner 150, which may be superposed with atransparent substrate 140.Image projection device 110 may be any type capable of projecting images and/or symbols, which including information content, towardsimage combiner 150.Image projection device 110 typically includes a cathode ray tube (CRT) or a liquid crystal display (LCD) in combination with imaging optics (not shown).Image combiner 150, which is discussed in substantially more detail hereinbelow, may be joined totransparent substrate 140 using any well known technique, such as with an adhesive or a static cling vinyl. In one embodiment,image combiner 150 is joined totransparent substrate 140 with an optically transparent adhesive, such as those manufactured and sold by Norland Products, Inc., 695 Joyce Kilmer Ave., New Brunswick, N.J., 08902.Image combiner 150 is typically electrically coupled to adriving circuit 120 that includes a power supply (not shown). The electrical coupling may be made by any knownmethod 125, but it is generally preferred to use optically transparent electrical conductors so as not to obstruct the user's field of view. One example of an optically transparent conductor is indium tin oxide (ITO), which may be deposited as thin wires on the surface oftransparent substrate 140. Drivingcircuit 120 may be located wherever suitable, including on the visor or helmet of a helmet mounted display system, on the dashboard of a motor vehicle, or included withimage display device 110 into a singe device having dual function. -
Image display system 100 generally functions similarly to conventional HUDs in that animage projection system 110 projects optical information 112 (generally in the form of a virtual image) towardsimage combiner 150. The optical information is then reflected back towards auser 105 and is generally superimposed withobjects 130 in the user's 105 field of view.User 105 may typically view the information provided byimage projection system 110 without turning away from his/her normal field of view. As discussed hereinabove, theimage combiner 150 of the present invention is adjustable between at least two discrete reflective states, such as off and on states. For example, in the off state (also referred to as the de-energized state),image combiner 150 has a relatively high reflectivity within a spectrum of wavelengths and therefore reflects a relatively bright image towardsuser 105. In the on state (also referred to as the energized state),image combiner 150 has a relatively low reflectivity, and therefore, reflects a relatively faint image towardsuser 105. In general, actuatingimage combiner 150 from an “off” state to an “on” state results in a substantial reduction in reflectivity within the reflective spectrum of wavelengths (e.g. from a reflectivity value of greater than about 70% to one that is less than about 30%). In a particular exemplary embodiment,image combiner 150 may be characterized by having a reflectivity within a spectrum of wavelengths of greater than about 90% in the first state and less than about 10% in the second state. Further, the reflectivity ofimage combiner 150 may be adjustably disposed in positions between the off and on states described above, to advantageously control the brightness of the image reflected towardsuser 105. - Referring now to
FIG. 7 ,image combiner 150 generally includes first 152 and second 154 CLC layers configured to reflect RH and LH light, respectively.Image combiner 150 further includes an optically transparent, electrically conductive interlayer 156 (e.g. an ITO film or a plastic or glass substrate coated on opposite sides with ITO) disposed betweenCLC layers Image combiner 150 is otherwise generally similar toCLC device 40, including two optically transparent, electrically conductive substrates 158 (e.g. ITO or ITO coated glass or plastic substrates) and is electrically connected to one ormore power supplies CLC layers passive CLC layer 30. The reflective properties ofimage combiner 150 may generally be varied by the application of an electric field. Prior to applying a voltage,image combiner 150 is generally highly reflective. - In general, the unpolarized,
incident light 112 may be thought of as including equal parts RH and LH light. TheRH component 112R is substantially reflected by righthand CLC layer 152, while theLH component 112L is substantially reflected by lefthand CLC layer 154. Upon the application of an applied voltage (of a sufficient magnitude to fully actuate the CLC layers) toCLC layers image combiner 150 decreases substantially, and as a result, theincident light 112 is substantially transmitted 113. Upon the removal of the electric field, the reflectivity ofimage combiner 150 is generally restored. - Fabrication of
image combiner 150 is now described. In an exemplary fabrication process, suitable CLC materials along with non-reactive, low molecular weight (i.e., a molecular weight generally less than about 5000) liquid crystal materials (and optionally others such as chiral materials) are provided and well mixed. Two or more transparent and conductive substrates (e.g. ITO substrates or ITO coated glass or plastic substrates) are coated with polyimides (typically by the well known process of spin-coating). After a baking process, in which the coated substrates are exposed to a moderately high temperature for a predetermined period of time (for example, when using a polyimide commonly known as ‘polyimide 7311’, the baking procedure would include exposure to 80° C. for 15 minutes, followed by 180° C. for 60 minutes), the substrates are rubbed undirectionally. The substrates are then superposed with suitable spacers between them to control the thickness of the CLC layer(s). Optionally, an image combiner having two CLC layers (as illustrated inFIG. 7 ) may be fabricated in the foregoing manner by superposing three transparent substrates (with suitable spacers). The above-described material mixture is then disposed between the substrates and the stack exposed to UV radiation for curing of the CLC materials. - Hikmet et al., in Liq. Cryst., 26, p. 1645-53 (1999), disclose one possible material recipe for image combiner 150. The Hikmet recipe includes 30 wt % chiral acrylate monomer CBC6, 44 wt % BL64 low molecular liquid crystal, 26 wt % chiral material CB15, and 0.6 wt % dia-acrylate monomer C6M. CB15 [4′-(2-methylbutyl)-4-cyanobiphenyl] is commercially available and used as a non-reactive chiral dopant in order to be able to choose the position of the reflection at a desired acrylate concentration. According to the previously mentioned literature, BL64 is a commercially available mixture containing cyano-biphenyl and -terphenyl compounds available from Merck Ltd. (Poole, UK). The chemical compositions of CBC6 and C6M are as shown below:
C6M is commercially available, and the skilled artisan will have the ability to synthesize CBC6 in light of the foregoing. - An image combiner fabricated using the Hikmet CLC material recipe generally includes a reflection band centered at about 540 nm with a bandwidth of about 50 nm. At applied voltages of less than about 32 volts the reflectivity is relatively high (i.e. ‘on’), while at voltages greater than about 34 volts the reflectivity is relatively low (i.e. ‘off’). At applied voltages in the range of about 32 to about 34 volts the reflectivity may be controllably adjusted to levels between the ‘off’ and ‘on’ states.
- Referring to
FIG. 8 , a goggles mounteddisplay system 100′ in accordance with this invention is illustrated.System 100′ include an electricallycontrollable image combiner 150 electrically connected by transparent wires 125 (typically ITO) to adriving circuit 120 having a power supply (not shown).System 100′ may include one ormore image combiners 150. As illustrated inFIG. 8A ,system 100′ includes two image combiners, one for each of the user's eyes.System 100′ may also include oneimage combiner 150, either centrally located or in the line of sight of one eye. An image projection device is not shown, but may be located wherever suitable for proper projection of the display images. - Referring to
FIG. 9 , awindshield display system 100″ in accordance with this invention is illustrated.System 100″ includes animage projection system 110, often mounted to thedashboard 115 of the motor vehicle.System 100″ further includes at least oneimage combiner 150 disposed on awindshield 140″ and electrically connected by transparent (or thin)wires 125 to adriving circuit 120 having a power supply (not shown).Image combiner 150 may include ITO coated plastic substrates 158 (seeFIG. 7 ) in order to provide flexibility for fitting the curvature ofwindshield 140″. Drivingcircuit 120 is typically mounted todashboard 115, but may be mounted in any other suitable location (e.g. with any other electronic devices included in the motor vehicle). - Referring to
FIG. 10 , a helmet mounteddisplay system 100′″ according to this invention is illustrated.System 100′″ includes animage projection system 110 typically mounted to thehelmet 160.System 100′″ further includes at least oneimage combiner 150 disposed on thevisor 140′″ and electrically connected by means of transparent wires to adriving circuit 120, having a power supply (not shown).Image combiner 150 may include ITO coated plastic substrates 158 (seeFIG. 7 ) in order to provide flexibility for fitting the curvature ofvisor 140′″. Drivingcircuit 120 is typically mounted in eithervisor 140′″ (as shown) or tohelmet 160. -
FIGS. 8-10 illustrate three example HUDs including electrically adjustable image combiners. These are intended to be exemplary, rather than inclusive. Other HUD embodiments including electrically adjustable image combiners are deemed to be within the scope and spirit of this invention. In addition, the modifications to the various aspects of the present invention described hereinabove are merely exemplary. It is understood that other modifications to the illustrative embodiments will readily occur to persons with ordinary skill in the art. All such modifications and variations are deemed to be within the scope and spirit of the present invention as defined by the accompanying claims.
Claims (46)
1. (Canceled)
2. (Canceled)
3. (Canceled)
4. (Canceled)
5. (Canceled)
6. (Canceled)
7. (Canceled)
8. (Canceled)
9. (Canceled)
10. (Canceled)
11. (Canceled)
12. (Canceled)
13. (Canceled)
14. (Canceled)
15. (Canceled)
16. (Canceled)
17. (Canceled)
18. (Canceled)
19. (Canceled)
20. (Canceled)
21. (Canceled)
22. (Canceled)
23. (Canceled)
24. (Canceled)
25. (Canceled)
26. (Canceled)
27. (Canceled)
28. (Canceled)
29. (Canceled)
30. (Canceled)
31. (Canceled)
32. An image combiner for a heads up display comprising:
at least one cholesteric liquid crystal layer;
at least two optically transparent, electrically conductive substrates; and
said image combiner being actuatable between first and second states.
33. The image combiner of claim 32 wherein said at least one cholesteric liquid crystal layer comprises a mixture of a cholesteric liquid crystal material and another liquid crystal material having a molecular weight of less than about 5000.
34. The image combiner of claim 33 wherein said at least one cholesteric liquid crystal layer comprises a mixture of a first material, a second material and a third material, said first material being a cholesteric liquid crystal material, said second material being a liquid crystal material having a molecular weight of less than about 5000, and said third material being a chiral material.
35. The image combiner of claim 32 having a reflection band with a center wavelength of about 540 nm and a bandwidth of less than about 100 nm.
36. The image combiner of claim 32 comprising two cholesteric liquid crystal layers with an optically transparent, electrically conductive interlayer disposed therebetween.
37. The image combiner of claim 36 wherein said two cholesteric liquid crystal layers are disposed between two of said at least two optically transparent, electrically conductive substrates.
38. The image combiner of claim 37 wherein said at least two optically transparent, electrically conductive substrates and said interlayer each comprise indium tin oxide.
39. The image combiner of claim 32 wherein said at least two optically transparent, electrically conductive substrates each comprise an indium tin oxide coated glass substrate.
40. The image combiner of claim 32 wherein said at least two optically transparent, electrically conductive substrates each comprise an indium tin oxide coated plastic substrate.
41. The image combiner of claim 32 having a reflectivity within a narrow spectrum of wavelengths greater than about 90% when said image combiner is disposed in said first state.
42. The image combiner of claim 32 having a reflectivity within a narrow spectrum of wavelengths less than about 10% when said image combiner is disposed in said second state.
43. The image combiner of claim 32 wherein the reflectivity within a narrow spectrum of wavelengths may be electrically controlled over a range from less than about 10% to greater than about 90%.
44. A method for fabricating a heads up display system, said method comprising:
providing an image projection device;
providing an image combiner including at least one cholesteric liquid crystal layer, said image combiner being electrically actuatable between first and second states;
providing a driving circuit;
electrically connecting said image combiner with said driving circuit; and
locating said image projection device for projecting images on said image combiner.
45. A method for positioning an image in a user's line of sight, said method comprising:
positioning an image combiner including at least one cholesteric liquid crystal layer in the user's line of sight, said image combiner being electrically actuatable between first and second states;
projecting an image to be combined with an image in user's line of sight on said image combiner; and
selectively electrically actuating and deactuating said image combiner, wherein actuation of said image combiner from said first state to said second state substantially reduces the brightness of the projected image, and deactuation of said image combiner from said second state to said first state substantially increases the brightness of the projected image.
46. The method of claim 45 wherein said electrically actuating and deactuating said image combiner further comprises electrically controlling the brightness of the projected image.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/946,043 US20050041297A1 (en) | 2001-04-23 | 2004-09-21 | Electrically actuatable image combiner |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US28585001P | 2001-04-23 | 2001-04-23 | |
US10/128,675 US6844980B2 (en) | 2001-04-23 | 2002-04-23 | Image display system and electrically actuatable image combiner therefor |
US10/946,043 US20050041297A1 (en) | 2001-04-23 | 2004-09-21 | Electrically actuatable image combiner |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/128,675 Division US6844980B2 (en) | 2001-04-23 | 2002-04-23 | Image display system and electrically actuatable image combiner therefor |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050041297A1 true US20050041297A1 (en) | 2005-02-24 |
Family
ID=23095965
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/128,675 Expired - Fee Related US6844980B2 (en) | 2001-04-23 | 2002-04-23 | Image display system and electrically actuatable image combiner therefor |
US10/946,043 Abandoned US20050041297A1 (en) | 2001-04-23 | 2004-09-21 | Electrically actuatable image combiner |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/128,675 Expired - Fee Related US6844980B2 (en) | 2001-04-23 | 2002-04-23 | Image display system and electrically actuatable image combiner therefor |
Country Status (3)
Country | Link |
---|---|
US (2) | US6844980B2 (en) |
TW (1) | TWI233500B (en) |
WO (1) | WO2002086591A1 (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050012682A1 (en) * | 2003-07-17 | 2005-01-20 | Jenson Barton James | Visual display system for displaying virtual images onto a field of vision |
US20110050548A1 (en) * | 2008-03-04 | 2011-03-03 | Elbit Systems Electro Optics Elop Ltd. | Head up display utilizing an lcd and a diffuser |
US8876285B2 (en) | 2006-12-14 | 2014-11-04 | Oakley, Inc. | Wearable high resolution audio visual interface |
US9429757B1 (en) * | 2013-11-09 | 2016-08-30 | Jonathan Peeri | System for providing projected information combined with outside scenery |
US9451068B2 (en) | 2001-06-21 | 2016-09-20 | Oakley, Inc. | Eyeglasses with electronic components |
US9470893B2 (en) | 2012-10-11 | 2016-10-18 | Sony Computer Entertainment Europe Limited | Head mountable device |
US9619201B2 (en) | 2000-06-02 | 2017-04-11 | Oakley, Inc. | Eyewear with detachable adjustable electronics module |
WO2017115081A1 (en) * | 2015-12-30 | 2017-07-06 | Daqri Holographics Ltd | Near eye dynamic holography |
US9720258B2 (en) | 2013-03-15 | 2017-08-01 | Oakley, Inc. | Electronic ornamentation for eyewear |
US9720231B2 (en) | 2012-09-26 | 2017-08-01 | Dolby Laboratories Licensing Corporation | Display, imaging system and controller for eyewear display device |
US9720260B2 (en) | 2013-06-12 | 2017-08-01 | Oakley, Inc. | Modular heads-up display system |
US20180081173A1 (en) * | 2015-04-02 | 2018-03-22 | Continental Automotive Gmbh | Head-Up Display |
US10222617B2 (en) | 2004-12-22 | 2019-03-05 | Oakley, Inc. | Wearable electronically enabled interface system |
EP3380886B1 (en) * | 2015-11-25 | 2022-06-15 | Continental Automotive Systems, Inc. | Display system adjustable based on the brightness of the background |
Families Citing this family (97)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003026275A2 (en) | 2001-09-19 | 2003-03-27 | Meta Tv, Inc. | Interactive user interface for television applications |
US8413205B2 (en) | 2001-09-19 | 2013-04-02 | Tvworks, Llc | System and method for construction, delivery and display of iTV content |
US8042132B2 (en) | 2002-03-15 | 2011-10-18 | Tvworks, Llc | System and method for construction, delivery and display of iTV content |
US11388451B2 (en) | 2001-11-27 | 2022-07-12 | Comcast Cable Communications Management, Llc | Method and system for enabling data-rich interactive television using broadcast database |
US6839180B2 (en) * | 2002-03-05 | 2005-01-04 | Yazaki Corporation | Combiner and on-vehicle display unit including the same |
US7703116B1 (en) | 2003-07-11 | 2010-04-20 | Tvworks, Llc | System and method for construction, delivery and display of iTV applications that blend programming information of on-demand and broadcast service offerings |
US8707354B1 (en) | 2002-06-12 | 2014-04-22 | Tvworks, Llc | Graphically rich, modular, promotional tile interface for interactive television |
US7197715B1 (en) * | 2002-03-29 | 2007-03-27 | Digeo, Inc. | System and method to provide customized graphical user interfaces via an interactive video casting network |
US8352983B1 (en) | 2002-07-11 | 2013-01-08 | Tvworks, Llc | Programming contextual interactive user interface for television |
US11070890B2 (en) | 2002-08-06 | 2021-07-20 | Comcast Cable Communications Management, Llc | User customization of user interfaces for interactive television |
US8220018B2 (en) | 2002-09-19 | 2012-07-10 | Tvworks, Llc | System and method for preferred placement programming of iTV content |
US8578411B1 (en) | 2003-03-14 | 2013-11-05 | Tvworks, Llc | System and method for controlling iTV application behaviors through the use of application profile filters |
US10664138B2 (en) | 2003-03-14 | 2020-05-26 | Comcast Cable Communications, Llc | Providing supplemental content for a second screen experience |
US11381875B2 (en) | 2003-03-14 | 2022-07-05 | Comcast Cable Communications Management, Llc | Causing display of user-selectable content types |
US8819734B2 (en) | 2003-09-16 | 2014-08-26 | Tvworks, Llc | Contextual navigational control for digital television |
US20060055786A1 (en) * | 2004-03-09 | 2006-03-16 | Viosport | Portable camera and wiring harness |
US20050200750A1 (en) * | 2004-03-09 | 2005-09-15 | Ollila David J. | Portable camera and wiring harness |
US7818667B2 (en) | 2005-05-03 | 2010-10-19 | Tv Works Llc | Verification of semantic constraints in multimedia data and in its announcement, signaling and interchange |
GB0718706D0 (en) | 2007-09-25 | 2007-11-07 | Creative Physics Ltd | Method and apparatus for reducing laser speckle |
US7719749B1 (en) * | 2007-11-29 | 2010-05-18 | Oasis Advanced Engineering, Inc. | Multi-purpose periscope with display and overlay capabilities |
US8264770B2 (en) | 2007-11-29 | 2012-09-11 | Oasis Advanced Engineering, Inc. | Multi-purpose periscope with display and overlay capabilities |
US8023195B2 (en) | 2008-10-23 | 2011-09-20 | Gentex Corporation | Split laser eye protection system |
US11832024B2 (en) * | 2008-11-20 | 2023-11-28 | Comcast Cable Communications, Llc | Method and apparatus for delivering video and video-related content at sub-asset level |
US20100186152A1 (en) * | 2009-01-24 | 2010-07-29 | Phillip Freeman | Light Attenuating Shield for a Motorcycle Helmet Visor |
US11726332B2 (en) | 2009-04-27 | 2023-08-15 | Digilens Inc. | Diffractive projection apparatus |
US9335604B2 (en) | 2013-12-11 | 2016-05-10 | Milan Momcilo Popovich | Holographic waveguide display |
US8233204B1 (en) | 2009-09-30 | 2012-07-31 | Rockwell Collins, Inc. | Optical displays |
US11320571B2 (en) | 2012-11-16 | 2022-05-03 | Rockwell Collins, Inc. | Transparent waveguide display providing upper and lower fields of view with uniform light extraction |
US10795160B1 (en) | 2014-09-25 | 2020-10-06 | Rockwell Collins, Inc. | Systems for and methods of using fold gratings for dual axis expansion |
US11300795B1 (en) | 2009-09-30 | 2022-04-12 | Digilens Inc. | Systems for and methods of using fold gratings coordinated with output couplers for dual axis expansion |
US8659826B1 (en) | 2010-02-04 | 2014-02-25 | Rockwell Collins, Inc. | Worn display system and method without requiring real time tracking for boresight precision |
US8376548B2 (en) | 2010-09-22 | 2013-02-19 | Vuzix Corporation | Near-eye display with on-axis symmetry |
JP5661786B2 (en) * | 2010-10-01 | 2015-01-28 | パナソニックIpマネジメント株式会社 | Display device, moving body and control device |
WO2012136970A1 (en) | 2011-04-07 | 2012-10-11 | Milan Momcilo Popovich | Laser despeckler based on angular diversity |
US9112623B2 (en) | 2011-06-06 | 2015-08-18 | Comcast Cable Communications, Llc | Asynchronous interaction at specific points in content |
US10670876B2 (en) | 2011-08-24 | 2020-06-02 | Digilens Inc. | Waveguide laser illuminator incorporating a despeckler |
WO2016020630A2 (en) | 2014-08-08 | 2016-02-11 | Milan Momcilo Popovich | Waveguide laser illuminator incorporating a despeckler |
US20140204455A1 (en) | 2011-08-24 | 2014-07-24 | Milan Momcilo Popovich | Wearable data display |
US9507150B1 (en) | 2011-09-30 | 2016-11-29 | Rockwell Collins, Inc. | Head up display (HUD) using a bent waveguide assembly |
US9715067B1 (en) | 2011-09-30 | 2017-07-25 | Rockwell Collins, Inc. | Ultra-compact HUD utilizing waveguide pupil expander with surface relief gratings in high refractive index materials |
US8634139B1 (en) | 2011-09-30 | 2014-01-21 | Rockwell Collins, Inc. | System for and method of catadioptric collimation in a compact head up display (HUD) |
US9366864B1 (en) | 2011-09-30 | 2016-06-14 | Rockwell Collins, Inc. | System for and method of displaying information without need for a combiner alignment detector |
WO2013102759A2 (en) | 2012-01-06 | 2013-07-11 | Milan Momcilo Popovich | Contact image sensor using switchable bragg gratings |
US9523852B1 (en) | 2012-03-28 | 2016-12-20 | Rockwell Collins, Inc. | Micro collimator system and method for a head up display (HUD) |
EP2842003B1 (en) | 2012-04-25 | 2019-02-27 | Rockwell Collins, Inc. | Holographic wide angle display |
FR2994748B1 (en) * | 2012-08-21 | 2016-11-25 | Commissariat Energie Atomique | HIGH COMPACT HEAD SCREW |
US11115722B2 (en) | 2012-11-08 | 2021-09-07 | Comcast Cable Communications, Llc | Crowdsourcing supplemental content |
US9933684B2 (en) | 2012-11-16 | 2018-04-03 | Rockwell Collins, Inc. | Transparent waveguide display providing upper and lower fields of view having a specific light output aperture configuration |
WO2014141918A1 (en) * | 2013-03-11 | 2014-09-18 | コニカミノルタ株式会社 | Wearable computer |
US9553927B2 (en) | 2013-03-13 | 2017-01-24 | Comcast Cable Communications, Llc | Synchronizing multiple transmissions of content |
US10880609B2 (en) | 2013-03-14 | 2020-12-29 | Comcast Cable Communications, Llc | Content event messaging |
US9674413B1 (en) | 2013-04-17 | 2017-06-06 | Rockwell Collins, Inc. | Vision system and method having improved performance and solar mitigation |
US9727772B2 (en) | 2013-07-31 | 2017-08-08 | Digilens, Inc. | Method and apparatus for contact image sensing |
TWI490544B (en) * | 2013-08-23 | 2015-07-01 | Shinyoptics Corp | Hat-type head up display |
US9244281B1 (en) | 2013-09-26 | 2016-01-26 | Rockwell Collins, Inc. | Display system and method using a detached combiner |
FR3013462B1 (en) * | 2013-11-18 | 2017-06-09 | Commissariat Energie Atomique | SYSTEM FOR DISPLAYING AN IMAGE ON A WINDSHIELD |
US10732407B1 (en) | 2014-01-10 | 2020-08-04 | Rockwell Collins, Inc. | Near eye head up display system and method with fixed combiner |
US9519089B1 (en) | 2014-01-30 | 2016-12-13 | Rockwell Collins, Inc. | High performance volume phase gratings |
FR3018929B1 (en) | 2014-03-21 | 2017-07-07 | Thales Sa | VISUALIZATION DEVICE COMPRISING A VARIABLE REFLECTION RATE COMBINER |
US9244280B1 (en) | 2014-03-25 | 2016-01-26 | Rockwell Collins, Inc. | Near eye display system and method for display enhancement or redundancy |
WO2016020632A1 (en) | 2014-08-08 | 2016-02-11 | Milan Momcilo Popovich | Method for holographic mastering and replication |
US10241330B2 (en) | 2014-09-19 | 2019-03-26 | Digilens, Inc. | Method and apparatus for generating input images for holographic waveguide displays |
US9715110B1 (en) | 2014-09-25 | 2017-07-25 | Rockwell Collins, Inc. | Automotive head up display (HUD) |
US10088675B1 (en) | 2015-05-18 | 2018-10-02 | Rockwell Collins, Inc. | Turning light pipe for a pupil expansion system and method |
IL235088A (en) * | 2014-10-07 | 2017-06-29 | Elbit Systems Ltd | Helmet system having adjustable light transmission |
US11783382B2 (en) | 2014-10-22 | 2023-10-10 | Comcast Cable Communications, Llc | Systems and methods for curating content metadata |
CN111323867A (en) | 2015-01-12 | 2020-06-23 | 迪吉伦斯公司 | Environmentally isolated waveguide display |
US20160223818A1 (en) * | 2015-02-04 | 2016-08-04 | Panasonic Intellectual Property Management Co., Ltd. | Image display device |
US9632226B2 (en) | 2015-02-12 | 2017-04-25 | Digilens Inc. | Waveguide grating device |
JP2016153281A (en) * | 2015-02-20 | 2016-08-25 | 富士フイルム株式会社 | Windshield glass and head-up display system |
US10247943B1 (en) | 2015-05-18 | 2019-04-02 | Rockwell Collins, Inc. | Head up display (HUD) using a light pipe |
US11366316B2 (en) | 2015-05-18 | 2022-06-21 | Rockwell Collins, Inc. | Head up display (HUD) using a light pipe |
US10126552B2 (en) | 2015-05-18 | 2018-11-13 | Rockwell Collins, Inc. | Micro collimator system and method for a head up display (HUD) |
US10108010B2 (en) | 2015-06-29 | 2018-10-23 | Rockwell Collins, Inc. | System for and method of integrating head up displays and head down displays |
JP6598269B2 (en) | 2015-10-05 | 2019-10-30 | ディジレンズ インコーポレイテッド | Waveguide display |
US10598932B1 (en) | 2016-01-06 | 2020-03-24 | Rockwell Collins, Inc. | Head up display for integrating views of conformally mapped symbols and a fixed image source |
JP6895451B2 (en) | 2016-03-24 | 2021-06-30 | ディジレンズ インコーポレイテッド | Methods and Devices for Providing Polarized Selective Holography Waveguide Devices |
EP3433658B1 (en) | 2016-04-11 | 2023-08-09 | DigiLens, Inc. | Holographic waveguide apparatus for structured light projection |
US10623722B2 (en) | 2016-05-13 | 2020-04-14 | Microsoft Technology Licensing, Llc | Head-up multiplex display with redirection optic |
US11513350B2 (en) | 2016-12-02 | 2022-11-29 | Digilens Inc. | Waveguide device with uniform output illumination |
US10545346B2 (en) | 2017-01-05 | 2020-01-28 | Digilens Inc. | Wearable heads up displays |
US10295824B2 (en) | 2017-01-26 | 2019-05-21 | Rockwell Collins, Inc. | Head up display with an angled light pipe |
US10634359B2 (en) * | 2017-06-02 | 2020-04-28 | Howard Birnbaum | Fireplace cavity insert |
CN107561706B (en) * | 2017-09-16 | 2021-04-16 | 中创博利科技控股有限公司 | Virtual reality projection imaging system |
CN107490867B (en) * | 2017-10-07 | 2021-05-11 | 深圳市狮子汇文化传播有限公司 | Virtual reality projection imaging system |
WO2019079350A2 (en) | 2017-10-16 | 2019-04-25 | Digilens, Inc. | Systems and methods for multiplying the image resolution of a pixelated display |
WO2019136476A1 (en) | 2018-01-08 | 2019-07-11 | Digilens, Inc. | Waveguide architectures and related methods of manufacturing |
KR20200108030A (en) | 2018-01-08 | 2020-09-16 | 디지렌즈 인코포레이티드. | System and method for high throughput recording of holographic gratings in waveguide cells |
CN208498766U (en) * | 2018-03-28 | 2019-02-15 | 佛山正能光电有限公司 | Diving face mirror |
CN108803032B (en) * | 2018-05-29 | 2020-10-09 | 上海交通大学 | Reflective augmented reality display system and equipment |
US11402801B2 (en) | 2018-07-25 | 2022-08-02 | Digilens Inc. | Systems and methods for fabricating a multilayer optical structure |
WO2020168348A1 (en) | 2019-02-15 | 2020-08-20 | Digilens Inc. | Methods and apparatuses for providing a holographic waveguide display using integrated gratings |
KR20210134763A (en) | 2019-03-12 | 2021-11-10 | 디지렌즈 인코포레이티드. | Holographic waveguide backlights and related manufacturing methods |
TWI740123B (en) | 2019-04-02 | 2021-09-21 | 酷設工坊股份有限公司 | A helmet with an optical machine remover |
US20200386947A1 (en) | 2019-06-07 | 2020-12-10 | Digilens Inc. | Waveguides Incorporating Transmissive and Reflective Gratings and Related Methods of Manufacturing |
KR20220038452A (en) | 2019-07-29 | 2022-03-28 | 디지렌즈 인코포레이티드. | Method and apparatus for multiplying the image resolution and field of view of a pixelated display |
JP2022546413A (en) | 2019-08-29 | 2022-11-04 | ディジレンズ インコーポレイテッド | Vacuum grating and manufacturing method |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020113921A1 (en) * | 1994-06-27 | 2002-08-22 | Yingqiu Jiang | High-brightnesss color liquid crystal display panel employing light recycling therein |
Family Cites Families (59)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3697154A (en) * | 1971-05-12 | 1972-10-10 | Us Navy | Optical viewing system |
GB1418891A (en) * | 1972-01-28 | 1975-12-24 | Nat Res Dev | Headup display aparatus |
US3915548A (en) * | 1973-04-30 | 1975-10-28 | Hughes Aircraft Co | Holographic lens and liquid crystal image source for head-up display |
US3885095A (en) * | 1973-04-30 | 1975-05-20 | Hughes Aircraft Co | Combined head-up multisensor display |
US3887273A (en) * | 1973-07-27 | 1975-06-03 | Friedemann Conrad J | Speedometer optical projection system |
US3940204A (en) * | 1975-01-23 | 1976-02-24 | Hughes Aircraft Company | Optical display systems utilizing holographic lenses |
US4190832A (en) * | 1978-04-18 | 1980-02-26 | Sailor Mohler | Polarized windshield indicia reflection display system |
US4269475A (en) * | 1978-10-05 | 1981-05-26 | Elliott Brothers (London) Limited | Head-up displays |
US4407564A (en) * | 1980-01-22 | 1983-10-04 | Elliott Brothers (London) Limited | Head-up displays |
US4398799A (en) * | 1980-03-04 | 1983-08-16 | Pilkington P.E. Limited | Head-up displays |
US4432597A (en) * | 1980-12-15 | 1984-02-21 | International Business Machines Corporation | Transmissive holographic optical element on aberrating substrate |
US4582394A (en) * | 1982-06-22 | 1986-04-15 | Pilkington P.E. Limited | Display apparatus |
US4447128A (en) * | 1982-12-03 | 1984-05-08 | Hughes Aircraft Company | Diffraction head up display solar radiation filter |
FR2542459B1 (en) * | 1983-03-07 | 1987-01-30 | Thomson Csf | HIGH HEAD SIGHT |
US4613200A (en) * | 1984-07-09 | 1986-09-23 | Ford Motor Company | Heads-up display system with holographic dispersion correcting |
DE3528664A1 (en) * | 1984-08-31 | 1986-03-06 | GEC Avionics Ltd., Rochester, Kent | OPTICAL PROJECTOR FOR A PROJECTED FRONT DISPLAY |
DE3822222A1 (en) * | 1988-07-01 | 1990-01-04 | Bosch Gmbh Robert | DEVICE FOR HEAD-UP DISPLAYS ON MOTOR VEHICLES |
US4880287A (en) * | 1987-01-06 | 1989-11-14 | Hughes Aircraft Company | Complex conjugate hologram display |
US5313292A (en) * | 1987-06-12 | 1994-05-17 | Flight Dynamics | Windshield display system for an automobile |
US5278532A (en) * | 1987-09-14 | 1994-01-11 | Hughes Aircraft Company | Automotive instrument virtual image display |
IL88931A (en) | 1988-01-25 | 1992-05-25 | Kaiser Aerospace & Electronics | Multiple image-forming apparatus |
US4877307A (en) * | 1988-07-05 | 1989-10-31 | Kaiser Aerospace & Electronics Corporation | Stereoscopic display |
GB8822731D0 (en) * | 1988-09-28 | 1988-11-02 | Secr Defence | Head-up display |
US4900133A (en) * | 1988-10-27 | 1990-02-13 | Kaiser Electronics | Heads-up display combiner utilizing a cholesteric liquid crystal element |
JP2598495B2 (en) * | 1988-11-21 | 1997-04-09 | シャープ株式会社 | Driving method of liquid crystal display device |
FR2655742B1 (en) * | 1989-12-12 | 1992-01-17 | Sextant Avionique | OPTICAL DEVICE FOR THE VISUALIZATION OF LUMINOUS DATA COLLIMATED AT THE ENDLESS. |
US5343313A (en) * | 1990-03-20 | 1994-08-30 | James L. Fergason | Eye protection system with heads up display |
FR2681702A1 (en) * | 1991-09-24 | 1993-03-26 | Renault | Device for displaying information by projection |
US5940150A (en) * | 1991-11-27 | 1999-08-17 | Reveo, Inc. | Electro-optical glazing structures having total-reflection and transparent modes of operation for use in dynamical control of electromagnetic radiation |
US5691789A (en) * | 1995-10-30 | 1997-11-25 | Li; Le | Single-layer reflective super broadband circular polarizer and method of fabrication therefor |
US6473143B2 (en) * | 1991-11-27 | 2002-10-29 | Reveo, Inc. | Broadband switchable polarizer |
US5864326A (en) | 1992-02-07 | 1999-01-26 | I-O Display Systems Llc | Depixelated visual display |
US5303085A (en) * | 1992-02-07 | 1994-04-12 | Rallison Richard D | Optically corrected helmet mounted display |
US5805119A (en) * | 1992-10-13 | 1998-09-08 | General Motors Corporation | Vehicle projected display using deformable mirror device |
WO1994014098A1 (en) * | 1992-12-14 | 1994-06-23 | Nippondenso Co., Ltd. | Image display |
GB2278692B (en) * | 1993-06-04 | 1996-06-26 | Gec Ferranti Defence Syst | A helmet display system |
US5585967A (en) * | 1993-09-07 | 1996-12-17 | The Walt Disney Company | Three dimensional virtual image system |
US5534950A (en) * | 1993-10-04 | 1996-07-09 | Laser Power Corporation | High resolution image projection system and method employing lasers |
US5408346A (en) * | 1993-10-20 | 1995-04-18 | Kaiser Electro-Optics, Inc. | Optical collimating device employing cholesteric liquid crystal and a non-transmissive reflector |
US5991087A (en) * | 1993-11-12 | 1999-11-23 | I-O Display System Llc | Non-orthogonal plate in a virtual reality or heads up display |
US5859714A (en) * | 1993-11-16 | 1999-01-12 | Asahi Glass Company, Ltd. | Head-up display, a combiner used for the head-up display and a method of designing the head-up display |
JPH07159813A (en) * | 1993-12-07 | 1995-06-23 | Hitachi Ltd | Liquid crystal display device |
DE4445555C2 (en) * | 1993-12-24 | 2002-07-18 | Hyundai Autonet Co | Field of view display device for vehicles |
US5541745A (en) * | 1994-01-25 | 1996-07-30 | Fergason; James L. | Illumination system for a display using cholesteric liquid crystal reflectors |
DE4413829A1 (en) * | 1994-04-20 | 1995-10-26 | Deutsche Forsch Luft Raumfahrt | Device for generating an image |
US5638202A (en) * | 1994-06-10 | 1997-06-10 | Rofe; Michael E. | Liquid crystal windshield display |
US5903395A (en) * | 1994-08-31 | 1999-05-11 | I-O Display Systems Llc | Personal visual display system |
JPH08153189A (en) * | 1994-11-28 | 1996-06-11 | Nec Niigata Ltd | Optionally magnification varying device for digital image |
US5644323A (en) * | 1994-12-21 | 1997-07-01 | Siliscape, Inc. | Miniature synthesized virtual image electronic display |
US5991085A (en) * | 1995-04-21 | 1999-11-23 | I-O Display Systems Llc | Head-mounted personal visual display apparatus with image generator and holder |
US5767820A (en) * | 1995-05-09 | 1998-06-16 | Virtual Research Systems | Head-mounted visual display apparatus |
US5694230A (en) * | 1995-06-07 | 1997-12-02 | Digital Optics Corp. | Diffractive optical elements as combiners |
EP0811046B1 (en) * | 1995-12-21 | 2000-09-06 | Koninklijke Philips Electronics N.V. | Method of manufacturing a switchable cholesteric filter as well as a luminaire having such a filter |
US5771124A (en) * | 1996-07-02 | 1998-06-23 | Siliscape | Compact display system with two stage magnification and immersed beam splitter |
US5973727A (en) * | 1997-05-13 | 1999-10-26 | New Light Industries, Ltd. | Video image viewing device and method |
JP3716625B2 (en) * | 1997-09-18 | 2005-11-16 | コニカミノルタホールディングス株式会社 | Video observation apparatus, camera, and video observation system |
US5903396A (en) * | 1997-10-17 | 1999-05-11 | I/O Display Systems, Llc | Intensified visual display |
US6731253B1 (en) * | 1999-08-05 | 2004-05-04 | Honeywell International Inc. | Ambient adaptable optical combiner |
IL136248A (en) * | 2000-05-21 | 2004-08-31 | Elop Electrooptics Ind Ltd | System and method for varying the transmittance of light through a media |
-
2002
- 2002-04-23 TW TW091108331A patent/TWI233500B/en not_active IP Right Cessation
- 2002-04-23 WO PCT/US2002/012860 patent/WO2002086591A1/en not_active Application Discontinuation
- 2002-04-23 US US10/128,675 patent/US6844980B2/en not_active Expired - Fee Related
-
2004
- 2004-09-21 US US10/946,043 patent/US20050041297A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020113921A1 (en) * | 1994-06-27 | 2002-08-22 | Yingqiu Jiang | High-brightnesss color liquid crystal display panel employing light recycling therein |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9619201B2 (en) | 2000-06-02 | 2017-04-11 | Oakley, Inc. | Eyewear with detachable adjustable electronics module |
US9451068B2 (en) | 2001-06-21 | 2016-09-20 | Oakley, Inc. | Eyeglasses with electronic components |
US7158095B2 (en) * | 2003-07-17 | 2007-01-02 | Big Buddy Performance, Inc. | Visual display system for displaying virtual images onto a field of vision |
US20050012682A1 (en) * | 2003-07-17 | 2005-01-20 | Jenson Barton James | Visual display system for displaying virtual images onto a field of vision |
US10222617B2 (en) | 2004-12-22 | 2019-03-05 | Oakley, Inc. | Wearable electronically enabled interface system |
US10120646B2 (en) | 2005-02-11 | 2018-11-06 | Oakley, Inc. | Eyewear with detachable adjustable electronics module |
US9494807B2 (en) | 2006-12-14 | 2016-11-15 | Oakley, Inc. | Wearable high resolution audio visual interface |
US10288886B2 (en) | 2006-12-14 | 2019-05-14 | Oakley, Inc. | Wearable high resolution audio visual interface |
US9720240B2 (en) | 2006-12-14 | 2017-08-01 | Oakley, Inc. | Wearable high resolution audio visual interface |
US8876285B2 (en) | 2006-12-14 | 2014-11-04 | Oakley, Inc. | Wearable high resolution audio visual interface |
US8786519B2 (en) * | 2008-03-04 | 2014-07-22 | Elbit Systems Ltd. | Head up display utilizing an LCD and a diffuser |
US20110050548A1 (en) * | 2008-03-04 | 2011-03-03 | Elbit Systems Electro Optics Elop Ltd. | Head up display utilizing an lcd and a diffuser |
US9720231B2 (en) | 2012-09-26 | 2017-08-01 | Dolby Laboratories Licensing Corporation | Display, imaging system and controller for eyewear display device |
US9470893B2 (en) | 2012-10-11 | 2016-10-18 | Sony Computer Entertainment Europe Limited | Head mountable device |
US9720258B2 (en) | 2013-03-15 | 2017-08-01 | Oakley, Inc. | Electronic ornamentation for eyewear |
US10288908B2 (en) | 2013-06-12 | 2019-05-14 | Oakley, Inc. | Modular heads-up display system |
US9720260B2 (en) | 2013-06-12 | 2017-08-01 | Oakley, Inc. | Modular heads-up display system |
US9429757B1 (en) * | 2013-11-09 | 2016-08-30 | Jonathan Peeri | System for providing projected information combined with outside scenery |
US20180081173A1 (en) * | 2015-04-02 | 2018-03-22 | Continental Automotive Gmbh | Head-Up Display |
US10656413B2 (en) * | 2015-04-02 | 2020-05-19 | Continental Automotive Gmbh | Head-up display |
EP3380886B1 (en) * | 2015-11-25 | 2022-06-15 | Continental Automotive Systems, Inc. | Display system adjustable based on the brightness of the background |
WO2017115081A1 (en) * | 2015-12-30 | 2017-07-06 | Daqri Holographics Ltd | Near eye dynamic holography |
US11281003B2 (en) | 2015-12-30 | 2022-03-22 | Dualitas Ltd | Near eye dynamic holography |
Also Published As
Publication number | Publication date |
---|---|
US20020171940A1 (en) | 2002-11-21 |
TWI233500B (en) | 2005-06-01 |
WO2002086591A1 (en) | 2002-10-31 |
WO2002086591A9 (en) | 2002-12-05 |
US6844980B2 (en) | 2005-01-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6844980B2 (en) | Image display system and electrically actuatable image combiner therefor | |
US4900133A (en) | Heads-up display combiner utilizing a cholesteric liquid crystal element | |
US7411637B2 (en) | System and method for varying the reflectance or transmittance of light | |
US6762801B2 (en) | Varying light transmittance through a display panel | |
EP0886169B1 (en) | Reflective liquid crystal display device | |
EP0989441B1 (en) | Laminated phase plate and liquid crystal display comprising the plate | |
US20040201795A1 (en) | Liquid crystal display with internal polarizer | |
JP5264054B2 (en) | Liquid crystal display element | |
US6407787B1 (en) | Reflective liquid crystal display device | |
KR20050110614A (en) | Head-up display with polarized light source and wide-angle p-polarization reflective polarizer | |
WO2003100517A2 (en) | Real image configuration for a high efficiency heads-up display (hud) using a polarizing mirror and a polarization preserving screen | |
US6144432A (en) | Reflective liquid crystal display device | |
US20020180913A1 (en) | Reverse reflectance mode direct-view liquid crystal display employing a liquid crystal having a characteristic wavelength in the non-visible spectrum | |
EP0296710B1 (en) | Head-up display combiner utilizing a cholesteric liquid crystal element | |
EP1156359A1 (en) | Liquid crystal display unit | |
JP2007534971A (en) | Super twisted nematic liquid crystal display using crystalline thin film polarizer | |
US10670781B2 (en) | Mirror with image display function and half mirror | |
JP2001264819A (en) | Liquid crystal display device | |
US20230393440A1 (en) | Optical filter materials and devices | |
US20230028048A1 (en) | Reflection film, windshield glass, and head-up display system | |
JPH0756157A (en) | Liquid crystal display device | |
CN112339357B (en) | Composite film layer, window comprising same, display system and automobile | |
CN1768293A (en) | Liquid crystal display with internal polarizer | |
Lee et al. | Optical coatings for displays and lighting | |
JP2000347155A (en) | Optical display device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |