US20190212195A9 - Diffractive waveguide providing structured illumination for object detection - Google Patents

Diffractive waveguide providing structured illumination for object detection Download PDF

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Publication number
US20190212195A9
US20190212195A9 US15/670,875 US201715670875A US2019212195A9 US 20190212195 A9 US20190212195 A9 US 20190212195A9 US 201715670875 A US201715670875 A US 201715670875A US 2019212195 A9 US2019212195 A9 US 2019212195A9
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Prior art keywords
light
apparatus
sbg
image
element
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US15/670,875
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US10409144B2 (en
US20170356801A1 (en
Inventor
Milan Momcilo Popovich
Jonathan David Waldern
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DigiLens Inc
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DigiLens Inc
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Priority to US27260109P priority Critical
Priority to PCT/GB2010/001920 priority patent/WO2011042711A2/en
Priority to US13/506,389 priority patent/US9075184B2/en
Priority to US14/545,578 priority patent/US9726540B2/en
Application filed by DigiLens Inc filed Critical DigiLens Inc
Assigned to DIGILENS, INC. reassignment DIGILENS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: POPOVICH, MILAN MOMCILO, WALDERN, JONATHAN DAVID
Priority to US15/670,875 priority patent/US10409144B2/en
Publication of US20170356801A1 publication Critical patent/US20170356801A1/en
Publication of US20190212195A9 publication Critical patent/US20190212195A9/en
Assigned to DIGILENS INC. reassignment DIGILENS INC. CORRECTIVE ASSIGNMENT TO CORRECT THE ASSIGNEE NAME PREVIOUSLY RECORDED ON REEL 043221 FRAME 0702. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Assignors: POPOVICH, MILAN MOMCILO, WALDERN, JONATHAN DAVID
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    • G02F1/31Digital deflection, i.e. optical switching
    • G02F1/315Digital deflection, i.e. optical switching based on the use of controlled internal reflection
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    • G03FPHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L33/00Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/02Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
    • H01L33/10Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a light reflecting structure, e.g. semiconductor Bragg reflector
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Abstract

A projection display device comprising a light source and an SBG device having a multiplicity of separate SBG elements sandwiched between transparent substrates to which transparent electrodes have been applied. The substrates function as a light guide. A least one transparent electrode comprises a plurality of independently switchable transparent electrode elements, each electrode element substantially overlaying a unique SBG element. Each SBG element encodes image information to be projected on an image surface. Light coupled into the light guide undergoes total internal reflection until diffracted out to the light guide by an activated SBG element. The SBG diffracts light out of the light guide to form an image region on an image surface when subjected to an applied voltage via said transparent electrodes.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • This application is a continuation of U.S. application Ser. No. 14/545,578 filed May 26, 2015, now U.S. Pat. No. 9,726,540, which is a Continuation of U.S. application Ser. No. 13/506,389 filed Apr. 17, 2012, now U.S. Pat. No. 9,075,184, which is a National Phase of PCT/GB10/001920 filed Oct. 7, 2010, which claims the priority of U.S. Provisional Patent Application No. 61/272,601 with a filing date of 9 Oct. 2009 entitled “Compact edge illuminated diffractive display”, the disclosures of which are hereby incorporated in their entirety by reference herein.
  • REFERENCE TO EARLIER APPLICATIONS
  • This application incorporates by reference in their entireties PCT Application No. PCT/US2004/014124 by Popovich et al, entitled “Switchable Viewfinder Display”; PCT Application No PCT/IB2008/001909 by Popovich et al, entitled “Laser Illumination Device” ; PCT Application No PCT US2006/043938 by Popovich et al, entitled “Method and Apparatus for Switching a PDLC device” and United States Provisional Patent Application No. 61/272,601 with filing date 9 Oct. 2009 entitled “Compact edge illuminated diffractive display”.
  • BACKGROUND
  • This invention relates to a display device, and more particularly to a compact edge-iluminated projection display based on switchable Bragg gratings.
  • There is growing consumer demand for projection displays that can be built into mobile devices such as mobile telephones and hand-held computers. However, image sizes and resolutions required for typical applications such as internet browsing or viewing high definition films are already beyond the scope of display technologies currently available for use in mobile devices. New ultra compact projectors known as picoprojectors provide one solution to this problem. Many of the picoprojector designs considered to date rely on conventional flat panel display technologies such as Liquid Crystal Display (LCD) or Digital Light Processor (DLP) technology such as that developed by Texas Instruments (TX). Optical design limits the miniaturization possible with either approach, even when solid state lasers are used as the light source. An alternative approach is to scan the image using micro-optical-electrical-mechanical systems (MOEMS), essentially writing the image using a flying spot. Although MOEMS are much smaller than LCDs or DLPs they present complex opto-mechanical design problems. Very high scanning speeds, resolutions and the tight synchronization of mirror driver and laser modulation are needed in order to deliver high resolution images. Achieving the mechanical robustness required in portable applications is also a challenge. A further problem is that it is also difficult to correct laser speckle in scanned displays.
  • Desirably, display technologies for portable devices should be very compact with volumes of a few cubic centimeters. A thin form-factor is desirable for ease of integration into devices such as mobile telephones.
  • There is a requirement for a compact solid-state high-resolution data projection display with a thin form factor.
  • SUMMARY
  • It is an object of the present invention to provide compact solid-state high-resolution data projection display with a thin form factor.
  • A projection display device according to the principles of the invention comprises: a first light source emitting light of a first wavelength; a first SBG device comprising a multiplicity of separately switchable SBG elements disposed in a single layer; transparent substrates sandwiching the SBG device, said substrates together functioning as a first light guide; and a means for coupling the first wavelength light into the first light guide. The first wavelength light undergoes total internal reflection within the first light guide. Transparent electrodes are applied to opposing faces of the substrates. At least one of the transparent electrodes comprises a plurality of independently switchable transparent electrode elements. Each electrode element overlays a unique SBG element. Each SBG element in first SBG device diffracts first wavelength light to form an image region on an image surface when subjected to an applied voltage via the transparent electrodes.
  • In one embodiment of the invention the image surface is disposed in proximity to the display.
  • In one embodiment of the invention the image surface is disposed more than 25 centimeters from said display.
  • In one embodiment of the invention the image surface is disposed more than 50 centimeters from said display.
  • In one embodiment of the invention one image region comprises an image of a keyboard.
  • In one embodiment of the invention the image region is an image pixel.
  • In one embodiment of the invention an SBG element pre-distorts the shape of the image region.
  • In one embodiment of the invention the image surface is an optical diffusing material.
  • In one embodiment of the invention the image surface is the retina of an eye.
  • In one embodiment of the invention the image surface is a curved surface.
  • In one embodiment of the invention the display further comprises: at least one infrared source; means for directing infrared light from the infrared source towards the image surface and at least one infrared sensor operative to detect light scatter from an object disposed in proximity to the image surface. The infrared source may be a laser. The infrared sensor may comprise an image sensing array and lens.
  • In one embodiment of the invention the display further comprises: at least one infrared source; means for directing infrared light from the infrared source towards the image surface and at least one infrared sensor operative to detect light scatter from an object disposed in proximity to the image surface. The first SBG device contains at least one infrared diffracting SBG element operative to diffract infrared light from the infrared source towards the image surface when the infrared diffracting SBG element is subjected to an applied voltage via the transparent electrodes.
  • In one embodiment of the invention that provides full-colour imaging the display further comprises: second and third light sources emitting light of second and third wavelengths; second and third SBG devices each comprising a multiplicity of separately switchable SBG elements disposed in a single layer, the SBG elements of the first second and third SBG devices substantially overlapping each other; transparent substrates sandwiching the second SBG device, said substrates together functioning as a second light guide; transparent substrates sandwiching the third SBG device, said substrates together functioning as a third light guide; and means for coupling the first, second and third wavelength light into the first, second and third light guide. Transparent electrodes are applied to substrate faces in contact with the second and third SBG devices. At least one of the transparent electrodes in contact with the second and third SBG devices comprises a plurality of independently switchable transparent electrodes elements, each of the independently switchable electrodes substantially overlays a unique SBG element. The first, second and third wavelength light undergoes total internal reflection within the light guides, Each element of the second SBG device diffracts second wavelength light to form a second image region on an image surface when subjected to an applied voltage via the transparent electrodes. Each element of the third SBG device diffracts third wavelength light to form a third image region on an image surface when subjected to an applied voltage via the transparent electrodes. The first, second and third image regions substantially overlap.
  • In one embodiment of the invention that provides full colour imaging SBG elements in the first, second and third wavelength SBG devices are activated in bands. Each band comprises at least one row of SBG elements. Each band is continuously scrolled vertically. At least one band in each of the first, second and third SBG devices is activated at any instant with no overlap occurring between the first, second and third wavelength SBG device bands.
  • A more complete understanding of the invention can be obtained by considering the following detailed description in conjunction with the accompanying drawings wherein like index numerals indicate like parts. For purposes of clarity details relating to technical material that is known in the technical fields related to the invention have not been described in detail.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a schematic side elevation view of one embodiment of the invention.
  • FIG. 2 is a schematic front elevation view of a detail of an SBG device in one embodiment of the invention.
  • FIG. 3 is a schematic side elevation view of one embodiment of the invention.
  • FIG. 4 is a schematic side elevation view of one embodiment of the invention.
  • FIG. 5 is a schematic plan view of the embodiment of the invention illustrated in FIG. 4.
  • FIG. 6 is a schematic side elevation view of one embodiment of the invention.
  • FIG. 7 is a schematic front elevation view of a scrolling SBG device in one embodiment of the invention.
  • FIG. 8 is a front elevation view of structured illumination provided by one embodiment of the invention.
  • FIG. 9 is a front elevation view of structured illumination provided by one embodiment of the invention.
  • FIG. 10 is a schematic side elevation view of one embodiment of the invention incorporating an infrared source and infrared detector.
  • FIG. 11 is a schematic plan view of one embodiment of the invention incorporating an infrared source and an infrared detector.
  • FIG. 12 is a schematic side elevation view of one embodiment of the invention incorporating an infrared source and an infrared detector.
  • FIG. 13 is a schematic plan view of an embodiment of the invention that provides a virtual keyboard.
  • FIG. 14 is a schematic side elevation vies of an embodiment of the invention that uses reflective SBGs.
  • DETAILED DESCRIPTION
  • It will apparent to those skilled in the art that the present invention may be practiced with some or all of the present invention as disclosed in the following description. For the purposes of explaining the invention well-known features of optical technology known to those skilled in the art of optical design and visual displays have been omitted or simplified in order not to obscure the basic principles of the invention.
  • Unless otherwise stated the term “on-axis” in relation to a ray or a beam direction refers to propagation parallel to an axis normal to the surfaces of the optical components used in the embodiments of the invention. In the following description the terms light, ray, beam and direction may be used interchangeably and in association with each other to indicate the direction of propagation of light energy along rectilinear trajectories.
  • Parts of the following description will be presented using terminology commonly employed by those skilled in the art of optical design.
  • It should also be noted that in the following description of the invention repeated usage of the phrase “in one embodiment” does not necessarily refer to the same embodiment.
  • The compact projection display disclosed in the present application is based on a diffractive optical device known as a Switchable Bragg Grating (SBG). A SBG is a Bragg grating recorded into a polymer dispersed liquid crystal (PDLC) mixture. Typically, SBG devices are fabricated by first placing a thin film of a mixture of photopolymerizable monomers and liquid crystal material between parallel glass plates. One or both glass plates support electrodes, typically transparent indium tin oxide films, for applying an electric field across the PDLC layer. A Bragg grating is then recorded by illuminating the liquid material with two mutually coherent laser beams, which interfere to form the desired grating structure. During the recording process, the monomers polymerize and the PDLC mixture undergoes a phase separation, creating regions densely populated by liquid crystal micro-droplets, interspersed with regions of clear polymer. The alternating liquid crystal-rich and liquid crystal-depleted regions form the fringe planes of the grating. The resulting Bragg grating can exhibit very high diffraction efficiency, which may be controlled by the magnitude of the electric field applied across the PDLC layer. In the absence of an applied electric field the SBG remains in its diffracting state. When an electric field is applied to the hologram via the electrodes, the natural orientation of the LC droplets is changed thus reducing the refractive index modulation of the fringes and causing the hologram diffraction efficiency to drop to very low levels. The diffraction efficiency of the device can be adjusted, by means of the applied voltage, over a continuous range from essentially zero to near 100%. U.S. Pat. No. 5,942,157 by Sutherland et al. and U.S. Pat. No. 5,751,452 by Tanaka et al. describe monomer and liquid crystal material combinations suitable for fabricating ESBG devices.
  • In one embodiment of the invention illustrated in the schematic side elevation view of FIG. 1 there is provided an SBG array device comprising a pair of transparent substrates 11 and 12 and an SBG layer 20 sandwiched between the substrates. The two substrates 11 and 12 together form a light guide. The SBG layer comprises an array of individually switchable SBG elements. As will be discussed below the SBG elements may be switched using a range of spatio-temporal switching schemes, including any of the active matrix switching regimes used in conventional flat panel displays. Typically the substrates will be fabricated from optical glass such as BK7 or a high quality optical plastic.
  • Transparent electrodes, which are not shown in FIG. 1, are applied to both of the inner surfaces of the substrates and electrically coupled to a voltage generator (not illustrated). The electrodes are configured such that the applied electric field will be perpendicular to the substrates. Typically, the planar electrode configuration requires low voltages, in the range of 2 to 4 volts per μm. The electrodes would typically be fabricated from Indium Tin Oxide (ITO). Commercially available ITO typically has a coating resistance of typically 300-500 Ohm/sq. An exemplary ITO film used by the inventors is the N00X0325 film manufactured by Applied Films Corporation (Colorado). Typically, ITO films used with the present invention have a thickness of 100 Angstrom.
  • In one embodiment of the invention the electrode on one substrate surface is uniform and continuous, while the electrode on the opposing substrate surface is patterned to match the shapes of the SBG elements. In an alternative embodiment of the invention the electrodes may be identically patterned such that each SBG element is sandwiched by identical electrodes matching the shape of the SBG element. Desirably, the planar electrodes should be exactly aligned with the SBG elements for optimal switching of the symbols and the elimination of any image artefacts that may result from unswitched grating regions.
  • In practice the SBG elements will separated by very narrow grating-free regions which are essentially homogenous regions of PDLC that generally do not respond to applied electric fields. Such grating-free regions normally result from masking during fabrication of the SBG device.
  • Techniques for overcoming problems associated with such gaps are disclosed in PCT Application No PCT/US2006/043938 by Popovich et al, entitled “Method and Apparatus for Switching a PDLC device”, which is incorporated by reference herein in its entirety, may be used with the present invention. In most applications of the invention the effects on image quality of such gaps between SBG elements are not likely to be significant.
  • An SBG contains slanted fringes resulting from alternating liquid crystal rich regions and polymer rich (i.e. liquid crystal depleted) regions. SBGs may be configured to be transmissive or reflective according to the slant of the fringes. Reflection SBGs are characterized by fringes that are substantially parallel to the substrates. For the purposes of explaining the invention transmissive SBGs will be assumed in the following description. However, it should be clear that any of the embodiments of the invention may be practiced using either reflective or transmissive SBGs. With no electric field applied, the extraordinary axis of the liquid crystals generally aligns normal to the fringes. The grating thus exhibits high refractive index modulation and high diffraction efficiency for P-polarized light. When an electric field is applied to the SBG, the extraordinary axes of the liquid crystal molecules align parallel to the applied field and hence perpendicular to the substrate. Note that the electric field due to the planar electrodes is perpendicular to the substrate. In this state the grating exhibits lower refractive index modulation and lower diffraction efficiency for both S- and P-polarized light. Thus the grating region no longer diffracts light but rather acts like a transparent plate have little effect on incident light other than a small amount of absorption, scatter and Fresnel reflection loss at the grating-substrate interfaces.
  • The operation of a compact projection display according to the principles of the invention may be understood with reference to FIGS. 1-3. FIG. 2 shows a front elevation view of the SBG array. FIG. 3 shows a side elevation view of the display. We consider the case in which one SBG element 22 is in its active or diffracting state and all other SBG elements such as the one indicated by 21 are in their passive or non diffracting states. Input light 1000 from a source 4 is optically coupled to the substrates 11 and 12 via an optical coupling device 3. Light admitted into the light guide undergoes TIR between the outer surfaces of the substrates 11,12.
  • Advantageously, the source is a solid state laser. Alternatively, the source may be a Light Emitting Diode (LED). However the broader spectral bandwidth of LEDs will result in some chromatic dispersion at the SBG elements. The coupling device may be a prism or a grating. The invention does not assume any particular method for coupling light into the substrates.
  • However, a method based on a grating is highly desirable from the perspective of minimizing the thickness of the display. To overcome laser speckle the display would advantageously also incorporate a despeckler such as the one disclosed in the PCT application PCT/IB2008/0019099 with International Filing date 22 Jul. 2008 entitled “LASER ILLUMINATION DEVICES” which is incorporated by reference herein in its entirety. The invention may be applied with any other type of despeckler but preferably one based on solid state technology.
  • The input light 1000 is deflected into the ray direction 1001 by the coupling device 3. The deflection angle in the substrates should exceed the critical angle for the substrate medium to air interface. The ray now follows a TIR path constrained by the outer surfaces of the light guide provided by the substrates. Hence, the ray 1001 is totally internally reflected into the ray path indicated by 1001,1002,1003.
  • The grating in each SBG element encodes wave-front amplitude and phase modulation information such that that incident TIR light is diffracted to form a focused image region of predefined geometry and luminance distribution at the image surface 5. The light 1003 which impinges on the active SBG element 22 is diffracted towards the image surface 5 as the beam 1004. As indicated in FIG. 3, the diffracted light 1004 forms an image 1100 at the image surface 5. Light which does not impinge on the SBG element will hit the substrate-air interface at the critical angle and is therefore totally internally reflected and eventually collected at a beam stop, which is not illustrated. The invention does not assume any particular method for trapping non diffracted light.
  • The image surface 5 may a diffusing surface of any geometry and as indicated in FIG. 3 may be tilted with respect to the display. In typical applications of the invention the image surface will be a plane. The image surface will most typically will be either parallel to or orthogonal to the grating plane. The image is formed without the need for an additional lens or any other optical element between the SBG array and the surface. Another important feature of the invention is that, since the SBG array elements each contain diffraction patterns, the resolution of the final projected images is much higher than the resolution of the array. The side elevation view of the display of FIG. 1 in which the source and coupling optics are omitted shows the formation of an image element 1100 on the surface 5 by the SBG element 22.
  • In one embodiment of the invention the image element may be a rectangular pixel having a luminance level determined by the voltage applied across the SBG element. By applying voltages to each SBG in the SBG array a pixelated image is provided over a predefined image area. An SBG element may be designed to provide pre-distortion of the image element geometry to compensate for the effects of off axis projection, such as key-stoning. The invention is not necessarily limited to pixelated display applications. In one embodiment of the invention the image element formed by a SBG element may have an intensity distribution within a predefined area. As will be explained below such an embodiment may be used to provide structured illumination for a range of applications.
  • The techniques for encoding such optical functions into an SBG are well known to those skilled in the design of Holographic Optical Elements (HOEs) and Diffractive Optical Elements (DOEs). The invention does not rely on any particular method of encoding optical functions into SBGs. Advantageously the SBG element is fabricated by first designing and fabricating a Computer Generated Hologram (CGH) with the required optical properties and then recording the CGH into the ESBG element. The above process is equivalent to forming a hologram of the CGH. The invention does not rely on any particular method for recording the CGH into the SBG.
  • Any holographic recording techniques known to those skilled in the art of holography may be used. It should be noted that the resulting SBG element is not identical in every respect to the CGH since properties of a CGH rely on its surface phase relief features while the optical characteristics of a Bragg grating such as an SBG rely on a complex three dimensional fringe distribution. The basic principles of computer generated holograms suitable for use in the present invention are discussed in an article entitled HASMAN E et al “Diffractive Optics: Design Realisation and Applications”, Fibre and Integrated Optics; 16:1-25, 1997.
  • It should be clear from consideration of FIGS. 1-3 that a display according to the principles of the invention will be transparent to external ambient light such as the light 1005 indicated in FIG. 1. Since the external light is broadband and incident over a wide range of angles only a small portion of it will be lost due to diffraction at active SBG elements. In other words only a very small portion of the external light will have incidence angles and wavelengths that satisfy the Bragg condition at the active SBG elements. The ex al light will also suffer small transmission loss due to Fresnel reflections, scatter and absorption.
  • Typically, the image surface is disposed between 25-100 centimetres from the display. However, the distances may be much greater depending on the application and the image brightness requirements. In certain embodiments of the invention the image surface may be very close to the display. In such embodiments the image and image surface may be integrated within a directly viewable display module. However, such embodiments will sacrifice the image magnifications obtained by projecting the image over a longer distance.
  • In one embodiment of the invention based on the embodiment illustrated in FIGS. 1-3 there is provided a colour projection display. The basic principles of the colour display are illustrated in FIGS. 4-5. Light from separate red green and blue sources is coupled into the light-guide formed by the substrates 11,12. Again the coupling optics, which are not illustrated, may comprise prisms or diffractive elements. Many alternative methods of coupling light from different colour sources into a light guide will be known to those skilled in the art. Desirably, the coupling optics are based on diffractive optical techniques to keep the display as thin as possible. The TIR angle for each colour is constrained such that the incidence angle for a particular colour light at a given SBG satisfy the Bragg condition for diffraction at a specified diffraction angle.
  • The red, green, blue light is presented sequentially. As indicated in the schematic side elevation view of FIG. 4, incident red, green, blue TIR rays 1003R, 1003G, 1003B at the SBG 22 are diffracted into the red, green, blue image light indicated by 1004R, 1004G, 1004B towards the image surface 5 forming the colour image element 1100. FIG. 5 shows a plan view of the display showing the a plan view of the diffracted beams indicated by 1005R, 1005G, 1005B. The lateral extent of the projected beam is indicated by the rays 1006A, 1006B. Note that in FIGS. 4-5 the separation of the beams has been exaggerated for the purposes of explanation.
  • Colour imaging may also be provided by stacking red, green, and blue SBG arrays of the type illustrated in FIGS. 1-3 and providing illumination from red, green and blue light sources.
  • Such embodiments of the invention will suffer from the problems of alignment and light transmission loss. In the embodiment of the invention illustrated in the schematic side elevation view of FIG. 6 there are provided red, green and blue diffracting SBG arrays 20,30,40. The SBG arrays are sandwiched between substrates 11,12,13,14,15,16. The substrates are stacked to form a single light guiding structure. Light from separate red, green and blue sources is coupled into the light-guide. Again the preferred coupling optics are based on diffractive optical techniques to keep the display as thin as possible. Since a separate SBG arrays is provided for each colour, the TIR angle may be the same for each colour. The red, green, blue light is presented simultaneously. Referring to FIG. 6 incident red, green and blue light 1006R, 1006G, 1006B at the active red, green, blue SBG elements 22,32,42 is diffracted into the beams 1007R, 1007G, 1007B forming a colour image element 1102 at the image surface 5. Note that the separation of the beams has again been exaggerated for the purposes of explanation.
  • In one embodiment of the invention the SBG elements may be switched using a switching scheme commonly referred to as “scrolling”. Conventional colour displays rely on providing a single display panel that is updated with red, green and blue picture information in turn and sequentially fully illuminated by red, green and blue illumination. Alternatively, three panel architectures provide separate red, green and blue image panels which are separately fully illuminated by red, green and blue light. Such displays suffer from the problems of having to update the entire red, green or blue images before illumination of the appropriate colour can be applied. In the case of three-panel displays the cost of the display may become prohibitive. A single panel scrolling color projection display system is characterized by a single light modulator panel having a raster of individual picture elements or pixels, which panel is illuminated by horizontally elongated red, green and blue illumination bars or stripes. The stripes are continuously scrolled vertically across the panel while the rows of pixels are synchronously addressed with display information corresponding to the color of the then incident stripe. The modulated scrolling red, green and blue stripes are then projected onto a display screen to produce a visually integrated full color display. Exemplary scrolling displays are disclosed in U.S. Pat. No. 5,410,370, entitled “Single panel color projection video display improved scanning” issued to P. Janssen on Mar. 25, 1994, and U.S. Pat. No. 5,416,514, entitled “Single panel color projection video display having control circuitry for synchronizing the color illumination system with reading/writing of the light valve” issued to P. Janssen et al. on May 16, 1995.
  • The principles of scrolling may be applied in the present invention by switching rows of SBG elements in sequence. A basic scrolling scheme for use with the present invention is illustrated in FIG. 7. The scrolling scheme may be implemented using the embodiment of FIG. 6. In each SBG device SBG elements are activated in bands comprising at least one row of SBG elements. The bands are continuously scrolled vertically, at least one band in each of the red green and blue SBG devices being activated at any instant, said bands in said first, second and third SBG devices not overlapping. FIG. 7 shows red, green and blue states indicated by symbols R,G,B at one instant in time. In each case, the diffracting rows or bands of SBG elements are shaded. Thus red SBG band 50R, green SBG band 50G and blue SBG band 50B are diffracting while red SBG pixel rows 51R, green SBG pixel rows 51G and blue SBG pixel rows 51B are not diffracting permitting TIR to proceed.
  • In a particular group of embodiments of the invention at least one SBG array element in any of the above described embodiments may provide structured infrared illumination using light from an infra red source. The infrared light would be injected into the light guide formed by the substrates in a similar fashion to the means used to introduce visible light in any of the above embodiments. The infrared source is typically a 780 nm laser. However other near-infrared sources may be used. The structure lighting may comprise parallel bars, concentric circles and other geometrical structures commonly used in the visualization and measurement of three-dimensional shapes. Examples of structures infrared lighting are provided in FIGS. 8-9. In the example shown in FIG. 8 the structured lighting 1010 comprises parallel bars and spaces 1011,1012. In the example shown in FIG. 9 the structure lighting 1020 comprises concentric circles 1021 separated by gaps 1022.
  • FIGS. 10-11 show an embodiment similar to the one of FIGS. 4-5 in which there is further provided at least one infrared sensor such as 7 and at least one infrared source such as 8. Advantageously, the sensor is a two dimensional infrared array. The infrared source illuminates the image surface 5 with the infrared beam indicated by 1100. The infrared sensor detects backscattered light from objects within a field of view indicated by 1200. The sensor is coupled to a processor which is in turn coupled to an image processor which is not illustrated. The optical system is illustrated in plan view in FIG. 11. Since the display is transparent one or both of the infrared sensor or source may be displayed on the opposite site of the display to the image surface as indicated in FIGS. 10-11. Alternatively, one or both of the infrared sensor or source may be disposed around the periphery of the display. In one embodiment of the invention a structured light pattern based on the ones illustrated in FIGS. 8-9 may be encoded within the SBG element. Alternatively, other structured lighting patterns may be used.
  • In one embodiment of the invention illustrated in the schematic side elevation view of FIG. 12 the infrared source may be coupled via the light guide to one or more dedicated SBG arrays elements contained in the SBG array. Totally internally reflected infrared light infrared light 1009 incident on an active infrared diffracted diffracting SBG element 23 is diffracted to provide the divergent infrared light beam 1101. In one embodiment of the invention a structured light pattern based one the ones illustrated in FIGS. 8-9 may be encoded within the SBG element. Alternatively, other structured lighting patterns may be used. In one embodiment of the invention more than one infrared diffracting SBG similar to the element 23 may be provided for the purpose of determining object range by triangulation. Such an implementation of the invention may be used to provide the instantaneous location of an object near the image surface. The invention does not rely on particular method for determining range from triangulation or determined the shape of an object using structured light. Tracking algorithms which are designed to determine the range or shape of an object by analyzing changes in sequential image frames recorded by a single sensor may also be used with the invention.
  • It will be clear from consideration of the above description that the invention may be used to provide more than one viewable image. In one embodiment of the invention based on the embodiments of FIGS. 10-12 there is provided a virtual computer keyboard projected by a single SBG element. The other SBG elements are used to project a live image, in other words an image that is updated on a frame-by-frame basis. One key with symbol A is indicated by 1102.
  • The infrared sensor 7 detects infrared light 1300 scattered from a finger 81 of the hand 8. An image processing system (not illustrated) determines whether the proximity of the finger to the key is sufficiently close for a key strike to have occurred. In other embodiments of the invention more than one SBG element may be used to project elements of the keyboard onto the image surface
  • The SGB arrays in any of the above described embodiments of the invention may use SBG elements configured as wither transmissive or reflective gratings. In the embodiment illustrated in the schematic side elevation view of FIG. 14 the SBG device 60 is based on reflection gratings.
  • TIR light indicated by 1040 is reflected by the active SBG element 24 of the SBG device into the beam 1041 towards the image surface 51 forming the image 1103.
  • The SGB arrays in any of the above described embodiments of the invention may incorporate SBG elements designed to diffract thermal infra red radiation.
  • The SGB arrays in any of the above described embodiments of the invention may incorporate SBG elements designed to diffract ultraviolet radiation.
  • In one embodiment of the invention the image surface is the retina of the human eye.
  • Although the invention has been described in relation to what are presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed arrangements but rather is intended to cover various modifications and equivalent constructions included within the spirit and scope of the invention.

Claims (20)

What is claimed is:
1. Apparatus for projecting an image onto a surface comprising:
a first light source emitting light of a first wavelength;
first and second multiplicities of separately switchable grating elements;
transparent substrates sandwiching said grating elements providing a first light guide; and
a means for coupling said first wavelength light into a total internal reflection path in said first light guide,
each said grating element having a diffracting state and a non-diffracting state, wherein each element of said first multiplicity of grating elements when in its diffracting state diffracts said first wavelength light to form a focused first image region of predefined geometry and luminance distribution on said image surface,
wherein each element of said first multiplicity of grating elements encodes wavefront and phase information corresponding to said geometry and luminance distribution,
wherein each said element of said second multiplicity of grating elements provides a first unique speckle state under a first applied voltage and a second unique speckle state under a second applied voltage.
2. The apparatus of claim 1, further comprising transparent electrodes applied to said substrates, at least one of said transparent electrodes comprising a plurality of independently switchable transparent electrode elements each overlaying a unique grating element, wherein said diffracting state exists when no voltage is applied across said grating element via said transparent electrodes and said non diffracting state exists when a voltage is applied across said grating element via said transparent electrodes.
3. The apparatus of claim 1, wherein said switchable grating elements are Switchable Bragg Gratings.
4. The apparatus of claim 1, further comprising second and third light sources emitting light of second and third wavelengths and means for coupling said second and third wavelength light into total internal reflection paths in said first lightguide, wherein said first multiplicity of grating elements comprises a multiplicity of grating elements for diffracting said first wavelength light and a multiplicity of grating elements for diffracting said second wavelength light, wherein said second and third wavelength light is diffracted into second and third focused image regions of predefined geometry and luminance distribution on said image surface.
5. The apparatus of claim 4, wherein said first, second and third image regions substantially overlap.
6. The apparatus of claim 4, wherein each of said first, second and third wavelength multiplicities of grating elements are configured in rows and columns of a rectangular array, wherein grating elements in each of said rectangular arrays are switched sequentially into their diffracting states in bands comprising at least one row of grating elements, wherein no overlap exists between first, second and third wavelength grating element bands switched into their diffracting states.
7. The apparatus of claim 1, wherein said switchable grating elements are disposed in a single layer.
8. The apparatus of claim 1, wherein said first multiplicity of switchable grating elements is disposed in a first layer and said second multiplicity of switchable grating elements is disposed in a second layer.
9. The apparatus of claim 1, wherein the image surface is disposed in proximity to said display.
10. The apparatus of claim 1, wherein the image surface is more than 50 centimeters from said display.
11. The apparatus of claim 1, wherein one said image region comprises an image of a keyboard.
12. The apparatus of claim 1, wherein said image region is an image pixel.
13. The apparatus of claim 1, wherein said grating elements pre-distort the shape of said image region.
14. The apparatus of claim 1, wherein said image surface is a diffusing material.
15. The apparatus of claim 1, wherein said image surface is the retina of an eye.
16. The apparatus of claim 1, wherein said image surface is curved.
17. The apparatus of claim 1, further comprising: at least one infrared source; means for directing infrared light from said source towards said image surface and at least one infrared sensor operative to detect light scattered from an object disposed in proximity to said image surface.
18. The apparatus of claim 17, wherein said infrared source is a laser.
19. The apparatus of claim 17, wherein said infrared sensor comprises an image sensing array and lens.
20. The apparatus of claim 1, wherein said first multiplicity of grating elements contains at least one infrared diffracting grating element operative to diffract infrared light from said infrared source towards said image surface when said infrared diffracting grating element is in its diffracting state.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10642058B2 (en) 2011-08-24 2020-05-05 Digilens Inc. Wearable data display
US10670876B2 (en) 2011-08-24 2020-06-02 Digilens Inc. Waveguide laser illuminator incorporating a despeckler

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0522968D0 (en) 2005-11-11 2005-12-21 Popovich Milan M Holographic illumination device
GB0718706D0 (en) 2007-09-25 2007-11-07 Creative Physics Ltd Method and apparatus for reducing laser speckle
WO2011042711A2 (en) 2009-10-09 2011-04-14 Milan Momcilo Popovich Compact edge illuminated diffractive display
US9274349B2 (en) 2011-04-07 2016-03-01 Digilens Inc. Laser despeckler based on angular diversity
US20150010265A1 (en) 2012-01-06 2015-01-08 Milan, Momcilo POPOVICH Contact image sensor using switchable bragg gratings
WO2013167864A1 (en) 2012-05-11 2013-11-14 Milan Momcilo Popovich Apparatus for eye tracking
WO2013190257A1 (en) * 2012-06-18 2013-12-27 Milan Momcilo Popovich Apparatus for copying a hologram
US10209517B2 (en) 2013-05-20 2019-02-19 Digilens, Inc. Holographic waveguide eye tracker
WO2015015138A1 (en) 2013-07-31 2015-02-05 Milan Momcilo Popovich Method and apparatus for contact image sensing
US9335604B2 (en) 2013-12-11 2016-05-10 Milan Momcilo Popovich Holographic waveguide display
WO2016020632A1 (en) 2014-08-08 2016-02-11 Milan Momcilo Popovich Method for holographic mastering and replication
WO2016042283A1 (en) 2014-09-19 2016-03-24 Milan Momcilo Popovich Method and apparatus for generating input images for holographic waveguide displays
EP3198192A1 (en) 2014-09-26 2017-08-02 Milan Momcilo Popovich Holographic waveguide opticaltracker
WO2016113534A1 (en) 2015-01-12 2016-07-21 Milan Momcilo Popovich Environmentally isolated waveguide display
WO2016116733A1 (en) 2015-01-20 2016-07-28 Milan Momcilo Popovich Holographic waveguide lidar
US9632226B2 (en) 2015-02-12 2017-04-25 Digilens Inc. Waveguide grating device
WO2016146963A1 (en) 2015-03-16 2016-09-22 Popovich, Milan, Momcilo Waveguide device incorporating a light pipe
US10591756B2 (en) 2015-03-31 2020-03-17 Digilens Inc. Method and apparatus for contact image sensing
US10690916B2 (en) 2015-10-05 2020-06-23 Digilens Inc. Apparatus for providing waveguide displays with two-dimensional pupil expansion
CN109154717A (en) * 2016-04-11 2019-01-04 迪吉伦斯公司 Holographic waveguide device for project structured light
NZ743841A (en) 2016-07-15 2018-12-21 Light Field Lab Inc Energy propagation and transverse anderson localization with two-dimensional, light field and holographic relays
US10241244B2 (en) 2016-07-29 2019-03-26 Lumentum Operations Llc Thin film total internal reflection diffraction grating for single polarization or dual polarization
WO2018129398A1 (en) 2017-01-05 2018-07-12 Digilens, Inc. Wearable heads up displays
WO2019178614A1 (en) 2018-03-16 2019-09-19 Digilens Inc. Holographic waveguides incorporating birefringence control and methods for their fabrication
CN109141293B (en) * 2018-08-08 2020-04-24 深圳市银星智能科技股份有限公司 Object measuring method based on structured light and electronic equipment

Family Cites Families (251)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4035068A (en) 1975-06-25 1977-07-12 Xerox Corporation Speckle minimization in projection displays by reducing spatial coherence of the image light
JPS6232425A (en) 1985-08-05 1987-02-12 Brother Ind Ltd Optical deflector
US5148302A (en) 1986-04-10 1992-09-15 Akihiko Nagano Optical modulation element having two-dimensional phase type diffraction grating
US5119454A (en) 1988-05-23 1992-06-02 Polaroid Corporation Bulk optic wavelength division multiplexer
US5150234A (en) 1988-08-08 1992-09-22 Olympus Optical Co., Ltd. Imaging apparatus having electrooptic devices comprising a variable focal length lens
US4964701A (en) 1988-10-04 1990-10-23 Raytheon Company Deflector for an optical beam
US5009483A (en) 1989-04-12 1991-04-23 Rockwell Iii Marshall A Optical waveguide display system
US5099343A (en) 1989-05-25 1992-03-24 Hughes Aircraft Company Edge-illuminated liquid crystal display devices
US5410370A (en) 1990-12-27 1995-04-25 North American Philips Corporation Single panel color projection video display improved scanning
US5416514A (en) 1990-12-27 1995-05-16 North American Philips Corporation Single panel color projection video display having control circuitry for synchronizing the color illumination system with reading/writing of the light valve
US5224198A (en) 1991-09-30 1993-06-29 Motorola, Inc. Waveguide virtual image display
US5264950A (en) 1992-01-06 1993-11-23 Kent State University Light modulating device with polarizer and liquid crystal interspersed as spherical or randomly distorted droplets in isotropic polymer
US5295208A (en) 1992-02-26 1994-03-15 The University Of Alabama In Huntsville Multimode waveguide holograms capable of using non-coherent light
US5296967A (en) 1992-03-02 1994-03-22 U.S. Precision Lens Incorporated High speed wide angle projection TV lens system
US5251048A (en) 1992-05-18 1993-10-05 Kent State University Method and apparatus for electronic switching of a reflective color display
US5313330A (en) 1992-08-31 1994-05-17 U.S. Precision Lens Incorporated Zoom projection lens systems
US5371817A (en) 1993-02-16 1994-12-06 Eastman Kodak Company Multichannel optical waveguide page scanner with individually addressable electro-optic modulators
US5751452A (en) 1993-02-22 1998-05-12 Nippon Telegraph And Telephone Corporation Optical devices with high polymer material and method of forming the same
EP0746783B1 (en) 1993-02-26 2003-04-16 YEDA RESEARCH & DEVELOPMENT COMPANY, LTD. Holographic optical devices
US5371626A (en) 1993-03-09 1994-12-06 Benopcon, Inc. Wide angle binocular system with variable power capability
US5309283A (en) 1993-03-30 1994-05-03 U.S. Precision Lens Incorporated Hybrid, color-corrected, projection TV lens system
US5986746A (en) 1994-02-18 1999-11-16 Imedge Technology Inc. Topographical object detection system
US5506929A (en) 1994-10-19 1996-04-09 Clio Technologies, Inc. Light expanding system for producing a linear or planar light beam from a point-like light source
US5731853A (en) 1995-02-24 1998-03-24 Matsushita Electric Industrial Co., Ltd. Display device
JP3658034B2 (en) 1995-02-28 2005-06-08 キヤノン株式会社 Image observation optical system and imaging optical system
US5621529A (en) 1995-04-05 1997-04-15 Intelligent Automation Systems, Inc. Apparatus and method for projecting laser pattern with reduced speckle noise
US5831700A (en) 1995-05-19 1998-11-03 Kent State University Polymer stabilized four domain twisted nematic liquid crystal display
EP0764865B1 (en) 1995-09-21 2003-07-30 U.S. Precision Lens Inc. Projection television lens system
EP1798592A3 (en) 1996-01-17 2007-09-19 Nippon Telegraph And Telephone Corporation Optical device and three-dimensional display device
US5963375A (en) 1996-01-31 1999-10-05 U.S. Precision Lens Inc. Athermal LCD projection lens
US6166834A (en) 1996-03-15 2000-12-26 Matsushita Electric Industrial Co., Ltd. Display apparatus and method for forming hologram suitable for the display apparatus
US5841587A (en) 1996-04-29 1998-11-24 U.S. Precision Lens Inc. LCD projection lens
US5870228A (en) 1996-05-24 1999-02-09 U.S. Precision Lens Inc. Projection lenses having larger back focal length to focal length ratios
US6867888B2 (en) 1996-07-12 2005-03-15 Science Applications International Corporation Switchable polymer-dispersed liquid crystal optical elements
US5942157A (en) 1996-07-12 1999-08-24 Science Applications International Corporation Switchable volume hologram materials and devices
US5856842A (en) 1996-08-26 1999-01-05 Kaiser Optical Systems Corporation Apparatus facilitating eye-contact video communications
FR2755530B1 (en) * 1996-11-05 1999-01-22 Thomson Csf Visualization device and flat television screen using the same
US5875012A (en) 1997-01-31 1999-02-23 Xerox Corporation Broadband reflective display, and methods of forming the same
US6133971A (en) 1997-01-31 2000-10-17 Xerox Corporation Holographically formed reflective display, liquid crystal display and projection system and methods of forming the same
US6567573B1 (en) 1997-02-12 2003-05-20 Digilens, Inc. Switchable optical components
US5930433A (en) 1997-07-23 1999-07-27 Hewlett-Packard Company Waveguide array document scanner
JP2000056259A (en) 1998-08-10 2000-02-25 Fuji Xerox Co Ltd Picture display device
US6169594B1 (en) 1998-08-24 2001-01-02 Physical Optics Corporation Beam deflector and scanner
WO2000016136A1 (en) 1998-09-14 2000-03-23 Digilens, Inc. Holographic illumination system and holographic projection system
AU6428199A (en) * 1998-10-16 2000-05-08 Digilens Inc. Holographic display system
US6082862A (en) 1998-10-16 2000-07-04 Digilens, Inc. Image tiling technique based on electrically switchable holograms
US6414760B1 (en) 1998-10-29 2002-07-02 Hewlett-Packard Company Image scanner with optical waveguide and enhanced optical sampling rate
JP2000267042A (en) 1999-03-17 2000-09-29 Fuji Xerox Co Ltd Head-mounted type video display device
JP2000267552A (en) 1999-03-19 2000-09-29 Sony Corp Device and method for image recording and recording medium
US6504629B1 (en) 1999-03-23 2003-01-07 Digilens, Inc. Method and apparatus for illuminating a display
JP2001093179A (en) 1999-09-21 2001-04-06 Pioneer Electronic Corp Optical pickup
AU6262501A (en) * 2000-05-29 2001-12-11 Vkb Inc. Virtual data entry device and method for input of alphanumeric and other data
EP1295163B1 (en) 2000-06-05 2010-07-07 Lumus Ltd Substrate-guided optical beam expander
US20030190612A1 (en) 2000-08-31 2003-10-09 Nobuko Yamamoto Detecting method and detection substrate for use therein
JP4727034B2 (en) 2000-11-28 2011-07-20 オリンパス株式会社 Observation optical system and imaging optical system
US6625381B2 (en) 2001-02-20 2003-09-23 Eastman Kodak Company Speckle suppressed laser projection system with partial beam reflection
US6600590B2 (en) 2001-02-20 2003-07-29 Eastman Kodak Company Speckle suppressed laser projection system using RF injection
GB0108838D0 (en) 2001-04-07 2001-05-30 Cambridge 3D Display Ltd Far field display
FI20010778A (en) 2001-04-12 2002-10-13 Nokia Corp Optical switching arrangement
US7009773B2 (en) 2001-05-23 2006-03-07 Research Foundation Of The University Of Central Florida, Inc. Compact microlenslet arrays imager
US6594090B2 (en) 2001-08-27 2003-07-15 Eastman Kodak Company Laser projection display system
US6833955B2 (en) 2001-10-09 2004-12-21 Planop Planar Optics Ltd. Compact two-plane optical device
US6577429B1 (en) 2002-01-15 2003-06-10 Eastman Kodak Company Laser projection display system
EP1347641A1 (en) * 2002-03-19 2003-09-24 Siemens Aktiengesellschaft Free projection display device
IL148804A (en) 2002-03-21 2007-02-11 Yaacov Amitai Optical device
KR20030088217A (en) 2002-05-13 2003-11-19 삼성전자주식회사 Wearable display system enabling adjustment of magnfication
ITTO20020625A1 (en) 2002-07-17 2004-01-19 Fiat Ricerche Light guide for the type of display devices "head-mounted" or "head-up"
US6805490B2 (en) 2002-09-30 2004-10-19 Nokia Corporation Method and system for beam expansion in a display device
FI114946B (en) 2002-12-16 2005-01-31 Nokia Corp Diffractive grating element for balancing diffraction efficiency
JP3873892B2 (en) 2003-01-22 2007-01-31 コニカミノルタホールディングス株式会社 Video display device
WO2004102226A2 (en) 2003-05-09 2004-11-25 Sbg Labs, Inc. Switchable viewfinder display
FI115169B (en) 2003-05-13 2005-03-15 Nokia Corp Method and optical system for coupling light to a waveguide
GB2403814A (en) 2003-07-10 2005-01-12 Ocuity Ltd Directional display apparatus with birefringent lens structure
IL157837A (en) 2003-09-10 2012-12-31 Yaakov Amitai Substrate-guided optical device particularly for three-dimensional displays
CN1914556B (en) 2004-01-29 2010-05-26 松下电器产业株式会社 Light source device, and two-dimensional image display unit
JP5119667B2 (en) 2004-03-29 2013-01-16 ソニー株式会社 Optical device and virtual image display device
US20050232530A1 (en) 2004-04-01 2005-10-20 Jason Kekas Electronically controlled volume phase grating devices, systems and fabrication methods
WO2005111669A1 (en) 2004-05-17 2005-11-24 Nikon Corporation Optical element, combiner optical system, and image display unit
IL162573A (en) 2004-06-17 2013-05-30 Lumus Ltd Substrate-guided optical device with very wide aperture
IL162572A (en) 2004-06-17 2013-02-28 Lumus Ltd High brightness optical device
EP1783537A4 (en) 2004-07-20 2009-09-02 Asahi Glass Co Ltd Liquid crystal lens element and optical head device
IL163361A (en) 2004-08-05 2011-06-30 Lumus Ltd Optical device for light coupling into a guiding substrate
US7075273B2 (en) 2004-08-24 2006-07-11 Motorola, Inc. Automotive electrical system configuration using a two bus structure
US20060126181A1 (en) 2004-12-13 2006-06-15 Nokia Corporation Method and system for beam expansion in a display device
US7206107B2 (en) 2004-12-13 2007-04-17 Nokia Corporation Method and system for beam expansion in a display device
JP4995732B2 (en) 2004-12-13 2012-08-08 ノキア コーポレイション System and method for near-focus ray expansion in a display device
EP1828832B1 (en) 2004-12-13 2013-05-22 Nokia Corporation General diffractive optics method for expanding an exit pupil
JP2008533507A (en) 2005-02-10 2008-08-21 ラマス リミテッド Substrate guiding optical device especially for vision enhancement optical system
US10073264B2 (en) 2007-08-03 2018-09-11 Lumus Ltd. Substrate-guide optical device
EP1849033B1 (en) 2005-02-10 2019-06-19 Lumus Ltd Substrate-guided optical device utilizing thin transparent layer
IL166799A (en) 2005-02-10 2014-09-30 Lumus Ltd Substrate-guided optical device utilizing beam splitters
US7325928B2 (en) 2005-02-14 2008-02-05 Intel Corporation Resolution multiplication technique for projection display systems
WO2006102073A2 (en) 2005-03-18 2006-09-28 Sbg Labs, Inc. Spatial light modulator
JP4612853B2 (en) * 2005-03-29 2011-01-12 キヤノン株式会社 Pointed position recognition device and information input device having the same
EP1938152B1 (en) 2005-06-03 2012-08-15 Nokia Corporation General diffractive optics method for expanding an exit pupil
JP4655771B2 (en) 2005-06-17 2011-03-23 ソニー株式会社 Optical device and virtual image display device
US9081178B2 (en) 2005-09-07 2015-07-14 Bae Systems Plc Projection display for displaying an image to a viewer
AT447726T (en) 2005-09-07 2009-11-15 Bae Systems Plc Projection display with a stable waveguide with rectangular cross-section and a plate-based waveguide, which have each mounting grille
JP4810949B2 (en) * 2005-09-29 2011-11-09 ソニー株式会社 Optical device and image display device
US8018579B1 (en) 2005-10-21 2011-09-13 Apple Inc. Three-dimensional imaging and display system
IL171820A (en) 2005-11-08 2014-04-30 Lumus Ltd Polarizing optical device for light coupling
GB0522968D0 (en) 2005-11-11 2005-12-21 Popovich Milan M Holographic illumination device
US20070153358A1 (en) 2005-12-22 2007-07-05 Solbeam, Inc. Dispersive electro-optic prism
IL173715D0 (en) 2006-02-14 2007-03-08 Lumus Ltd Substrate-guided imaging lens
KR101241770B1 (en) 2006-02-17 2013-03-14 삼성디스플레이 주식회사 Stereo-scopic image conversion panel and stereo-scopic image display apparatus having the same
US7499217B2 (en) 2006-03-03 2009-03-03 University Of Central Florida Research Foundation, Inc. Imaging systems for eyeglass-based display devices
WO2007130130A2 (en) 2006-04-06 2007-11-15 Sbg Labs Inc. Method and apparatus for providing a transparent display
US7740387B2 (en) 2006-05-24 2010-06-22 3M Innovative Properties Company Backlight wedge with side mounted light source
EP2035881B8 (en) 2006-06-02 2013-11-13 Nokia Corporation Color distribution in exit pupil expanders
WO2007141589A1 (en) 2006-06-02 2007-12-13 Nokia Corporation Stereoscopic exit pupil expander display
WO2007141588A1 (en) 2006-06-02 2007-12-13 Nokia Corporation Split exit pupil expander
KR101229019B1 (en) 2006-06-30 2013-02-15 엘지디스플레이 주식회사 Liquid crystal display device and driving circuit of the same
IL177618A (en) 2006-08-22 2015-02-26 Lumus Ltd Substrate- guided optical device
WO2008038058A1 (en) 2006-09-28 2008-04-03 Nokia Corporation Beam expansion with three-dimensional diffractive elements
GB0619226D0 (en) 2006-09-29 2006-11-08 Cambridge Flat Projection Efficient wedge projection
GB0619366D0 (en) 2006-10-02 2006-11-08 Cambridge Flat Projection Distortionless wedge projection
US8155489B2 (en) 2006-11-02 2012-04-10 Nokia Corporation Method for coupling light into a thin planar waveguide
US8160411B2 (en) 2006-12-28 2012-04-17 Nokia Corporation Device for expanding an exit pupil in two dimensions
EP2128694B1 (en) 2007-03-19 2014-02-26 Panasonic Corporation Laser illuminating device and image display device
WO2008129539A2 (en) 2007-04-22 2008-10-30 Lumus Ltd. A collimating optical device and system
US20080297731A1 (en) 2007-06-01 2008-12-04 Microvision, Inc. Apparent speckle reduction apparatus and method for mems laser projection system
EP3667399A1 (en) 2007-06-04 2020-06-17 Magic Leap, Inc. A diffractive beam expander
US7589901B2 (en) 2007-07-10 2009-09-15 Microvision, Inc. Substrate-guided relays for use with scanned beam light sources
JP5092609B2 (en) 2007-08-01 2012-12-05 ソニー株式会社 Image display apparatus and driving method thereof
US7672549B2 (en) 2007-09-10 2010-03-02 Banyan Energy, Inc. Solar energy concentrator
GB0718706D0 (en) * 2007-09-25 2007-11-07 Creative Physics Ltd Method and apparatus for reducing laser speckle
AU2008313502A1 (en) 2007-10-18 2009-04-23 Bae Systems Plc Improvements in or relating to head mounted display systems
US7969657B2 (en) 2007-10-25 2011-06-28 University Of Central Florida Research Foundation, Inc. Imaging systems for eyeglass-based display devices
CA2703642C (en) 2007-10-26 2018-01-09 Corporation For Laser Optics Research Laser illuminated backlight for flat panel displays
US20090128495A1 (en) 2007-11-20 2009-05-21 Microsoft Corporation Optical input device
JP4450058B2 (en) 2007-11-29 2010-04-14 ソニー株式会社 Image display device
JP4395802B2 (en) 2007-11-29 2010-01-13 ソニー株式会社 Image display device
US8830584B2 (en) 2007-12-17 2014-09-09 Nokia Corporation Exit pupil expanders with spherical and aspheric substrates
WO2009077774A1 (en) 2007-12-18 2009-06-25 Bae Systems Plc Improvements in or relating to projection displays
WO2009077772A1 (en) 2007-12-18 2009-06-25 Bae Systems Plc Improvemements in or relating to display projectors
US8508848B2 (en) 2007-12-18 2013-08-13 Nokia Corporation Exit pupil expanders with wide field-of-view
DE102008005817A1 (en) 2008-01-24 2009-07-30 Carl Zeiss Ag Optical display device
EP2110701A1 (en) 2008-04-14 2009-10-21 BAE Systems PLC Improvements in or relating to waveguides
AU2009237502A1 (en) 2008-04-14 2009-10-22 Bae Systems Plc Improvements in or relating to waveguides
EP2286144A2 (en) 2008-05-05 2011-02-23 3M Innovative Properties Company Light source module
JP4518193B2 (en) 2008-06-10 2010-08-04 ソニー株式会社 Optical device and virtual image display device
JP4706737B2 (en) 2008-08-18 2011-06-22 ソニー株式会社 Image display device
WO2010023444A1 (en) 2008-08-27 2010-03-04 Milan Momcilo Popovich Laser display incorporating speckle reduction
EP2329302B1 (en) 2008-09-16 2019-11-06 BAE Systems PLC Improvements in or relating to waveguides
US7949214B2 (en) 2008-11-06 2011-05-24 Microvision, Inc. Substrate guided relay with pupil expanding input coupler
US9465213B2 (en) 2008-12-12 2016-10-11 Bae Systems Plc Waveguides
US8965152B2 (en) 2008-12-12 2015-02-24 Bae Systems Plc Waveguides
WO2010067117A1 (en) 2008-12-12 2010-06-17 Bae Systems Plc Improvements in or relating to waveguides
US8587734B2 (en) 2009-03-06 2013-11-19 The Curators Of The University Of Missouri Adaptive lens for vision correction
US20100231498A1 (en) 2009-03-13 2010-09-16 Microsoft Corporation Image display via multiple light guide sections
ES2644595T3 (en) 2009-04-14 2017-11-29 Bae Systems Plc Optical waveguide and display device
ES2621820T3 (en) 2009-04-20 2017-07-05 Bae Systems Plc Surface relief grid in an optical waveguide with a reflective surface and a surface-adapted dielectric layer
WO2010122329A1 (en) 2009-04-20 2010-10-28 Bae Systems Plc Improvements in optical waveguides
WO2010125337A2 (en) 2009-04-27 2010-11-04 Milan Momcilo Popovich Compact holographic edge illuminated wearable display
CA2760382C (en) 2009-04-29 2017-11-07 Bae Systems Plc Head mounted display
US8194325B2 (en) 2009-06-30 2012-06-05 Nokia Corporation Optical apparatus and method
US8354640B2 (en) 2009-09-11 2013-01-15 Identix Incorporated Optically based planar scanner
US8233204B1 (en) 2009-09-30 2012-07-31 Rockwell Collins, Inc. Optical displays
WO2011042711A2 (en) 2009-10-09 2011-04-14 Milan Momcilo Popovich Compact edge illuminated diffractive display
US8885112B2 (en) 2009-10-27 2014-11-11 Sbg Labs, Inc. Compact holographic edge illuminated eyeglass display
US8698705B2 (en) 2009-12-04 2014-04-15 Vuzix Corporation Compact near eye display with scanned image generation
US20130021586A1 (en) 2010-12-07 2013-01-24 Laser Light Engines Frequency Control of Despeckling
WO2011073673A1 (en) 2009-12-17 2011-06-23 Bae Systems Plc Projector lens assembly
WO2011089433A1 (en) 2010-01-25 2011-07-28 Bae Systems Plc Projection display
WO2011107831A1 (en) 2010-03-04 2011-09-09 Nokia Corporation Optical apparatus and method for expanding an exit pupil
CN102859429B (en) 2010-04-19 2016-05-11 西铁城控股株式会社 The manufacture method of the lens before edging and edging lens
ES2738499T3 (en) 2010-04-23 2020-01-23 Bae Systems Plc Optical waveguide and display device
JP5488226B2 (en) 2010-06-10 2014-05-14 富士通オプティカルコンポーネンツ株式会社 Mach-Zehnder type optical modulator
US8649099B2 (en) 2010-09-13 2014-02-11 Vuzix Corporation Prismatic multiple waveguide for near-eye display
US8582206B2 (en) 2010-09-15 2013-11-12 Microsoft Corporation Laser-scanning virtual image display
US8376548B2 (en) 2010-09-22 2013-02-19 Vuzix Corporation Near-eye display with on-axis symmetry
US8859412B2 (en) 2011-04-06 2014-10-14 VerLASE TECHNOLOGIES LLC Optoelectronic device containing at least one active device layer having a wurtzite crystal structure, and methods of making same
KR20140046419A (en) 2011-05-16 2014-04-18 베르라세 테크놀러지스 엘엘씨 Resonator-enhanced optoelectronic devices and methods of making same
KR101908468B1 (en) 2011-06-27 2018-10-17 삼성디스플레이 주식회사 Display panel
US8672486B2 (en) 2011-07-11 2014-03-18 Microsoft Corporation Wide field-of-view projector
US8988474B2 (en) 2011-07-18 2015-03-24 Microsoft Technology Licensing, Llc Wide field-of-view virtual image projector
US9983361B2 (en) 2011-08-08 2018-05-29 Greg S. Laughlin GRIN-lensed, tuned wedge waveguide termination and method of reducing back reflection caused thereby
GB201114149D0 (en) 2011-08-17 2011-10-05 Bae Systems Plc Projection display
US8548290B2 (en) 2011-08-23 2013-10-01 Vuzix Corporation Dynamic apertured waveguide for near-eye display
US10670876B2 (en) 2011-08-24 2020-06-02 Digilens Inc. Waveguide laser illuminator incorporating a despeckler
WO2013027004A1 (en) 2011-08-24 2013-02-28 Milan Momcilo Popovich Wearable data display
GB201114771D0 (en) 2011-08-26 2011-10-12 Bae Systems Plc A display
EP2751611B1 (en) 2011-08-29 2018-01-10 Vuzix Corporation Controllable waveguide for near-eye display applications
US8998414B2 (en) 2011-09-26 2015-04-07 Microsoft Technology Licensing, Llc Integrated eye tracking and display system
US8903207B1 (en) 2011-09-30 2014-12-02 Rockwell Collins, Inc. System for and method of extending vertical field of view in head up display utilizing a waveguide combiner
GB201117029D0 (en) 2011-10-04 2011-11-16 Bae Systems Plc Optical waveguide and display device
KR20140111642A (en) 2011-10-11 2014-09-19 펠리칸 이매징 코포레이션 Lens stack arrays including adaptive optical elements
US8639072B2 (en) 2011-10-19 2014-01-28 Milan Momcilo Popovich Compact wearable display
US8917453B2 (en) 2011-12-23 2014-12-23 Microsoft Corporation Reflective array waveguide
US20150010265A1 (en) 2012-01-06 2015-01-08 Milan, Momcilo POPOVICH Contact image sensor using switchable bragg gratings
US9274338B2 (en) 2012-03-21 2016-03-01 Microsoft Technology Licensing, Llc Increasing field of view of reflective waveguide
US8985803B2 (en) 2012-03-21 2015-03-24 Microsoft Technology Licensing, Llc Freeform-prism eyepiece with illumination waveguide
US8736963B2 (en) 2012-03-21 2014-05-27 Microsoft Corporation Two-dimensional exit-pupil expansion
GB2500631B (en) 2012-03-27 2017-12-27 Bae Systems Plc Improvements in or relating to optical waveguides
US9075184B2 (en) * 2012-04-17 2015-07-07 Milan Momcilo Popovich Compact edge illuminated diffractive display
JP6238965B2 (en) 2012-04-25 2017-11-29 ロックウェル・コリンズ・インコーポレーテッド Holographic wide-angle display
US9389415B2 (en) 2012-04-27 2016-07-12 Leia Inc. Directional pixel for use in a display screen
US9201270B2 (en) 2012-06-01 2015-12-01 Leia Inc. Directional backlight with a modulation layer
US8989535B2 (en) 2012-06-04 2015-03-24 Microsoft Technology Licensing, Llc Multiple waveguide imaging structure
US9310559B2 (en) 2012-06-11 2016-04-12 Magic Leap, Inc. Multiple depth plane three-dimensional display using a wave guide reflector array projector
US10295338B2 (en) 2013-07-12 2019-05-21 Magic Leap, Inc. Method and system for generating map data from an image
US9146407B2 (en) 2012-08-10 2015-09-29 Mitsui Chemicals, Inc. Fail-safe electro-active lenses and methodology for choosing optical materials for fail-safe electro-active lenses
US8731350B1 (en) 2012-09-11 2014-05-20 The United States Of America As Represented By The Secretary Of The Navy Planar-waveguide Bragg gratings in curved waveguides
US20140140653A1 (en) 2012-11-16 2014-05-22 Rockwell Collins, Inc. Transparent waveguide display
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
WO2014080155A1 (en) 2012-11-20 2014-05-30 Milan Momcilo Popovich Waveguide device for homogenizing illumination light
GB2508661A (en) 2012-12-10 2014-06-11 Bae Systems Plc Improved display
WO2014091204A1 (en) 2012-12-10 2014-06-19 Bae Systems Plc Display comprising an optical waveguide and switchable diffraction gratings and method of producing the same
WO2014091200A1 (en) 2012-12-10 2014-06-19 Bae Systems Plc Display comprising an optical waveguide and switchable diffraction gratings and method of producing the same
US10146053B2 (en) 2012-12-19 2018-12-04 Microsoft Technology Licensing, Llc Multiplexed hologram tiling in a waveguide display
US8873149B2 (en) 2013-01-28 2014-10-28 David D. Bohn Projection optical system for coupling image light to a near-eye display
US20140268277A1 (en) 2013-03-14 2014-09-18 Andreas Georgiou Image correction using reconfigurable phase mask
CA2905506A1 (en) 2013-03-15 2014-09-18 Magic Leap, Inc. Display system and method
GB201305691D0 (en) 2013-03-28 2013-05-15 Bae Systems Plc Improvements in and relating to displays
US8913865B1 (en) 2013-06-27 2014-12-16 Microsoft Corporation Waveguide including light turning gaps
US9664905B2 (en) 2013-06-28 2017-05-30 Microsoft Technology Licensing, Llc Display efficiency optimization by color filtering
WO2015006784A2 (en) 2013-07-12 2015-01-15 Magic Leap, Inc. Planar waveguide apparatus with diffraction element(s) and system employing same
WO2015015138A1 (en) 2013-07-31 2015-02-05 Milan Momcilo Popovich Method and apparatus for contact image sensing
US9164290B2 (en) 2013-11-06 2015-10-20 Microsoft Corporation Grating configurations for a tiled waveguide display
JP6430516B2 (en) 2013-12-19 2018-11-28 ビ−エイイ− システムズ パブリック リミテッド カンパニ−BAE SYSTEMS plc Improvements in and related to waveguides
KR20160101110A (en) 2013-12-19 2016-08-24 배 시스템즈 피엘시 Improvements in and relating to waveguides
US9459451B2 (en) 2013-12-26 2016-10-04 Microsoft Technology Licensing, Llc Eye tracking apparatus, method and system
JP6201836B2 (en) 2014-03-14 2017-09-27 ソニー株式会社 Optical device and method for assembling the same, hologram diffraction grating, display device and alignment device
WO2015145119A1 (en) 2014-03-24 2015-10-01 Wave Optics Ltd Display system
US10048647B2 (en) 2014-03-27 2018-08-14 Microsoft Technology Licensing, Llc Optical waveguide including spatially-varying volume hologram
NO2788478T3 (en) 2014-08-03 2018-01-20
US9377623B2 (en) 2014-08-11 2016-06-28 Microsoft Technology Licensing, Llc Waveguide eye tracking employing volume Bragg grating
US20160077338A1 (en) 2014-09-16 2016-03-17 Steven John Robbins Compact Projection Light Engine For A Diffractive Waveguide Display
US9494799B2 (en) 2014-09-24 2016-11-15 Microsoft Technology Licensing, Llc Waveguide eye tracking employing switchable diffraction gratings
JP2017531840A (en) 2014-09-29 2017-10-26 マジック リープ,インコーポレイティド Structure and method for outputting light of different wavelengths from a waveguide
EP3243092A4 (en) 2015-01-10 2018-09-19 LEIA Inc. Grating coupled light guide
JP2018508932A (en) 2015-01-10 2018-03-29 レイア、インコーポレイテッドLeia Inc. Grating-based backlighting with controlled diffractive coupling efficiency
JP6567058B2 (en) 2015-01-10 2019-08-28 レイア、インコーポレイテッドLeia Inc. 2D / 3D (2D / 3D) switchable display backlight and electronic display
WO2016113534A1 (en) 2015-01-12 2016-07-21 Milan Momcilo Popovich Environmentally isolated waveguide display
EP3245551B1 (en) 2015-01-12 2019-09-18 DigiLens Inc. Waveguide light field displays
CN107209393A (en) 2015-01-28 2017-09-26 镭亚股份有限公司 It is three-dimensional(3D)Electronic console
US9423360B1 (en) 2015-02-09 2016-08-23 Microsoft Technology Licensing, Llc Optical components
US10018844B2 (en) 2015-02-09 2018-07-10 Microsoft Technology Licensing, Llc Wearable image display system
US9372347B1 (en) 2015-02-09 2016-06-21 Microsoft Technology Licensing, Llc Display system
US20180246354A1 (en) 2015-02-23 2018-08-30 Digilens, Inc. Electrically focus-tunable lens
WO2016146963A1 (en) 2015-03-16 2016-09-22 Popovich, Milan, Momcilo Waveguide device incorporating a light pipe
US9864208B2 (en) 2015-07-30 2018-01-09 Microsoft Technology Licensing, Llc Diffractive optical elements with varying direction for depth modulation
US10038840B2 (en) 2015-07-30 2018-07-31 Microsoft Technology Licensing, Llc Diffractive optical element using crossed grating for pupil expansion
US10690916B2 (en) 2015-10-05 2020-06-23 Digilens Inc. Apparatus for providing waveguide displays with two-dimensional pupil expansion
US10429645B2 (en) 2015-10-07 2019-10-01 Microsoft Technology Licensing, Llc Diffractive optical element with integrated in-coupling, exit pupil expansion, and out-coupling
US9946072B2 (en) 2015-10-29 2018-04-17 Microsoft Technology Licensing, Llc Diffractive optical element with uncoupled grating structures
US9791696B2 (en) 2015-11-10 2017-10-17 Microsoft Technology Licensing, Llc Waveguide gratings to improve intensity distributions
US9915825B2 (en) 2015-11-10 2018-03-13 Microsoft Technology Licensing, Llc Waveguides with embedded components to improve intensity distributions
WO2017162999A1 (en) 2016-03-24 2017-09-28 Popovich Milan Momcilo Method and apparatus for providing a polarization selective holographic waveguide device
US10025093B2 (en) 2016-04-13 2018-07-17 Microsoft Technology Licensing, Llc Waveguide-based displays with exit pupil expander
US9791703B1 (en) 2016-04-13 2017-10-17 Microsoft Technology Licensing, Llc Waveguides with extended field of view

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10642058B2 (en) 2011-08-24 2020-05-05 Digilens Inc. Wearable data display
US10670876B2 (en) 2011-08-24 2020-06-02 Digilens Inc. Waveguide laser illuminator incorporating a despeckler

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US20200057353A1 (en) 2020-02-20
US20170356801A1 (en) 2017-12-14
WO2011042711A2 (en) 2011-04-14
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US10409144B2 (en) 2019-09-10
US20200033190A1 (en) 2020-01-30
US9726540B2 (en) 2017-08-08
US20150285682A1 (en) 2015-10-08

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