[go: up one dir, main page]

WO2006054056A1 - Selecteur de lumiere pour affichages de projection plats - Google Patents

Selecteur de lumiere pour affichages de projection plats Download PDF

Info

Publication number
WO2006054056A1
WO2006054056A1 PCT/GB2005/004381 GB2005004381W WO2006054056A1 WO 2006054056 A1 WO2006054056 A1 WO 2006054056A1 GB 2005004381 W GB2005004381 W GB 2005004381W WO 2006054056 A1 WO2006054056 A1 WO 2006054056A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
rays
angle
array
slits
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.)
Ceased
Application number
PCT/GB2005/004381
Other languages
English (en)
Inventor
Adrian Robert Leigh Travis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cambridge Flat Projection Displays Ltd
Original Assignee
Cambridge Flat Projection Displays Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cambridge Flat Projection Displays Ltd filed Critical Cambridge Flat Projection Displays Ltd
Publication of WO2006054056A1 publication Critical patent/WO2006054056A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/28—Reflectors in projection beam
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G03B21/62—Translucent screens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide

Definitions

  • This invention is concerned principally with light- selecting or redirecting devices such as diffusers for flat projection displays or cameras. ⁇
  • Rear-projection televisions are less expensive than plasma displays or liquid-crystal displays, but are bulky.
  • WO 01/72037 by the present- inventor describes how to make a thin projection display by pointing a video projector into the thick end of a lightguide in the form of a wedge-shaped or tapered sheet.
  • the injected light bounces off the faces of the lightguide at ever steeper angles, until it exceeds the initial angle and escapes.
  • the greater the difference between the injection angle of a ray and the critical angle the more times the ray must reflect internally off the faces of the guide before it emerges from the surface of the waveguide.
  • the angle of injection therefore determines how far a ray is from the point of input when it emerges from the face of the guide, so that a magnified version of the projected image appears on the face of the guide.
  • Wedge-shaped lightguides are commonly used, as shown for instance in EP 663600 (Nitto Jushi), to spread the illumination from a fluorescent tube across the rear face of a liquid-crystal display, and rays emerge travelling towards the tip, but with varying degrees of divergence from the plane of the wedge.
  • a film of extruded prisms such as that shown in Figure 1 and described for instance in EP 762183, is commonly placed with the prisms against the lightguide so as to bend rays round approximately to the perpendicular angle, from which liquid-crystal displays are usually viewed.
  • This technique can be applied to projector displays or, as described in the inventor's earlier WO 02/45413, cameras, but the requirements are stricter because scattered light should be suppressed.
  • the diffusive screens commonly used in rear-projection television are most effective when light is normally incident, so a Fresnel lens is often placed behind a diffusive screen as shown in Figure 2 so as to collimate light from the video projector.
  • the diffusive screen often comprises on one side an array of lenslets and on the other side an array of slits, the lenslets being arranged to condense the light through the slits. This has the dual advantage of both diffusing the light with a controllable angle of divergence, and providing a front surface which is mostly black so that ambient illumination does not degrade contrast.
  • Conventional wedge-shaped or tapered lightguides emit light travelling towards the tip, nearly parallel to the surface, because the light has only just escaped the total-internal- reflection regime. As a result the emission is ill prepared for the kind of diffuser conventionally used in rear-projection television. This is not only because rays travel in the wrong direction to be collimated by the Fresnel lens. It is also because, as explained in the applicant's earlier WO 02/060187, conventional wedge lightguides have straight sides (i.e. flat faces), so the emerging rays have periodic angles of divergence, which means that they cannot be collimated so as to be normally incident on the diffusive screen.
  • a wedge lightguide can be made to work as a flat-panel camera, as is explained in WO 02/45413.
  • ghost images are formed in the flat-panel camera for the same reason as in flat projection: rays are partially reflected when incident on a dielectric interface.
  • WO 03/013151 also by the present applicant, explains how to design a tapered lightguide so that the emitted rays are all close to parallel. It also explains why the angle at which ghost rays emerge into air is substantially different from that of the wanted rays, and shows how a set of louvers aligned to pass the wanted rays will absorb the ' ghost rays. However, this arrangement does not take advantage of all the technology that has been developed to make diffusive screens for rear-projection television.
  • a transparent screen comprising means for deflecting rays incident at glancing angles on the rear face of the screen through a given angle into the screen towards its normal, means for condensing the rays onto an array of points on the front face of the screen, and means for absorbing substantially- all rays except those originally incident on the rear face at a glancing angle.
  • front and rear are intended to refer to the relation to a viewer.
  • the screen is preferably used with a tapered waveguide to make a camera or projector.
  • tapered is to be taken to include any profile that makes internal bounces progressively steeper; this can also be done by GRIN techniques, for instance.
  • Light emerging at the intended place from such a tapered panel will always be at this glancing angle, because it is the first "bounce" to be just steep enough relative to the surface of the panel to escape the total-internal-reflection regime and thus to emerge.
  • the glancing angle is just less than the arcsin of the reciprocal of the refractive index of the material through which the ray is travelling.
  • the deflecting means can be an array of prisms, for instance, arranged in parallel fashion transverse to the direction of propagation through the tapered waveguide. Alternatively it can be a mirror-type array, preferably embedded in a transparent material.
  • the condensing means can be the same as or separate from the deflecting means and would normally include curved reflecting or refracting surfaces focussing parallel rays in transverse strips onto slit-shaped apertures in a light-absorbent material.
  • the absorbing means can also act in the usual way to absorb ambient light.
  • Figure 1 shows the prismatic sheet conventionally used with a wedge lightguide in the backlight of a liquid-crystal display
  • Figure 2 shows a particular kind of diffuser that is sometimes used in conjunction with a Fresnel lens in rear-projection televisions
  • Figure 3 shows a first embodiment of this invention comprising a prismatic sheet and a lenslet array on which is printed a pattern of slits opposite the lenslets;
  • Figure 4 shows a second embodiment of this invention, in which the pattern of slits is printed on the prismatic sheet opposite the prisms, and one facet of the prisms is curved so as to condense light;
  • Figure 5 shows how the pattern of slits can be separated into two, the combined action of the two layers being such as to absorb skew rays;
  • Figure 6 shows how the slit itself can be embossed with a lens or grating so that it diffuses light with the required angle of divergence;
  • Figure 7 shows how the diffuser can be bonded to the wedge lightguide by a glue of low refractive index
  • Figure 8 shows how the prisms can be curved so as to collimate rays whose wave vector has a component perpendicular to the wedge axis.
  • Figure 3 shows a first embodiment of the present invention, in which there is provided a transparent sheet flat on one face and embossed on the other with a prism array 1 shaped like an extruded sawtooth, and a second transparent sheet embossed on one side - the rear as seen by a viewer - with an array of lenslets 3 facing the flat side of the first sheet, and on the opposite side with an array of slits 2, one opposite each lenslet.
  • the prisms and slits typically have a pitch of about lOO ⁇ m.
  • the prisms 3 of the prism sheet are applied to or placed against the exit face of a tapered waveguide 4 into the thick end of which a projector injects an image, formed by rays 5, whose angle at a given point is a function of row height in the projector image.
  • angles of the prism facets are such that rays emerging from the tapered waveguide 4, which are parallel and incident at a glancing angle on the array and perpendicular to the direction of extrusion, are refracted by the first facet, as the light enters the prism, and reflected by the second so as to emerge approximately perpendicular to the opposite surface of the sheet. These rays then pass through the lenslets 3 and are condensed onto the slits 2 in such a way that that light incident perpendicular to the plane of the sheet is condensed by each lenslet through one slit.
  • the thickness of the sheet thus corresponds to the focal length of the lenslets.
  • the dimensions of the slits are such as to pass substantially all unscattered light emerging from the tapered waveguide display 4 after a specified number of reflections, but to block all scattered light and all light 6 which has undergone any but the specified number of reflections, i.e. the number of reflections at which the light just exceeds the critical angle of incidence.
  • the change in angle within the waveguide of a ray that has undergone one extra double bounce is only marginally greater (e.g. a fraction of a degree) than the previous bounce, the change of angle outside the waveguide is usually much greater (several degrees) , so a high selectivity can be achieved.
  • WO 02/60187 mentioned above.
  • a diffuser which rays pass through after leaving the lenslet and slit array in order to achieve complete diffusion.
  • a second embodiment of the invention is therefore described, as shown in Figure 4, in which there is provided a transparent sheet on one side of which is embossed an extruded array of prisms, one facet 7 of each prism, namely the second one encountered by a ray, being curved so as to condense rays as they undergo refraction and reflection.
  • On the opposite side of the sheet is printed an array of slits 2, and the radius of prism curvature and slit position should be such that parallel rays 5 incident at a glancing angle on the rear of the sheet are fully condensed as they reach the opposite side of the sheet and pass through a slit.
  • the light from a video projector is strongly directional, so that the ratio of the slit width to the focal length of each prism or lenslet can in principle be small. Small slits are difficult to print, but if the focal length of the prisms or lenslets is increased then there is a chance that rays from one prism or lenslet might stray through the slit intended for another. This can be prevented by making the slits very deep so that each acts as a tunnel whose walls absorb any skew rays.
  • Figure 5 shows how the same effect can be achieved by splitting the slit array into two layers, one layer 2a being embedded within the transparent sheet at an appropriate depth below the second layer 2b so as to block both undesired rays 6a and 6b.
  • the slit is embossed with a lenslet or grating 8 so as to diffuse the transient light with the angle of divergence required for diffusion, as shown in Figure 6.
  • the thickness of the lenslet sheet might be comparable to the spacing of the lenslets; the slits run vertically, and a wide diffusion in the horizontal direction - say about 120° - is thus achieved.
  • the sheet thickness might be 1 mm when the width of the lenslets is 0.1 mm, which gives rise to an angle of diffusion of about 9°.
  • the direction of taper is typically vertical and for normal purposes one does not want to diffuse too much in the vertical (because that wastes light) , so the narrow angle of diffusion is quite satisfactory.
  • prisms might be made to condense light are by curving the first surface so that it acts like a lens, or by embossing either the first or second facet or both with a suitable hologram. Furthermore, instead of embossing the bottom of the sheet with prisms one could leave it smooth and replace the prisms with a series of curved mirrors internal to the sheet, all designed to deflect light from the critical angle to the normal, as shown in Figure 7.
  • a graded-index coupling sheet 20 is preferably placed between waveguide and condenser sheet, to reduce losses.
  • the invention is therefore also concerned in another aspect with transparent screens comprising means for deflecting rays incident at glancing angles on the front face of the screen through a given angle into the screen towards its normal, in which the deflecting means comprises elongate elements arranged generally in parallel but curved in the plane of the screen so as to divert rays, emanating from a point source and incident on the screen, uniformly in the said normal direction.
  • Figure 8 also shows an input or "expansion” waveguide 40 which allows the light to spread (or condense) laterally to cover the width of the tapered waveguide, which is much larger than that of the projector.
  • This input waveguide which is flat, can be folded under the main (tapered) waveguide for a compact layout.
  • diffusive elements 8 should be removed from the screen, but the remaining elements 1, 2 and 3 or 7 should be left in place.
  • Light incident on the screen and passing through the slits 2 will be collimated by the lenslets 3 or curved facets 7 and bent by the curved facets 7 or prisms 1 so as to enter the tapered lightguide 4 at an angle, after which the ray will undergo total internal reflection and emerge at a unique angle at the thick end of the lightguide, giving rise to the captured image. Rays that would otherwise be partially reflected at the rear of the wedge 4 so as to cause a ghost image cannot enter the system because they are blocked by the slits 2.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Abstract

Cette invention concerne un écran transparent pour affichages de projection plats qui comprend des moyens tels qu'un réseau de prismes (1) pour renvoyer des rayons incidents selon certains angles obliques sur l'écran dans un angle donné dans l'écran vers sa perpendiculaire. Les rayons sont ensuite condensés à l'aide de moyens adaptés, tels que des facettes courbes (7), en un réseau de points sur le côté éloigné de l'écran, où tous les rayons, hormis ceux initialement incidents à l'arrière à angle oblique, sont absorbés. L'écran peut servir à sélectionner une lumière projetée dans un guide d'ondes à impédance croissante (4) afin que seuls les rayons émis à angle oblique, après la première réflexion à ne pas renvoyer totalement de manière interne, passent à travers les fentes (2). Le dispositif peut fonctionner de manière inverse en tant qu'appareil photo.
PCT/GB2005/004381 2004-11-16 2005-11-15 Selecteur de lumiere pour affichages de projection plats Ceased WO2006054056A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0425215A GB0425215D0 (en) 2004-11-16 2004-11-16 Flat projection diffuser
GB0425215.1 2004-11-16

Publications (1)

Publication Number Publication Date
WO2006054056A1 true WO2006054056A1 (fr) 2006-05-26

Family

ID=33523781

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/004381 Ceased WO2006054056A1 (fr) 2004-11-16 2005-11-15 Selecteur de lumiere pour affichages de projection plats

Country Status (3)

Country Link
GB (1) GB0425215D0 (fr)
TW (1) TW200617571A (fr)
WO (1) WO2006054056A1 (fr)

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2432428A (en) * 2005-11-21 2007-05-23 Young Optics Inc Brightness enhancement film with parallel prisms
US20120041721A1 (en) * 2010-08-12 2012-02-16 Kuan Wen Chen Flat panel display device
US8599483B1 (en) 2012-06-05 2013-12-03 3M Innovative Properties Company High angle rear projection system
US9223138B2 (en) 2011-12-23 2015-12-29 Microsoft Technology Licensing, Llc Pixel opacity for augmented reality
US9297996B2 (en) 2012-02-15 2016-03-29 Microsoft Technology Licensing, Llc Laser illumination scanning
US9304235B2 (en) 2014-07-30 2016-04-05 Microsoft Technology Licensing, Llc Microfabrication
US9368546B2 (en) 2012-02-15 2016-06-14 Microsoft Technology Licensing, Llc Imaging structure with embedded light sources
US9372347B1 (en) 2015-02-09 2016-06-21 Microsoft Technology Licensing, Llc Display system
US9423360B1 (en) 2015-02-09 2016-08-23 Microsoft Technology Licensing, Llc Optical components
US9429692B1 (en) 2015-02-09 2016-08-30 Microsoft Technology Licensing, Llc Optical components
US9513480B2 (en) 2015-02-09 2016-12-06 Microsoft Technology Licensing, Llc Waveguide
US9535253B2 (en) 2015-02-09 2017-01-03 Microsoft Technology Licensing, Llc Display system
US9578318B2 (en) 2012-03-14 2017-02-21 Microsoft Technology Licensing, Llc Imaging structure emitter calibration
US9581820B2 (en) 2012-06-04 2017-02-28 Microsoft Technology Licensing, Llc Multiple waveguide imaging structure
US9678542B2 (en) 2012-03-02 2017-06-13 Microsoft Technology Licensing, Llc Multiple position input device cover
US9717981B2 (en) 2012-04-05 2017-08-01 Microsoft Technology Licensing, Llc Augmented reality and physical games
US9726887B2 (en) 2012-02-15 2017-08-08 Microsoft Technology Licensing, Llc Imaging structure color conversion
US9779643B2 (en) 2012-02-15 2017-10-03 Microsoft Technology Licensing, Llc Imaging structure emitter configurations
US9787576B2 (en) 2014-07-31 2017-10-10 Microsoft Technology Licensing, Llc Propagating routing awareness for autonomous networks
US9827209B2 (en) 2015-02-09 2017-11-28 Microsoft Technology Licensing, Llc Display system
US9904327B2 (en) 2012-03-02 2018-02-27 Microsoft Technology Licensing, Llc Flexible hinge and removable attachment
US10018844B2 (en) 2015-02-09 2018-07-10 Microsoft Technology Licensing, Llc Wearable image display system
US10192358B2 (en) 2012-12-20 2019-01-29 Microsoft Technology Licensing, Llc Auto-stereoscopic augmented reality display
US10191515B2 (en) 2012-03-28 2019-01-29 Microsoft Technology Licensing, Llc Mobile device light guide display
US10254942B2 (en) 2014-07-31 2019-04-09 Microsoft Technology Licensing, Llc Adaptive sizing and positioning of application windows
US10310268B2 (en) 2016-12-06 2019-06-04 Microsoft Technology Licensing, Llc Waveguides with peripheral side geometries to recycle light
US10317677B2 (en) 2015-02-09 2019-06-11 Microsoft Technology Licensing, Llc Display system
US10324733B2 (en) 2014-07-30 2019-06-18 Microsoft Technology Licensing, Llc Shutdown notifications
US10388073B2 (en) 2012-03-28 2019-08-20 Microsoft Technology Licensing, Llc Augmented reality light guide display
US10502876B2 (en) 2012-05-22 2019-12-10 Microsoft Technology Licensing, Llc Waveguide optics focus elements
US10592080B2 (en) 2014-07-31 2020-03-17 Microsoft Technology Licensing, Llc Assisted presentation of application windows
US10678743B2 (en) 2012-05-14 2020-06-09 Microsoft Technology Licensing, Llc System and method for accessory device architecture that passes via intermediate processor a descriptor when processing in a low power state
US10678412B2 (en) 2014-07-31 2020-06-09 Microsoft Technology Licensing, Llc Dynamic joint dividers for application windows
US11068049B2 (en) 2012-03-23 2021-07-20 Microsoft Technology Licensing, Llc Light guide display and field of view
US11086216B2 (en) 2015-02-09 2021-08-10 Microsoft Technology Licensing, Llc Generating electronic components

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0572634A (ja) * 1991-09-12 1993-03-26 Seiko Epson Corp 背面投射スクリーン
US6231200B1 (en) * 1995-10-13 2001-05-15 Omron Corporation Surface light source device, elements therefor and apparatus using the same
EP1356673A1 (fr) * 2000-11-25 2003-10-29 Cambridge Flat Projection Displays Limited Affichage a ecran plat achromatique
US20040046870A1 (en) * 2000-11-30 2004-03-11 Leigh Travis Adrian Robert Flat-panel camera
US20040165260A1 (en) * 2001-06-13 2004-08-26 Gunther Haas Back-projection screen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0572634A (ja) * 1991-09-12 1993-03-26 Seiko Epson Corp 背面投射スクリーン
US6231200B1 (en) * 1995-10-13 2001-05-15 Omron Corporation Surface light source device, elements therefor and apparatus using the same
EP1356673A1 (fr) * 2000-11-25 2003-10-29 Cambridge Flat Projection Displays Limited Affichage a ecran plat achromatique
US20040046870A1 (en) * 2000-11-30 2004-03-11 Leigh Travis Adrian Robert Flat-panel camera
US20040165260A1 (en) * 2001-06-13 2004-08-26 Gunther Haas Back-projection screen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 402 (P - 1580) 27 July 1993 (1993-07-27) *

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2432428A (en) * 2005-11-21 2007-05-23 Young Optics Inc Brightness enhancement film with parallel prisms
GB2432428B (en) * 2005-11-21 2008-02-20 Young Optics Inc Brightness enhancement film and backlight module
US20120041721A1 (en) * 2010-08-12 2012-02-16 Kuan Wen Chen Flat panel display device
US8793104B2 (en) * 2010-08-12 2014-07-29 Kuan Wen Chen Flat panel display device
US9223138B2 (en) 2011-12-23 2015-12-29 Microsoft Technology Licensing, Llc Pixel opacity for augmented reality
US9779643B2 (en) 2012-02-15 2017-10-03 Microsoft Technology Licensing, Llc Imaging structure emitter configurations
US9297996B2 (en) 2012-02-15 2016-03-29 Microsoft Technology Licensing, Llc Laser illumination scanning
US9726887B2 (en) 2012-02-15 2017-08-08 Microsoft Technology Licensing, Llc Imaging structure color conversion
US9368546B2 (en) 2012-02-15 2016-06-14 Microsoft Technology Licensing, Llc Imaging structure with embedded light sources
US9684174B2 (en) 2012-02-15 2017-06-20 Microsoft Technology Licensing, Llc Imaging structure with embedded light sources
US9678542B2 (en) 2012-03-02 2017-06-13 Microsoft Technology Licensing, Llc Multiple position input device cover
US10963087B2 (en) 2012-03-02 2021-03-30 Microsoft Technology Licensing, Llc Pressure sensitive keys
US10013030B2 (en) 2012-03-02 2018-07-03 Microsoft Technology Licensing, Llc Multiple position input device cover
US9904327B2 (en) 2012-03-02 2018-02-27 Microsoft Technology Licensing, Llc Flexible hinge and removable attachment
US9578318B2 (en) 2012-03-14 2017-02-21 Microsoft Technology Licensing, Llc Imaging structure emitter calibration
US9807381B2 (en) 2012-03-14 2017-10-31 Microsoft Technology Licensing, Llc Imaging structure emitter calibration
US11068049B2 (en) 2012-03-23 2021-07-20 Microsoft Technology Licensing, Llc Light guide display and field of view
US10191515B2 (en) 2012-03-28 2019-01-29 Microsoft Technology Licensing, Llc Mobile device light guide display
US10388073B2 (en) 2012-03-28 2019-08-20 Microsoft Technology Licensing, Llc Augmented reality light guide display
US9717981B2 (en) 2012-04-05 2017-08-01 Microsoft Technology Licensing, Llc Augmented reality and physical games
US10478717B2 (en) 2012-04-05 2019-11-19 Microsoft Technology Licensing, Llc Augmented reality and physical games
US10678743B2 (en) 2012-05-14 2020-06-09 Microsoft Technology Licensing, Llc System and method for accessory device architecture that passes via intermediate processor a descriptor when processing in a low power state
US10502876B2 (en) 2012-05-22 2019-12-10 Microsoft Technology Licensing, Llc Waveguide optics focus elements
US9581820B2 (en) 2012-06-04 2017-02-28 Microsoft Technology Licensing, Llc Multiple waveguide imaging structure
US8599483B1 (en) 2012-06-05 2013-12-03 3M Innovative Properties Company High angle rear projection system
US10192358B2 (en) 2012-12-20 2019-01-29 Microsoft Technology Licensing, Llc Auto-stereoscopic augmented reality display
US10324733B2 (en) 2014-07-30 2019-06-18 Microsoft Technology Licensing, Llc Shutdown notifications
US9304235B2 (en) 2014-07-30 2016-04-05 Microsoft Technology Licensing, Llc Microfabrication
US10592080B2 (en) 2014-07-31 2020-03-17 Microsoft Technology Licensing, Llc Assisted presentation of application windows
US9787576B2 (en) 2014-07-31 2017-10-10 Microsoft Technology Licensing, Llc Propagating routing awareness for autonomous networks
US10254942B2 (en) 2014-07-31 2019-04-09 Microsoft Technology Licensing, Llc Adaptive sizing and positioning of application windows
US10678412B2 (en) 2014-07-31 2020-06-09 Microsoft Technology Licensing, Llc Dynamic joint dividers for application windows
US9423360B1 (en) 2015-02-09 2016-08-23 Microsoft Technology Licensing, Llc Optical components
US10317677B2 (en) 2015-02-09 2019-06-11 Microsoft Technology Licensing, Llc Display system
US10018844B2 (en) 2015-02-09 2018-07-10 Microsoft Technology Licensing, Llc Wearable image display system
US9827209B2 (en) 2015-02-09 2017-11-28 Microsoft Technology Licensing, Llc Display system
US9535253B2 (en) 2015-02-09 2017-01-03 Microsoft Technology Licensing, Llc Display system
US9513480B2 (en) 2015-02-09 2016-12-06 Microsoft Technology Licensing, Llc Waveguide
US9429692B1 (en) 2015-02-09 2016-08-30 Microsoft Technology Licensing, Llc Optical components
US9372347B1 (en) 2015-02-09 2016-06-21 Microsoft Technology Licensing, Llc Display system
US11086216B2 (en) 2015-02-09 2021-08-10 Microsoft Technology Licensing, Llc Generating electronic components
US10310268B2 (en) 2016-12-06 2019-06-04 Microsoft Technology Licensing, Llc Waveguides with peripheral side geometries to recycle light

Also Published As

Publication number Publication date
GB0425215D0 (en) 2004-12-15
TW200617571A (en) 2006-06-01

Similar Documents

Publication Publication Date Title
WO2006054056A1 (fr) Selecteur de lumiere pour affichages de projection plats
EP1417843B1 (fr) Unite d'affichage a panneau plat utilisant un guide d'ondes cuneiforme
CN1217539C (zh) 一种光学系统和光学调制装置
US6474827B2 (en) Image display apparatus
KR101422872B1 (ko) 플랫 패널 광 가이드, 디스플레이 및 카메라 장치
US20070091431A1 (en) Rear projection screen, and rear projection system using the screen
US7976208B2 (en) Flat panel lens
KR20030025817A (ko) 면 광원장치
JPH09105804A (ja) 光制御シート、面光源装置及び液晶表示装置
US6782178B2 (en) Planar optical waveguides for optical panel having gradient refractive index core
US20220357497A1 (en) Optical devices for mitigating ghost images
KR20090075809A (ko) 테이퍼링된 도파관 유형의 광 가이드, 디스플레이 및 카메라 장치
JP5765301B2 (ja) 導光板、面光源装置、透過型表示装置
CN101680611A (zh) 光学部件与使用该光学部件的照明装置、显示装置和电视接收装置
JPH10301110A (ja) 画像表示装置
WO2004109391A1 (fr) Feuille a lentille de fresnel, ecran de transmission et dispositif d'affichage a projection par transparence
JP2005085671A (ja) 導光板及び面光源装置
CN100541323C (zh) 透射屏和背投显示设备
US20060007536A1 (en) Total internal reflection fresnel-lens and devices
KR20080010495A (ko) 양면 프리즘 시트 및 이를 가지는 백라이트 어셈블리
KR20060086497A (ko) 광학 유닛 및 액정표시장치
JP2017208287A (ja) 面光源装置、透過型表示装置
US7777949B2 (en) Laminate screen for a display device
US6603604B2 (en) Screen for projection television
JPH08336091A (ja) 背景映写形のテレビジョン受像機又はビデオモニター

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KN KP KR KZ LC LK LR LS LT LU LV LY MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 05803557

Country of ref document: EP

Kind code of ref document: A1