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WO1997014076A1 - Projecteur - Google Patents

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Publication number
WO1997014076A1
WO1997014076A1 PCT/IL1996/000065 IL9600065W WO9714076A1 WO 1997014076 A1 WO1997014076 A1 WO 1997014076A1 IL 9600065 W IL9600065 W IL 9600065W WO 9714076 A1 WO9714076 A1 WO 9714076A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
polarized
projector according
polarizing beam
splitter
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/IL1996/000065
Other languages
English (en)
Inventor
Shlomo Barak
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.)
Unic View Ltd
Original Assignee
Unic View 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
Priority claimed from US08/543,219 external-priority patent/US5833338A/en
Application filed by Unic View Ltd filed Critical Unic View Ltd
Priority to AU65299/96A priority Critical patent/AU6529996A/en
Priority to JP9514888A priority patent/JPH11513504A/ja
Priority to EP96925058A priority patent/EP0880725A4/fr
Publication of WO1997014076A1 publication Critical patent/WO1997014076A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
    • H04N9/3108—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators by using a single electronic spatial light modulator
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3167—Modulator illumination systems for polarizing the light beam

Definitions

  • the present invention relates to projectors.
  • Various types of video and computer generated information projectors are known. These include, for example, the SharpVision product line commercially avail ⁇ able from Sharp Corporation of Japan.
  • Conventional projectors of this type have achieved significant market penetration but suffer from various disadvantages and limitations .
  • liquid crystal panel projectors lie in the relatively limited amount of light that can be projected. It may be appreci ⁇ ated that the amount of light that can be transmitted through a conventional color liquid crystal panel assem ⁇ bly is limited by the amount of light that can be ab ⁇ sorbed by the liquid crystal panel without degradation of its performance and permanent damage thereto inter alia mainly due to overheating. Accordingly the bright ⁇ ness of projected images produced by such projectors is correspondingly limited.
  • the present invention seeks to provide an improved projector which is highly efficient in light utilization.
  • a projector comprising: a non-polarized light source; a polarizing beam splitter receiving light from the non-polarized light source; and a selectably actuable polarization rotating light valve having light polarized in one sense from the polarizing beam-splitter impinging thereon from a first direction and having light polarized in an opposite sense from the polarizing beam-splitter impinging thereon from a second direction.
  • the light polarized in both the one sense and the opposite sense passes therethrough without changes in polarization.
  • the light polarized in both the one sense and the opposite sense passes therethrough with changes in polarization to an extent determined by the actuation.
  • the range of rotation produced by the light valve is from 0 to 90 degrees.
  • the light valve is a liquid crystal light valve from which polarization plates have been removed.
  • the light valve comprises a multi ⁇ plicity of independently electrically actuable regions, corresponding to pixels .
  • the polarizing beam splitter comprises a pair of prisms which are cemented together with multiple dielectric layers therebetween.
  • the beam splitter is a crystallizing polariz ⁇ ing beam splitter.
  • Other suitable types of polarizing beam splitters may also be employed.
  • the projector may be monochromatic or may operate in color.
  • the selectably polarization rotating light valve comprises : a shutter assembly having a multiplicity of pixel light valves; and a color separator disposed on each side of the shutter assembly, intermediate the light source and the shutter assembly and spaced therefrom and providing a plurality of spatially separated differently colored light beams; wherein the plurality of spatially separated differently colored light beams are in predetermined registration with the multiplicity of pixel light valves.
  • a color projector may employ three separate monochromatic light sources, polarizing beam splitters and selectably actuable polarization rotating light valves, whose outputs are combined into a single image.
  • Fig. 1 is a simplified schematic illustration of a projector constructed and operative in accordance with a preferred embodiment of the present invention
  • Figs. 2 and 3 are simplified schematic illus ⁇ trations of the passage of two differently polarized components of one ray of light through part of a projec ⁇ tor constructed and operative in accordance with a pre- ferred embodiment of the present invention in respective first and second operative states;
  • Fig. k is a simplified schematic illustration of a color projector employing three monochromatic subas ⁇ semblies in accordance with an alternative embodiment of the present invention
  • Fig. 5 is a simplified schematic illustration of a color projector employing three monochromatic subas ⁇ semblies in accordance with a further alternative embodi ⁇ ment of the present invention
  • Fig. 6 is a simplified schematic illustration of a color projector employing three monochromatic subas ⁇ semblies in accordance with yet another alternative embodiment of the present invention
  • Fig. 7 is a simplified schematic illustration of a projector constructed and operative in accordance with another preferred embodiment of the present inven ⁇ tion;
  • Fig. 8 is a simplified schematic illustration of a projector constructed and operative in accordance with yet another preferred embodiment of the present invention .
  • Fig. 9 is a simplified schematic illustration of a color projector constructed and operative in accord ⁇ ance with still another preferred embodiment of the present invention.
  • Fig. 10 is an illustration of a projector employing two light valve arrays in a reflective mode in accordance with one embodiment of the present invention
  • Fig. 11 is an illustration of a projector employing two light valve arrays in accordance with another embodiment of the present invention.
  • Fig. 12 is an illustration of a projector employing two light valve arrays in accordance with yet another embodiment of the present invention, which pro ⁇ vides enhanced contrast
  • Fig. 13 is an illustration of a color projec ⁇ tor employing two light valve arrays in accordance with still another embodiment of the present invention, which provides enhanced contrast;
  • Fig. 14 is an illustration of a color projec ⁇ tor employing two light valve arrays in accordance with a further embodiment of the present invention, which pro ⁇ vides enhanced contrast;
  • Fig. 15 is an illustration of the operation of part of the apparatus of Fig. 14;
  • Fig. 16 is an illustration of a color projec ⁇ tor employing two light valve arrays in accordance with a still further embodiment of the present invention.
  • Fig. 17 is an illustration of the operation of part of the apparatus of Fig. 16.
  • Fig. 1 is a simplified schematic illustration of a projector con ⁇ structed and operative in accordance with a preferred embodiment of the present invention.
  • the projector of the present invention comprises a light source 10, such as a metal halide arc lamp manufactured by Osram or Philips combined with a suitable reflector, which outputs a generally collimated beam of light 11 to a polarizing beam splitter 12.
  • the polarizing beam splitter may be any suitable polarizing beam splitter and may be similar to, for example, a broadband polarizing cube beam splitter, commercially available from Melles Griot or a crystal polarizer beam splitter, commercially available from Spindler & Hoyer.
  • the polarizing beam splitter may be based on a liquid crystal layer disposed between a pair of prisms.
  • a polarizing beam splitter which is achromatic and has a large acceptance angle, is commercially available from Philips Key Modules Group, Building SWA 8, 56OO JB Eindhoven, the Netherlands.
  • a prism-type beam splitter is illus ⁇ trated throughout, it is appreciated that a planar type beam splitter is equally applicable.
  • Fig. 1 The operation of the apparatus of Fig. 1 may be best appreciated by a consideration of a number of indi ⁇ vidual differently polarized components of individual rays of light forming beam 11 together with a considera ⁇ tion of Figs. 2 and 3- which show the passage of the differently polarized components of individual rays of light separately through respective actuated and nun- actuated pixels of the light valve array.
  • a first polarized component of a ray of light is reflected by the polarizing beam splitter 12 via a mirror 14 to impinge upon a light valve array 16 in a first direc ⁇ tion, indicated by arrows 18.
  • a second polarized compo ⁇ nent of the same ray of light polarized orthogonally to the first polarized component of light represented by a dashed line and labeled lp, passes through beam splitter 12 and is reflected from a mirror 20 to impinge upon light valve array 16 in a second direction, indicated by arrows 22.
  • the light valve array 16 may be any suitable light valve array and is preferably a liquid crystal light valve array from which the polarization plates thereof have been removed.
  • the liquid crystal light valve array may be monochromatic but is preferably a color array.
  • a preferred embodiment of a color liquid crystal light valve array is described and claimed in applicant/assignee's Published European Patent Applica ⁇ tion 0631434.
  • liquid crystal light valves which are normally aligned at 5 degrees with respect to their frames, it is necessary to rotate such liquid crystal light valves in their respective planes about the optical axis of the system by 5 degrees, such that the resulting polarization will coincide with either the s or the p polarized beam components. It is appreciated that using conventional technology liquid crystal light valves which are aligned parallel to the rows or columns therein may be used for the purposes of the present invention.
  • liquid crystal light valves which are designed to operate in the normally white mode would have the opposite effect and block transmission of light. Accordingly, convention ⁇ al off-the-shelf liquid crystal light valves should be operated in an electrically inverse mode or an additional 90 degree polarization rotator should be employed.
  • Each pixel in the liquid crystal light valve array may be independently electrically controlled to selectably rotate the polarization of light passing therethrough.
  • the selectable polarization causes rotation of light passing therethrough in a range of 0 to O degrees.
  • only two operative states of the light valve array are here considered, namely 0 degr.es rota ⁇ tion and 90 degrees rotation, it being understood that grey scales may be expressed by intermediate anounts of rotation.
  • first polarized component 2s is reflected by the polarizing beam splitter 12 via mirror 14 to impinge upon light valve array 16 in the first direction, indicated by arrows 18.
  • the second polarized component of the same ray of light, polarized orthogonal ⁇ ly to the first polarized component of light represented by a dashed line and labeled 2p passes through beam splitter 12 and is reflected from mirror 20 to impinge upon light valve array 16 in a second direction, indicat ⁇ ed by arrows 22.
  • Both differently polarized components impinge on a pixel which is blank to indicate 0 degree rotation.
  • the 2s component is not converted at the light valve and remains a 2s' component and the 2p component is also not converted and remains a 2p ' component.
  • the 2p ' component is reflected by mirror 14 to pass through beam splitter 12 to the objective lens 24.
  • the 2s' component is reflected by mirror 20 and is reflected at beam split ⁇ ter 12 to the objective lens 24.
  • both differently polarized components of a beam which impinges on an non-actuated pixel of the light valve array 16 are eventually directed to the objective lens.
  • the light valve array 16 should be placed optically equidistant from the objective lens along the light paths of both the p and the s components, such that the objective lens 24 equally images both sides of the light valve array.
  • the light is directed either through an objective lens 24 or reflected back to the light source 10, where it may be used to heat the plasma therein, or alternatively be redirected through the projector. Accordingly the heat accumulation at the light valve array due to light ab ⁇ sorption thereat is minimized.
  • the embodiments described hereinabove may be either monochromatic or color depending on whether color filtration is provided.
  • Fig. 4 which illus ⁇ trates an embodiment of a color projector.
  • three generally identical monochromatic color subassemblies labeled respectively 40, 42 and 44 and each including a polarizing beam splitter 12 and a monochromatic light valve array 16, receive light via dichroic beam splitters 46 from a polychromatic light source 48 which may be identical with light source 10 described hereinabove.
  • Each of the subassemblies may be constructed and operative as described hereinabove with reference to Figs. 1 - 3-
  • the outputs of light downstream of the light valve arrays 16 pass through the respective beam split ⁇ ters 12 of each subassembly and are reflected by mirrors 50 so as to direct the light via dichroic beam combiners 52, and through a single objective lens ⁇ •
  • Fig. 5. which illus ⁇ trates a further alternative embodiment of a color projector.
  • light from a light source 60 passes through a polarizing beam splitter 62.
  • the resulting two mutually orthogonally polarized components of the light are directed to respective dichroic beam splitters 64 and
  • the red, green and blue components are directed by respective mirror pairs 66, 68; 70, 72 and 74, 76 through three respective monochromatic light valve arrays 78, 80 and 82.
  • Light which has passed through one of the three light valve arrays 78, 80 and 82 is recoibined at beam splitter 62 and directed via an objective lens 84 to provide an image output.
  • Each of the subassemblies may be constructed and operative as described hereinabove with reference to Figs. 1 - 3.
  • a light source 90 emits a light beam which impinges on a dichroic beam splitter 92. Blue light reflected therefrom impinges on a polarizing beam splitter 94. The resulting two mutually orthogonally polarized components of the blue light are directed by respective mirrors 96 and 98 via a light valve array 99 and via polarizing beam splitter 94 which directs them to a dichroic beam combiner 100. Beam combiner 100 directs the blue light through an objective lens 102.
  • the red and green components are transmitted through dichroic beam splitter 92 and impinge on a fur ⁇ ther dichroic beam splitter 104.
  • the green component is transmitted therethrough and impinges on a polarizing beam splitter 106.
  • the resulting two mutually orthogonal- ly polarized components of the green light are directed by respective mirrors 108 and 110 via a light valve array 111 and via polarizing beam splitter 106 which directs them to dichroic beam combiner 100, which transmit the green light through objective lens 102.
  • the red component is reflected by the dichroic beam splitter 104 onto a mirror 114 which directs it to a mirror 116, which reflects it onto a polarizing beam splitter 118.
  • the resulting two mutually orthogonally polarized components of the red light are directed by respective mirrors 120 and 122 via a light valve array 123 and via polarizing beam splitter 118 which directs them to dichroic beam combiner 100, which directs the red light through objective lens 102.
  • Fig. 7 which illus ⁇ trates a projector constructed and operative in accord ⁇ ance with another preferred embodiment of the present invention.
  • the projector of Fig. 7 may be identical to that of Fig. 1, with the additional feature that one or both of mirrors 214 and 220 may be adjustably position ⁇ able, dynamically or statically by alignment apparatus 221 and 215 respectively.
  • the remaining elements of the structure are indicated by identical reference numerals.
  • adjustably positionable mirror or mirrors 214 and 220 By using the adjustably positionable mirror or mirrors 214 and 220 one may cause two slightly mutually translated images of a pattern on the light valve array 16 to be projected via objective lens 24. This may pro ⁇ cute depixelization of the resulting image, which is desirable in certain applications, such as video dis ⁇ plays .
  • Fig. 8 illustrates the apparatus of Fig. 7 with the addition of apparatus for dynamically varying the position of mirrors 214 and 220.
  • This apparatus may include, for example, piezoelectric assemblies 222 and 224, as illustrated in Fig. 8.
  • piezoelectric assemblies 222 and 224 as illustrated in Fig. 8.
  • a light source 2 0 projects a beam of light via a color wheel 2 or any other suitable device for sequentially transmitting the R, G and B spectral compo ⁇ nents of the beam, onto a polarizing beam splitter 254.
  • the resulting two mutually orthogonally polarized compo ⁇ nents of the R, G and B spectral components are directed by respective mirrors 25 and 2 8 via a light valve array 260 and via polarizing beam splitter 25 which directs them through an objective lens 262.
  • Fig. 10 which illus ⁇ trates a projector employing two light valve arrays in a reflective mode.
  • Light from a light source 270 impinges on a polarizing beam splitter 272.
  • the resulting two mutually orthogonally polarized components of the light are directed via two separate light valve arrays 27 and 276 and respective quarter wave plates 278 and 280 to respective mirrors 282 and 284.
  • the light is reflected back via respective quarter wave plates 278 and 280 and light valve arrays 274 and 276 to polarizing beam split ⁇ ter 272 and is directed thereby through an objective lens 286.
  • the light valve arrays 274 and 27 both operate in a reflective mode. It is noted that the light valve arrays 27 and 276 do not include polarizers.
  • the light valve arrays should be placed optically equidistant from the objective lens.
  • FIG. 11 is an illustration of a projector employing two light valve arrays in accordance with another embodiment of the present invention.
  • the resulting two mutually orthogonally polarized components of the light p and s are directed via two separate mirrors 304 and 306 and respective light valve arrays 308 and 3 0 to a polarizing beam splitter 312.
  • light valve arrays 308 and 3 0 may be monochromatic or polychromatic. Where the light valve arrays 308 or 3 0 are monochromatic, a poly ⁇ chromatic projector may be realized by combining suitably filtered light passing through three parallel devices of the type illustrated in Fig. 11.
  • FIG. 12 is an illustration of a projector employing two light valve arrays in accordance with yet another embodiment of the present invention, which provides enhanced contrast.
  • the embodiment of Fig. 12 may be identical to that of Fig. 11 and identical elements are shown by the same reference numerals, with the following exception:
  • Mirror 306 is replaced by a polarizing beam splitter 330 which directs the s polarized component via light valve array 310 as in the embodiment of Fig. 11.
  • the polarizing beam splitter 330 is also effective to filter out a residual p component which impinges thereon together with the s component, and directs it in a direc ⁇ tion indicated by an arrow 332, thus removing it from the system and thus enhancing contrast.
  • FIG. 13 is an illustration of a color projector employing two light valve arrays in accordance with still another embodiment of the present invention, which provides enhanced con ⁇ trast.
  • the embodiment of Fig. 13 may be identical to that of Fig. 12 and identical elements are shown by the same reference numerals, with the following exception:
  • a color wheel 340 or any other suitable device for sequentially transmitting the R, G and B spectral components of the beam is located intermediate the light source 300 and the polarizing beam splitter 302. This arrangement can be employed with particular utility when the light valve arrays 308 and 310 are monochromatic, for providing a color projector.
  • FIG. 14 is an illustration of a color projector employing two light valve arrays in accordance with a further embodiment of the present invention, which provides enhanced contrast.
  • the embodiment of Fig. 14 may be identical to that of Fig. 12 and identical elements are shown by the same reference numerals, with the following exception:
  • prism/lens combination arrays 350 and 352 are disposed upstream of respective light valve arrays 308 and 310.
  • the prism/lens combination arrays 350 and 352 may be of the type de ⁇ scribed and claimed in applicant/assignee's Published European Patent Application 0631434.
  • each component of an incom ⁇ ing collimated ray of light 354 is broken down by the prism/lens array 350 into bands of different colors, each of which passes through a separate pixel in light valve 308.
  • This arrangement has substantial benefits in terms of light utilization efficiency as described in applicant/assignee's Published European Patent Applica ⁇ tion 06331434, the disclosure of which is hereby incorpo ⁇ rated by reference.
  • FIG. 16 is an illustration of a color projector employing two light valve arrays in accordance with still another embodiment of the present invention.
  • the embodiment of Fig. 16 may be identical to that of Fig. 11 and identical elements are shown by the same reference numerals, with the fol ⁇ lowing exception:
  • mirror 304 In order to provide greatly enhanced light utilization at the light valves 308 and 310, there are provided in front of mirror 304 a pair of slightly tilted dichroic reflectors 36O and 362. Mirror 304 and dichroic reflectors 3 0 and 362 are together operative to provide a fan of the separate R, G and B components of light, each component being angularly separated from the other.
  • mirror 306 there are provided in front of mirror 306 a pair of slightly tilted dichroic reflectors 364 and 366.
  • Mirror 306 and dichroic reflectors 364 and 366 are together operative to provide a fan of the sepa ⁇ rate R, G and B components of light, each component being angularly separated from the other.
  • each of the R, G and B components of an incoming collimated ray of lignt 38O is focused by the lens array 368 through a separate pixel in light valve 308.
  • This arrangement has substantial benefits in terms of light utilization efficiency as described in applicant/assignee's Published European Patent Application 0633143 , the disclosure of which is hereby incorporated by reference.
  • Figs. 11 - 17 may be employed to provide stereo projection without the need for plural projectors.
  • the information to be presented to the left eye is provided, for example, by light valve array 308 with a vertical polarization and the information to be presented to the right eye is provided, for example, by light valve array 310 with a horizontal polarization.
  • the passive polarized eyeglasses in such a case would have vertical polarization in front of the left eye and horizontal polarization in front of the right eye.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Liquid Crystal (AREA)
  • Projection Apparatus (AREA)

Abstract

Ce projecteur comprend une source de lumière non polarisée (10), un diviseur de faisceau polarisant (12), qui reçoit la lumière de la source de lumière non polarisée, et un modulateur de lumière (16) rotatif à polarisation sélective qui polarise la lumière, reçue dans une direction du diviseur de faisceau polarisant, dans un sens, et qui polarise dans un deuxième sens celle reçue de ce diviseur dans une deuxième direction.
PCT/IL1996/000065 1995-10-13 1996-07-24 Projecteur Ceased WO1997014076A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU65299/96A AU6529996A (en) 1995-10-13 1996-07-24 Projector
JP9514888A JPH11513504A (ja) 1995-10-13 1996-07-24 プロジェクター
EP96925058A EP0880725A4 (fr) 1995-10-13 1996-07-24 Projecteur

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/543,219 1995-10-13
US08/543,219 US5833338A (en) 1995-05-19 1995-10-13 Projector

Publications (1)

Publication Number Publication Date
WO1997014076A1 true WO1997014076A1 (fr) 1997-04-17

Family

ID=24167089

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL1996/000065 Ceased WO1997014076A1 (fr) 1995-10-13 1996-07-24 Projecteur

Country Status (6)

Country Link
EP (1) EP0880725A4 (fr)
JP (1) JPH11513504A (fr)
CN (1) CN1214127A (fr)
AU (1) AU6529996A (fr)
CA (1) CA2234643A1 (fr)
WO (1) WO1997014076A1 (fr)

Cited By (5)

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Publication number Priority date Publication date Assignee Title
WO2000065401A1 (fr) * 1999-04-28 2000-11-02 Intel Corporation Systeme d'affichage par projection soumis a des oscillations mecaniques
EP1003062B1 (fr) * 1998-06-05 2006-11-08 Seiko Epson Corporation Source lumineuse et dispositif d'affichage
CN107861310A (zh) * 2017-11-27 2018-03-30 深圳市华星光电技术有限公司 一种双镜头激光投影显示装置
CN107885022A (zh) * 2017-12-28 2018-04-06 深圳市华星光电技术有限公司 双镜头激光投影仪显示装置及其使用方法
US11550135B2 (en) 2018-04-26 2023-01-10 Carl Zeiss Microscopy Gmbh Optical arrangement and method for light beam shaping for a light microscope

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KR101019378B1 (ko) * 2002-12-04 2011-03-07 톰슨 라이센싱 높은 콘트라스트 입체 프로젝션 시스템
KR101681917B1 (ko) * 2006-09-29 2016-12-02 리얼디 인크. 입체 투사를 위한 편광 변환 시스템들

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US5121983A (en) * 1989-12-14 1992-06-16 Goldstar Co., Ltd. Stereoscopic projector
US5172254A (en) * 1988-12-05 1992-12-15 Sharp Kabushiki Kaisha Projection-type liquid crystal display apparatus
US5181054A (en) * 1990-08-10 1993-01-19 Thomson-Csf Device for the projection of images using two orthogonal components of light polarization
US5235444A (en) * 1988-08-26 1993-08-10 U.S. Philips Corporation Image projection arrangement
US5389982A (en) * 1990-12-26 1995-02-14 Goldstar Co., Ltd. Optical system for liquid crystal projector

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JPH05257110A (ja) * 1992-03-13 1993-10-08 Sharp Corp 投射型液晶表示装置
US5428469A (en) * 1993-11-16 1995-06-27 Minnesota Mining And Manufacturing Company Liquid crystal display projection systems employing polarizing beam splitters and passing light through display cell from both directions

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US5235444A (en) * 1988-08-26 1993-08-10 U.S. Philips Corporation Image projection arrangement
US5172254A (en) * 1988-12-05 1992-12-15 Sharp Kabushiki Kaisha Projection-type liquid crystal display apparatus
US4911547A (en) * 1989-06-07 1990-03-27 Hughes Aircraft Company Compact optical system for a single light valve projector using two axes of polarization
US5121983A (en) * 1989-12-14 1992-06-16 Goldstar Co., Ltd. Stereoscopic projector
US5181054A (en) * 1990-08-10 1993-01-19 Thomson-Csf Device for the projection of images using two orthogonal components of light polarization
US5389982A (en) * 1990-12-26 1995-02-14 Goldstar Co., Ltd. Optical system for liquid crystal projector

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1003062B1 (fr) * 1998-06-05 2006-11-08 Seiko Epson Corporation Source lumineuse et dispositif d'affichage
CN100390599C (zh) * 1998-06-05 2008-05-28 精工爱普生株式会社 光源装置和显示装置
WO2000065401A1 (fr) * 1999-04-28 2000-11-02 Intel Corporation Systeme d'affichage par projection soumis a des oscillations mecaniques
US6317169B1 (en) 1999-04-28 2001-11-13 Intel Corporation Mechanically oscillated projection display
GB2363929A (en) * 1999-04-28 2002-01-09 Intel Corp Mechanically oscillated projection display
GB2363929B (en) * 1999-04-28 2003-10-29 Intel Corp Mechanically oscillated projection display
KR100435266B1 (ko) * 1999-04-28 2004-06-11 인텔 코오퍼레이션 기계적으로 발진되는 투영 디스플레이
DE10084527B4 (de) * 1999-04-28 2006-03-16 Intel Corporation, Santa Clara Mechanisch zur Oszillation gebrachte Projektionsanzeigeeinrichtung
CN107861310A (zh) * 2017-11-27 2018-03-30 深圳市华星光电技术有限公司 一种双镜头激光投影显示装置
CN107885022A (zh) * 2017-12-28 2018-04-06 深圳市华星光电技术有限公司 双镜头激光投影仪显示装置及其使用方法
US11550135B2 (en) 2018-04-26 2023-01-10 Carl Zeiss Microscopy Gmbh Optical arrangement and method for light beam shaping for a light microscope

Also Published As

Publication number Publication date
JPH11513504A (ja) 1999-11-16
AU6529996A (en) 1997-04-30
CN1214127A (zh) 1999-04-14
EP0880725A4 (fr) 2000-01-05
CA2234643A1 (fr) 1997-04-17
EP0880725A1 (fr) 1998-12-02

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