CA2290686A1 - Contrast improvement in liquid crystal light valve projectors - Google Patents

Contrast improvement in liquid crystal light valve projectors Download PDF

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Publication number
CA2290686A1
CA2290686A1 CA002290686A CA2290686A CA2290686A1 CA 2290686 A1 CA2290686 A1 CA 2290686A1 CA 002290686 A CA002290686 A CA 002290686A CA 2290686 A CA2290686 A CA 2290686A CA 2290686 A1 CA2290686 A1 CA 2290686A1
Authority
CA
Canada
Prior art keywords
lcd
light valve
polariser
analyser
alpha
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.)
Granted
Application number
CA002290686A
Other languages
French (fr)
Other versions
CA2290686C (en
Inventor
Bart Maximus
Patrick Candry
Bart Van Den Bossche
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.)
Barco NV
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2290686A1 publication Critical patent/CA2290686A1/en
Application granted granted Critical
Publication of CA2290686C publication Critical patent/CA2290686C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor

Abstract

The present invention relates to a light valve image projector with a disposition for improving the contrast of an optical image projected on a screen by that projector. The projector comprises at least one illumination system, at least one field lens, at least one set consisting of a polariser, an LCD and an analyser and at least a projection lens, and presents at least one optical axis which includes an angle .alpha. with the optical axis of the projection lenses. The invention consists in positioning the analyser (25) so that it includes an angle larger than .alpha. with the LCD, at least for the light rays that pass through the contrast limiting area of the LCD. The invention consists furthermore in placing the polariser so that it includes an angle larger than .alpha. with the LCD. Both the analyser and/or the polariser may have a flat or a curved surface.
CA002290686A 1997-05-20 1998-05-20 Contrast improvement in liquid crystal light valve projectors Expired - Fee Related CA2290686C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP97870070.6 1997-05-20
EP97870070A EP0880279B1 (en) 1997-05-20 1997-05-20 Contrast improvement in liquid crystal light valve projectors
PCT/BE1998/000073 WO1998053608A1 (en) 1997-05-20 1998-05-20 Contrast improvement in liquid crystal light valve projectors

Publications (2)

Publication Number Publication Date
CA2290686A1 true CA2290686A1 (en) 1998-11-26
CA2290686C CA2290686C (en) 2003-12-23

Family

ID=8231001

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002290686A Expired - Fee Related CA2290686C (en) 1997-05-20 1998-05-20 Contrast improvement in liquid crystal light valve projectors

Country Status (9)

Country Link
US (1) US6224215B1 (en)
EP (1) EP0880279B1 (en)
JP (1) JP2001526801A (en)
AT (1) ATE203867T1 (en)
AU (1) AU7419298A (en)
CA (1) CA2290686C (en)
DE (1) DE69705932T2 (en)
NO (1) NO316578B1 (en)
WO (1) WO1998053608A1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4493113B2 (en) * 1999-01-29 2010-06-30 株式会社リコー Projector and projection image correction apparatus
EP1180711A4 (en) * 2000-01-28 2005-10-12 Seiko Epson Corp Optical reflection polarizer and projector comprising the same
US6669343B2 (en) 2001-05-31 2003-12-30 Koninklijke Philips Electronics N.V. Image display system
CA2620657C (en) * 2004-08-26 2011-09-13 Edison Nation Product Company 4, Llc Image projector display device
US7204599B2 (en) * 2004-12-16 2007-04-17 Hewlett-Packard Development Company, L.P. Offset projection system
US20060181552A1 (en) * 2005-02-11 2006-08-17 Siemens Medical Solutions Usa, Inc. Image display calibration for ultrasound and other systems
US20080122996A1 (en) * 2006-11-29 2008-05-29 Nano Loa, Inc. Off-axis projection system
JP4441891B2 (en) * 2007-03-22 2010-03-31 カシオ計算機株式会社 Projection device
JP6170554B2 (en) * 2012-07-01 2017-07-26 バルコ・ナムローゼ・フエンノートシャップ Projector optics
CN110933266B (en) * 2019-07-15 2021-12-21 华为技术有限公司 Image pickup apparatus, method and adjustment element

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5220363A (en) * 1988-09-14 1993-06-15 Casio Computer Co., Ltd. Projector
JPH037110A (en) 1989-06-02 1991-01-14 Yamaha Corp Bed with head board
DE69030537T2 (en) * 1989-07-20 1997-12-04 Sanyo Electric Co Liquid crystal projector
JP2755708B2 (en) * 1989-08-11 1998-05-25 三洋電機株式会社 LCD projector
US5422691A (en) * 1991-03-15 1995-06-06 Seiko Epson Corporation Projection type displaying apparatus and illumination system
JP2861547B2 (en) * 1991-11-15 1999-02-24 松下電器産業株式会社 Projection display device
FR2693020B1 (en) 1992-06-26 1999-01-22 Thomson Consumer Electronics NEMATIC LIQUID CRYSTAL DISPLAY DEVICE.
JP3320862B2 (en) * 1992-11-26 2002-09-03 旭光学工業株式会社 Pupil conjugate coupling device for projection optical system
US5355188A (en) * 1993-09-09 1994-10-11 In Focus Systems, Inc. Method and apparatus for distortion correction in optical projectors
US5576854A (en) 1993-11-12 1996-11-19 Hughes-Jvc Technology Corporation Liquid crystal light valve projector with improved contrast ratio and with 0.27 wavelength compensation for birefringence in the liquid crystal light valve
JPH07234401A (en) * 1994-02-24 1995-09-05 Fujitsu Ltd Projection type liquid crystal display
US5820240A (en) * 1995-06-22 1998-10-13 Minolta Co., Ltd. Projection optical device
JP3138189B2 (en) * 1995-07-28 2001-02-26 シャープ株式会社 Projection type liquid crystal display
US5622417A (en) * 1995-11-01 1997-04-22 Lightware, Inc. Invertible and orthoscopic liquid crystal display projector

Also Published As

Publication number Publication date
DE69705932T2 (en) 2002-04-18
NO995597D0 (en) 1999-11-15
JP2001526801A (en) 2001-12-18
AU7419298A (en) 1998-12-11
EP0880279B1 (en) 2001-08-01
ATE203867T1 (en) 2001-08-15
US6224215B1 (en) 2001-05-01
NO316578B1 (en) 2004-02-23
NO995597L (en) 1999-11-15
WO1998053608A1 (en) 1998-11-26
DE69705932D1 (en) 2001-09-06
EP0880279A1 (en) 1998-11-25
CA2290686C (en) 2003-12-23

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MKLA Lapsed