WO2005015894A3 - Method and apparatus for increasing effective contrast ratio and brightness yields for digital light valve image projectors - Google Patents

Method and apparatus for increasing effective contrast ratio and brightness yields for digital light valve image projectors Download PDF

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Publication number
WO2005015894A3
WO2005015894A3 PCT/US2004/025488 US2004025488W WO2005015894A3 WO 2005015894 A3 WO2005015894 A3 WO 2005015894A3 US 2004025488 W US2004025488 W US 2004025488W WO 2005015894 A3 WO2005015894 A3 WO 2005015894A3
Authority
WO
WIPO (PCT)
Prior art keywords
luminance control
contrast ratio
light valve
digital light
image projectors
Prior art date
Application number
PCT/US2004/025488
Other languages
French (fr)
Other versions
WO2005015894A2 (en
Inventor
Eddie E Allen
Thomas D Strade
Christopher Coley
Original Assignee
Eclipse Video Technology Llc
Eddie E Allen
Thomas D Strade
Christopher Coley
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34138764&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2005015894(A3) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Eclipse Video Technology Llc, Eddie E Allen, Thomas D Strade, Christopher Coley filed Critical Eclipse Video Technology Llc
Publication of WO2005015894A2 publication Critical patent/WO2005015894A2/en
Publication of WO2005015894A3 publication Critical patent/WO2005015894A3/en

Links

Classifications

    • 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
    • H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
    • 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]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
    • 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
    • G03B21/20—Lamp housings
    • G03B21/2053—Intensity control of illuminating light
    • 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
    • H04N9/3155—Modulator illumination systems for controlling the light source
    • 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]
    • H04N9/3197—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using light modulating optical valves

Abstract

The present invention is a method and apparatus for increasing the effective contrast ratio and brightness yields for digital light valve image projectors using a variable luminance control mechanism (VLCM), associated with the projector optics, for modifying the light output and provide a correction thereto; and an adaptive luminance control module (ALCM) for receiving signals from said video input board, said adaptive luminance control module producing a signal on a VLCM bus connecting the variable luminance control mechanism and the adaptive luminance control module, said signal causing the variable luminance control mechanism to change the luminance of the light output and provide a corrected video signal for the projector.
PCT/US2004/025488 2003-08-08 2004-08-06 Method and apparatus for increasing effective contrast ratio and brightness yields for digital light valve image projectors WO2005015894A2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US49373903P 2003-08-08 2003-08-08
US60/493,739 2003-08-08
US60/557,620 2004-03-29
US57762004P 2004-06-07 2004-06-07

Publications (2)

Publication Number Publication Date
WO2005015894A2 WO2005015894A2 (en) 2005-02-17
WO2005015894A3 true WO2005015894A3 (en) 2005-10-20

Family

ID=34138764

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/025488 WO2005015894A2 (en) 2003-08-08 2004-08-06 Method and apparatus for increasing effective contrast ratio and brightness yields for digital light valve image projectors

Country Status (2)

Country Link
US (5) US7220006B2 (en)
WO (1) WO2005015894A2 (en)

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Also Published As

Publication number Publication date
WO2005015894A2 (en) 2005-02-17
US20130314615A1 (en) 2013-11-28
US20050052621A1 (en) 2005-03-10
US20090303397A1 (en) 2009-12-10
US20070285627A1 (en) 2007-12-13
US7220006B2 (en) 2007-05-22
US7575330B2 (en) 2009-08-18
US8860891B2 (en) 2014-10-14
US8520149B2 (en) 2013-08-27
US9300900B2 (en) 2016-03-29
US20140285726A1 (en) 2014-09-25

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