REDUCTION OF CONTOURING IN LIQUID CRYSTAL ON SILICON DISPLAYS BY DITHERING

Title:

REDUCTION OF CONTOURING IN LIQUID CRYSTAL ON SILICON DISPLAYS BY DITHERING

Document Type and Number:

WIPO Patent Application WO2002051122

Kind Code:

A3

Abstract:

A method (30) of reducing contouring in a liquid crystal on silicon (LCOS) display can include receiving a frame-doubled input signal (32) comprising a positive picture and a negative picture. A first dither (36) specified by a gamma table can be applied to the input signal. The first dither can selectively modify a primary-color gamma value of the negative picture or the positive picture. Also, a second dither (34) can be applied to the input signal at an input of the gamma table. The first and second dither can result in an output signal having reduced brightness level repetition for consecutive input levels.

Inventors:

WILLIS DONALD HENRY (US)

Application Number:

PCT/US2001/048787

Publication Date:

February 20, 2003

Filing Date:

December 18, 2001

Export Citation:

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Assignee:

THOMSON LICENSING SA (FR)
WILLIS DONALD HENRY (US)

International Classes:

G09G3/36; G09G3/20; G09G5/02; G09G5/10; H03M1/20; H04N1/00; H04N5/21; H04N5/74; H04N7/015; H04N11/24; H04N; (IPC1-7): G09G5/10

Foreign References:

US5712657A	1998-01-27
US5553200A	1996-09-03

Other References: