R,G,B level control in a liquid crystal TV using average of comp

Details R,G,B level control in a liquid crystal TV using average of comp R,G,B level control in a liquid crystal TV using average of comp

1987-03-09

1988-05-17

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 27, 358 32, 358 59, 358179, 358236, H04N 968

Patent

active

047454610

ABSTRACT:
A circuit is disclosed which, in order to perform a faithful color reproduction, controls the level of a color video signal on a liquid crystal television receiver by uniformly amplifying primary color signals R, G and B in accordance with an average of composite color video signal and, after passing through a clamping circuit to obtain an aligned pedestal level, subjecting them to A/D conversion.

REFERENCES:
patent: 4403253 (1983-09-01), Morris et al.
patent: 4523232 (1985-06-01), Kameda et al.
patent: 4642693 (1987-02-01), Fuse et al.
patent: 4642694 (1987-02-01), Yamagishi et al.

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