Video signal processing circuit for improving contrast for an LC

Details Video signal processing circuit for improving contrast for an LC Video signal processing circuit for improving contrast for an LC

1991-08-05

1993-10-26

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 32, 358172, 358174, H04N 516

Patent

active

052571084

ABSTRACT:
A video signal process circuit which stretches the black level of a signal voltage for a dark picture and the white level of the signal voltage for a bright picture so as to improve visual contrast and reproduce a clear picture even when a light valve with a narrow dynamic range such as a liquid crystal projector is used.

REFERENCES:
patent: 4328514 (1982-05-01), Nakashima et al.
patent: 4369466 (1983-01-01), Matsuzaki et al.
patent: 4745461 (1988-05-01), Shirai et al.
patent: 4811101 (1989-03-01), Yagi
patent: 5003394 (1991-03-01), Lagoni
patent: 5089890 (1992-02-01), Takayama

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