Video signal processor for a color liquid crystal display

Details Video signal processor for a color liquid crystal display Video signal processor for a color liquid crystal display

1990-03-15

1991-06-04

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358171, 358172, 358236, 340784, H04N 514

Patent

active

050218867

ABSTRACT:
A video signal processor for processing a composite video signal to be fed to color liquid crystal (LC) panels of a color liquid crystal display which are each assigned to a different color. The pedestal level of each color signal included in the video signal and to be fed to particular one of the LC panels is caused into coincidence with the level of an input signal which reduces the transmittance of the LC panel to the lowest transmittance. The pedestal level is caused to agree with the clipping level of either one of a dark and a white clipping circuit, whereby signal components lower than the pedestal level are removed. The processor insures the maximum contrast available with LC panels and eliminates light-and-dark inversion, thereby enhancing the reproduction of high quality pictures.

REFERENCES:
patent: 2999127 (1961-09-01), Fisher
patent: 3560645 (1971-02-01), Wallace
patent: 3980815 (1976-09-01), Kaneko
patent: 4617590 (1986-10-01), Dann

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