Video driver circuit and method for automatic gray scale adjustm

Details Video driver circuit and method for automatic gray scale adjustm Video driver circuit and method for automatic gray scale adjustm

1984-10-03

1985-03-19

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 10, 358166, 358168, 358169, 358171, H04N 514, H04N 516, H04N 5197, H04N 9535

Patent

active

045062927

ABSTRACT:
An apparatus and method for the automatic setup of a CRT operating point, or dc signal level (black), as well as the contrast, or gain level (gray), of a video display by sampling the CRT signal level of the individual cathodes and locking the dc signal level to a common dc setup reference and gain level to a value determined by a common contrast control signal and gain reference. An apparatus and method in which a common brightness control signal is modulated by a common contrast control signal such that a brightness control pedestal is added to each video signal path of a video display whereby picture black level does not change with contrast.

REFERENCES:
patent: 3804981 (1974-04-01), Avins
patent: 3953883 (1976-04-01), Grewe
patent: 3955116 (1976-05-01), Van den Berg
patent: 4053927 (1977-10-01), Schmidtmann
patent: 4204229 (1980-05-01), Heuze
patent: 4234892 (1980-11-01), Mochizuki
patent: 4298886 (1981-11-01), Perkins
patent: 4340904 (1982-07-01), Wingrove, Jr.

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