Video signal analog-to-digital converter for an image display ap

Details Video signal analog-to-digital converter for an image display ap Video signal analog-to-digital converter for an image display ap

1983-03-11

1985-06-11

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358169, H04N 514, H04N 566

Patent

active

045232326

ABSTRACT:
A video signal analog-to-digital converter for an image display device comprises a reference signal generator, which can detect variations of the average level of a video signal and generate a variable upper and a variable lower reference potential in accordance with the variations detected. An analog-to-digital converting circuit A/D converts the video signal between present variable upper and lower reference potentials to produce a digital code signal. Brightness control of an LC display panel is done according to the digital code signal.

REFERENCES:
patent: 4006298 (1977-02-01), Fowler et al.
patent: 4268863 (1981-05-01), Los
patent: 4403253 (1983-09-01), Morris et al.
patent: 4427978 (1984-01-01), Williams

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