Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1997-11-06
1999-08-17
Kostak, Victor R.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
348677, 348691, G09G 336, H04N 5202
Patent
active
059400587
ABSTRACT:
A clamp and gamma correction circuit which processes an image signal through a clamp circuit and then a gamma correction circuit in that order to perform a proper gamma correction with a clamp voltage adjusted to its appropriate value. An image signal varying between a black level and a white level is applied to the clamp circuit. The clamp circuit outputs an image signal, the black level of which is clamped to the clamp voltage, while the amplitude between the black level and the white level is maintained at constant level. The gamma correction circuit amplifies the image signal output by the clamp circuit at different amplification factors based on a reference voltage. A voltage setting circuit varies the clamp voltage and the reference voltage but with the voltage difference therebetween kept constant, and applies the clamp voltage and the reference voltage to the clamp circuit and the gamma correction circuit, respectively.
REFERENCES:
patent: 5751267 (1998-05-01), Sato et al.
patent: 5754150 (1998-05-01), Matsui
Kostak Victor R.
Seiko Epson Corporation
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