Television receiver that controls display contrast based on the

Details Television receiver that controls display contrast based on the Television receiver that controls display contrast based on the

1995-08-28

1997-01-21

Peng, John K.

Television

Image signal processing circuitry specific to television

Gray scale transformation

348569, 348678, H04N 722, H04N 714

Patent

active

055963749

ABSTRACT:
A television receiver includes a first signal processing unit that generates contrast controlled first R, G and B signals and a second signal processing unit that outputs second on-screen R, G and B signals. A switching unit receives the first and second R, G and B signals and selectively outputs one of them to a color CRT. An ABL voltage, which changes in response to a level of video displayed on the CRT, is provided to the first and the second R, G and B signals. A control unit determines whether to execute the contrast control of the second R, G and B signals based on a ratio of video corresponding to the second R, G and B signals out of the total video displayed on the color CRT.

REFERENCES:
patent: 4451840 (1984-05-01), Shanley, II
patent: 5345278 (1994-09-01), Choi
patent: 5386247 (1995-01-01), Shafer et al.
patent: 5481318 (1996-01-01), Flowers

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