Television picture image processing apparatus

Details Television picture image processing apparatus Television picture image processing apparatus

1996-10-04

1999-05-18

Flynn, Nathan J.

Television

Image signal processing circuitry specific to television

Brightness control

348806, 348807, 348745, 348688, H04N3/22;3/26;9/28

Patent

active

059055413

ABSTRACT:
A television picture image processing apparatus includes a horizontal edge gate pulse generator, a vertical edge gate pulse generator, an AND combiner for ANDing horizontal and vertical edge gate pulses applied thereto respectively from the horizontal and the vertical edge gate pulse generators, a sawtooth pulse generator, an amplifier for controlling the gain of sawtooth pulses from the sawtooth pulse generator in accordance with an external DC voltage, and a luminance processor. The apparatus prevents picture quality of a television set from being degraded due to a poor contrast and brightness occurring in each corner of a television picture screen.

REFERENCES:
patent: 4425576 (1984-01-01), Hosoya
patent: 4628362 (1986-12-01), Waehner
patent: 4864400 (1989-09-01), Kumada et al.
patent: 4868668 (1989-09-01), Tavernetti
patent: 4982287 (1991-01-01), Layoni
patent: 5146142 (1992-09-01), Van Toi
patent: 5592240 (1997-01-01), Sakamoto et al.

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