Automatic brightness limitation for avoiding video signal...

Television – Image signal processing circuitry specific to television – Gray scale transformation

Reexamination Certificate

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Details

C348S645000, C348S684000, C348S692000

Reexamination Certificate

active

07154563

ABSTRACT:
A brightness limitation system is employed in a television circuit to prevent the black reference voltage level and the video signal from entering a minimum signal clipping zone, to provide precise correction signal, limiting the brightness, to maintain a constant black reference voltage level, and maintain a video signal with dynamic amplitude. The brightness limitation circuit detects a minimum signal level amongst the black reference signals from each color channel and compares the minimum signal with a fixed voltage level to generate a brightness feedback signal. The brightness feedback signal is then used to modify the black reference signal level for each color channel.

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