Apparatus for adjusting brightness of a display screen based on

Details Apparatus for adjusting brightness of a display screen based on Apparatus for adjusting brightness of a display screen based on

1992-06-02

1993-11-23

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358242, H04N 557

Patent

active

052649342

ABSTRACT:
A brightness control circuit used in a display apparatus which displays video signals of various horizontal sync frequencies comprises a horizontal frequency detector which detects the horizontal sync frequency of the input video signal and produces a value that is proportional to the detected frequency, a frequency-to-voltage convertor which produces a voltage that is proportional to the value of frequency, and a brightness adjustor which produces a brightness control signal such that the brightness of screen decreases in response to a smaller voltage value provided by the frequency-to-voltage convertor or increases in response to a larger voltage value.

REFERENCES:
patent: 4197557 (1980-04-01), Tuma
patent: 4684987 (1987-08-01), Tsutsui
patent: 4982287 (1991-01-01), Lagoni
patent: 4991023 (1991-02-01), Nicols

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