Cathode ray tube digital brightness control circuit

Details Cathode ray tube digital brightness control circuit Cathode ray tube digital brightness control circuit

1981-08-27

1985-07-02

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

315383, H04N 558, H01J 2952

Patent

active

045271976

ABSTRACT:
In order to vary the brightness of the display produced by a cathode ray tube, a digital brightness control circuit is provided that utilizes a source of cathode control voltage connected to the cathode of the cathode ray tube, a brightness selector circuit which is connected to a digital counter, and a resistance network connected to the counter and the cathode control voltage source which is effective to vary in discrete increments the brightness of the cathode ray tube.

REFERENCES:
patent: 2731631 (1956-01-01), Spaulding
patent: 3542944 (1970-11-01), Peffer
patent: 4044375 (1977-08-01), Norman
patent: 4177409 (1979-12-01), Chamberlin, Jr.
patent: 4251755 (1981-02-01), Bryden
patent: 4394689 (1983-07-01), Wallace

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