Automatic brightness control circuit

Details Automatic brightness control circuit Automatic brightness control circuit

1974-03-01

1976-09-14

Martin, John C.

Telegraphy

Systems

Simplex-reversing periodic

178DIG29, 315383, H04N 568, H01J 2952

Patent

active

039808220

ABSTRACT:
A multiple automatic brightness control for a television receiver including a first automatic brightness limiter (ABL) circuit responsive only to relatively long duration changes in brightness-producing current and a second ABL circuit responsive to brightness-producing current changes of shorter duration than the first ABL circuit. Both ABL circuits have threshold levels below which they are not responsive to brightness-producing current changes, but the threshold level of the second ABL circuit is higher than that of the first so that, while the second ABL circuit responds more quickly than the first, it does so only for higher amplitude changes in the brightness-producing current.

REFERENCES:
patent: 3465095 (1969-09-01), Hansen et al.
patent: 3619705 (1971-11-01), Waybright
patent: 3674932 (1972-07-01), Griepentrog
patent: 3804981 (1974-04-01), Avins
patent: 3848945 (1974-11-01), Holzrichter

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