Automatic brightness limiting circuit

Details Automatic brightness limiting circuit Automatic brightness limiting circuit

1987-12-23

1990-02-13

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358168, 315411, H04N 318

Patent

active

049011561

ABSTRACT:
An automatic brightness limiting (ABL) circuit is provided for preventing the color dispersion of a displayed picture which is caused by an excessive beam current flowing through a color picture tube. The variation of the beam current is detected at the lower terminal of the serial resistor circuit of the high voltage output stage of a flyback transformer that is included in the high voltage output section. The detected beam current variation is amplified and, in turn, supplied to a color output section as a control voltage through a brightness adjusting section.

REFERENCES:
patent: 3745246 (1973-07-01), Kashiwagi
patent: 3842201 (1974-10-01), Ghaem-Maghami et al.
patent: 3873767 (1975-03-01), Okada et al.
patent: 4218720 (1980-08-01), Kam et al.
patent: 4321513 (1982-03-01), Knight
patent: 4531181 (1985-07-01), Herz et al.

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