Automatic bias control of an image display device in a video mon

Details Automatic bias control of an image display device in a video mon Automatic bias control of an image display device in a video mon

1986-08-15

1987-09-15

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 29, 358 65, H04N 568, H04N 920

Patent

active

046943501

ABSTRACT:
A data display video monitor includes an automatic kinescope bias (AKB) control system for the type wherein kinescope cathode output pulses representative of the black current level conducted by the kinescope are produced in response to energizing the kinescope grid during sensing intervals. As a result of this operation, plural horizontal lines along the top edge of the visible display screen area are illuminated. To reduce the visible effect of the illuminated lines, the AKB system is activated for short sensing intervals (e.g., two seconds or less) between considerably longer holding intervals (e.g., five minutes).

REFERENCES:
patent: 4130829 (1978-11-01), Kam
patent: 4263622 (1981-04-01), Hinn
patent: 4287405 (1983-06-01), Hinn
patent: 4484228 (1984-11-01), Parker
patent: 4518986 (1985-05-01), Hinn
patent: 4587566 (1986-05-01), Hinn
Information Data Bulletin for CA 3224E Integrated Circuit (File No. 1553) of RCA Corporation.

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