Method and device for limiting the current of a cathode-ray tube

Details Method and device for limiting the current of a cathode-ray tube Method and device for limiting the current of a cathode-ray tube

1991-01-04

1992-07-28

Peng, John K.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358168, 358169, 315380, H04N 568, H04N 557

Patent

active

051344920

ABSTRACT:
A limiter device essentially includes a comparator connected to a capacitor charged by a current proportional to the beam current and short-circuited by pulses during one line just after the frame return pulses. This comparator receives a threshold voltage and its output is connected to a capacitor connected to another reference voltage, and this comparator is validated by the frame return pulses.

REFERENCES:
patent: 3735039 (1973-05-01), Trzyna
patent: 3914545 (1975-10-01), Engel
patent: 4253110 (1981-02-01), Harwood et al.
patent: 4298885 (1981-11-01), Okada
patent: 4521811 (1985-06-01), Stoughton et al.
patent: 4553156 (1985-11-01), Douziech
patent: 4561014 (1985-11-01), Douziech
patent: 4644388 (1987-02-01), Douziech
patent: 4996590 (1991-02-01), Okamoto et al.
IBM Technical Disclosure Bulletin, vol. 27, No. 3 Aug. 1984, pp. 1766-1768, N.Y., U.S.; C. J. Ling et al.: "Automatic brightness control for CRT".

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