Black-current-setting circuit for color CRT

Details Black-current-setting circuit for color CRT Black-current-setting circuit for color CRT

1987-01-29

1988-05-17

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 74, 358243, H04N 972

Patent

active

047454644

ABSTRACT:
To control the operating point of video output stages, and particularly of wide-band video output stages, a voltage corresponding to cathode beam current is applied to a standard video processor (22), for example of the type TDA 3301, which includes at least one sticking voltage or set point or cut-off automatic control circuit, preferably one for each of the respective red, green and blue chromaticity signals (1, 2, 3). The output signal from the sticking voltage or set point or cut-off automatic control circuit, in accordance with a feature of the invention, is superimposed on the video signals applied to the video output circuit. When color display apparatus or monitors are provided, three wide-band video output circuits are provided.

REFERENCES:
patent: 4298886 (1981-11-01), Perkins
patent: 4484228 (1984-11-01), Parker
patent: 4506292 (1985-03-01), Newton et al.
patent: 4562479 (1985-12-01), McDonald
patent: 4675726 (1987-06-01), Leshko
patent: 4679065 (1987-07-01), Umezawa
patent: 4680640 (1987-07-01), Blanken et al.

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