Video amplifier with foreground and background controls

Details Video amplifier with foreground and background controls Video amplifier with foreground and background controls

1984-09-13

1987-03-17

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358168, 358169, H01J 2952

Patent

active

046510648

ABSTRACT:
A video display terminal is provided with controls which permit independent adjustment of the background information and the foreground information. Each control comprises an adjustable constant current source connected to one of two branches of a differential amplifier. One branch of the differential amplifier is employed to control the background intensity and the other branch of the differential amplifier is employed to control the foreground intensity.

REFERENCES:
patent: 3946275 (1976-03-01), Marino
patent: 4086579 (1978-04-01), Easter

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