Video display control circuitry

Details Video display control circuitry Video display control circuitry

1980-06-18

1983-05-03

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

315367, 315383, 340767, 340793, G09G 114

Patent

active

043822541

ABSTRACT:
A multilevel video display control circuit. A plurality of current levels are developed in response to coded command signals (P1, P2, P3). The generated currents are summed together and converted to analog voltage signals (V25) to control the brightness of the pixels on the display. A contrast adjustment network (26) includes a first potentiometer (K1) for setting the magnitude of one of the currents at a desired level. A second potentiometer (K2) is provided for varying the magnitudes of the other current levels while maintaining the first current at the preset magnitude. Preferably, the magnitude of the first current is inversely varied with respect to other current levels.

REFERENCES:
patent: 3527980 (1970-09-01), Robichand et al.
patent: 4086579 (1978-04-01), Easter
patent: 4177409 (1979-12-01), Chamberlin
patent: 4251755 (1981-02-01), Bryden
patent: 4274094 (1981-06-01), Noguchi

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