Drive voltage generating circuit having a contrast control funct

Details Drive voltage generating circuit having a contrast control funct Drive voltage generating circuit having a contrast control funct

1994-08-29

1996-03-12

Pascal, Robert J.

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

3151691, 345 76, 345211, G09G 310

Patent

active

054989329

ABSTRACT:
A drive voltage generating circuit outputs drive signals having voltage levels which is controlled by a second control signal is disclosed. A drive voltage generating circuit according to the present invention comprises drive output terminals for outputting drive signals having voltage levels, a bias circuit having a first voltage terminal to be applied to a first voltage and a second voltage terminal to be applied to a second voltage. The bias circuit produces voltage signals having the drive voltage levels. A drive voltage generating circuit according to the present invention further comprises a switching circuit having input terminals coupled to the bias circuit, output terminals coupled to the drive output terminals and a control terminal receiving a first control signal, a bias potential control circuit coupled between the second voltage terminal and a third voltage terminal to be applied to a third voltage. The bias potential control circuit includes a first voltage control circuit controlling a resistance value between the second and third voltage terminals in response to contrast data signals and a second voltage control circuit controlling the resistance value between the second and third voltage terminals in response to a second control signal.

REFERENCES:
patent: 4646079 (1987-02-01), Kitai et al.
patent: 5119097 (1992-06-01), Ohkura et al.
patent: 5336978 (1994-08-01), Alessio

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