Drive device for driving a matrix-type LCD apparatus

Details Drive device for driving a matrix-type LCD apparatus Drive device for driving a matrix-type LCD apparatus

1992-09-11

1995-05-09

Brier, Jeffery

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 89, G09G 336

Patent

active

054144434

ABSTRACT:
A drive device for driving a matrix-type LCD apparatus comprises a voltage signal supply means for outputting a plurality of voltage signals with different levels. The voltage signals have alternately positive and negative levels with respect to an AC reference voltage applied to a counter-electrode of the LCD apparatus. The AC reference voltage is approximately 180.degree. out-of-phase with the voltage signals. The drive device also comprises a signal electrode drive means which selects one of the voltage signals depending upon an input digital video signal, and which supplies the selected voltage signal to a signal electrode of the LCD apparatus.

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patent: 4921334 (1990-05-01), Akodes
patent: 4975691 (1990-12-01), Lee
patent: 5061920 (1991-10-01), Nelson

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