Liquid crystal driving circuit for driving a liquid crystal disp

Details Liquid crystal driving circuit for driving a liquid crystal disp Liquid crystal driving circuit for driving a liquid crystal disp

1998-01-13

2000-01-11

Hjerpe, Richard A.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345100, 345147, G09G 336, G09G 510

Patent

active

060141220

ABSTRACT:
A liquid crystal driving circuit including a switched capacitor circuit 15 having a pair of operational amplifiers AMP1 and AMP2 having different reference voltages, and an output selection circuit 16 for switch-controlling the respective outputs of the operational amplifiers AMP1 and AMP2 to output at a pair of output terminals. Positive and negative output voltages which are in positive and negative amplitude relationship with each other with a half of the liquid crystal driving voltage or the voltage of the common electrode of the liquid crystal display device as a reference voltage are alternately output from the pair of output terminals of the output selection circuit 16 to the common electrode of the liquid crystal display device, thereby performing an alternating current driving operation of the liquid crystal display device in accordance with video data.

REFERENCES:
patent: 5061920 (1991-10-01), Nelson
patent: 5343221 (1994-08-01), Arkawa et al.
patent: 5528296 (1996-06-01), Erhart et al.
patent: 5680149 (1997-10-01), Koyama et al.
patent: 5796379 (1998-08-01), Enomoto et al.

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