Gray voltage generation circuit for driving a liquid crystal...

Details Gray voltage generation circuit for driving a liquid crystal... Gray voltage generation circuit for driving a liquid crystal...

2006-10-31

2006-10-31

Lao, Lun-yi (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S092000, C345S096000, C345S099000

Reexamination Certificate

active

07129921

ABSTRACT:
A gray voltage generation circuit for driving a liquid crystal display rapidly outputs an altered gray voltage so that a source driving circuit can charge liquid crystal capacitors constructed in a liquid crystal panel in a short period of time. In response to the gray voltages from the gray voltage generation circuit, while driving a positive polarity, the source driving circuit generates a liquid crystal driving voltage of higher level than the existing liquid crystal driving voltage when applying a gate clock signal of high level, and generates a liquid crystal driving voltage of a level similar to the existing liquid crystal driving voltage when applying a gate clock signal of low level. And, while driving a negative polarity, the source driving circuit generates a liquid crystal driving voltage of lower level than an existing liquid crystal driving voltage when applying a gate clock signal of high level, and generates a liquid crystal driving voltage of a level similar to the existing liquid crystal driving voltage when applying a gate clock signal of low level.

REFERENCES:
patent: 5945970 (1999-08-01), Moon et al.
patent: 6118421 (2000-09-01), Kawaguchi et al.
patent: 6310592 (2001-10-01), Moon et al.
patent: 6556180 (2003-04-01), Furuhashi et al.
patent: 6567062 (2003-05-01), Kudo et al.
patent: 6844867 (2005-01-01), Yamada

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