Reference voltage generating circuit and liquid display...

Details Reference voltage generating circuit and liquid display... Reference voltage generating circuit and liquid display...

2006-12-22

2010-06-29

Awad, Amr (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S094000

Reexamination Certificate

active

07746302

ABSTRACT:
A reference voltage generating circuit for an LCD device includes a main pumping section, a sub-pumping section, an input section inputting a level designating signal periodically and alternately designating a first reference level and a second reference level, and a control section alternately comparing an output voltage with the first and second reference levels in response to the level designating signal, wherein the control section outputs a first logic level and the main pumping section selectively lowers the output voltage in a fast negative pumping and the sub-pumping section selectively raises the output voltage in a slower positive pumping.

REFERENCES:
patent: 2002/0063703 (2002-05-01), Furuhashi et al.
patent: 2003/0006979 (2003-01-01), Tsuchi et al.

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