Computer graphics processing and selective visual display system – Display driving control circuitry
Patent
1997-11-19
2000-11-21
Mengistu, Amare
Computer graphics processing and selective visual display system
Display driving control circuitry
345 98, 345 52, G09G 500
Patent
active
061510165
ABSTRACT:
An erasing device for a liquid crystal display image of the present invention is furnished with an auxiliary power source for continuously supplying power source to a liquid crystal display panel for a certain period after the main power source of the main body of the liquid crystal display device is turned OFF. Upon input of a power source OFF signal directing to turn OFF the main power source, a driving signal generating circuit and a driver controller light up the liquid crystal display panel entirely on a saturation voltage of the liquid crystal and subsequently shut off the same entirely using the power supply from the auxiliary power source. Consequently, it has become possible to erase an afterimage quickly on an active matrix liquid crystal display panel with a memory maintaining function of a liquid crystal display device, thereby not only upgrading the display quality, but also preventing deterioration of the liquid crystal caused by an application of an abnormal voltage associated with the occurrence of an afterimage.
REFERENCES:
patent: 5248963 (1993-09-01), Yasui et al.
patent: 5313282 (1994-05-01), Hayashi
patent: 5592191 (1997-01-01), Tsuboyama et al.
Itoh Yasuhisa
Kanbe Makoto
Yoneda Hiroshi
Yoshida Shigeto
Mengistu Amare
Nguyen Jimmy Hai
Sharp Kabushiki Kaisha
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