Liquid crystal display device

Details Liquid crystal display device Liquid crystal display device

2006-05-23

2011-11-22

Mengistu, Amare (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

Intensity or color driving control

C345S088000, C345S102000

Reexamination Certificate

active

08063922

ABSTRACT:
A control circuit changes the ratio of an illumination period to a non-illumination period in a frame period of a backlight according to a gradation level in the one frame period of an image displayed on a liquid crystal panel in such a manner that the higher the gradation level, the backlight illumination control circuit increases the ratio of the illumination period to the non-illumination period in the frame period of the backlight, and the lower the gradation level, the backlight illumination control circuit decreases the ratio of the illumination period to the non-illumination period in the frame period of the backlight and thereby controls illumination intensity toward the liquid crystal panel. A time center of illumination intensity in each one frame period of the backlight is controlled in order that the time center exists in a constant temporal position from the beginning of each frame period.

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patent: 2004-163829 (2004-06-01), None
patent: 2005-208425 (2005-04-01), None

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