Apparatus and method of controlling driving voltage for...

Details Apparatus and method of controlling driving voltage for... Apparatus and method of controlling driving voltage for...

2005-04-12

2005-04-12

Shalwala, Bipin (Department: 2673)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S087000, C345S098000, C353S020000, C349S008000

Reexamination Certificate

active

06879311

ABSTRACT:
Apparatus and method for controlling a driving voltage for an image display device, in which an optical sensor is installed between a liquid crystal display device and a screen or between the liquid crystal display device and a projection lens, and the driving voltage for the liquid crystal display device is feedback controlled using the output signal of the optical sensor in order to provide an optimal contrast. In this apparatus and method, the edge area of an image display device is subject to a minute change in the amplitude of a driving voltage, and the optical change is sensed and used to control the driving voltage of the image display device. Accordingly, regardless of property changes due to the temperature of an image display device and its peripheral devices, a picture can be displayed with an optimal contrast and blinking due to flickering can be minimized.

REFERENCES:
patent: 5283600 (1994-02-01), Imai
patent: 6266102 (2001-07-01), Azuma et al.
patent: 6414667 (2002-07-01), Bonnett et al.
patent: 6738106 (2004-05-01), Tanahara et al.
patent: 2000-289994 (2000-01-01), None
patent: 2001-0001597 (2001-01-01), None

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