Automatic contrast control for liquid crystal displays

Details Automatic contrast control for liquid crystal displays Automatic contrast control for liquid crystal displays

1997-03-10

1998-12-15

Wu, Xiao

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 89, G09G 336

Patent

active

058502050

ABSTRACT:
An LCD with automatic contrast control is provided. A light sensor is mounted over a test pixel which is separate form the main viewing area of the LCD for taking luminance measurements for "ON", "OFF", and "surround" pixel states for a series of candidate operating voltages. The pixel contrast ratio and background contrast ratio are computed for each candidate voltage and the voltage resulting in the best contrast is selected as the operating voltage for the entire LCD.

REFERENCES:
patent: 4888599 (1989-12-01), Harwood
patent: 5029982 (1991-07-01), Nash
patent: 5153756 (1992-10-01), Ike
patent: 5162785 (1992-11-01), Fagard
patent: 5406305 (1995-04-01), Shimomura et al.
patent: 5489918 (1996-02-01), Mosier
patent: 5517212 (1996-05-01), Inoue
patent: 5608422 (1997-03-01), Ikeda

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