Automatic contrast control for liquid crystal displays
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United States of America Patent
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-
Dec 15, 1998
Grant Date -
N/A
app pub date -
Mar 10, 1997
filing date -
Mar 10, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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