Method of and apparatus for controlling contrast of liquid crystal displays while receiving large dynamic range video
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United States of America Patent
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Jul 2, 2002
Grant Date -
N/A
app pub date -
Nov 13, 1997
filing date -
Nov 13, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus and method for controlling contrast for a liquid crystal display ('LCD'), especially active-matrix LCDs, while receiving large dynamic range video data to be displayed to the user by the LCD. Contrast settings of the LCD correspond to a single look-up table from a set of different and multiple look-up tables rather than using the contrast setting of the LCD to select different voltage values from a single look-up table. The values of the reference voltages of the LCD are varied so that all shades of gray are available with each contrast selection resulting in a high image quality and a high contrast.
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