Liquid crystal display device with automatic constrast control
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United States of America Patent
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-
Oct 6, 1992
Grant Date -
N/A
app pub date -
May 3, 1991
filing date -
May 18, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A liquid crystal display apparatus detects and regulates its display contrast. A liquid crystal display unit is provided therein with a pair of liquid crystal cells for use in detection of the display contrast. Incident light is detected through the cells, and the detected results are fed back to control a drive voltage applied to the liquid crystal display unit so as to automatically regulate the display contrast at optimum level.
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