Dual frequency cholesteric display and drive scheme
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United States of America Patent
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Nov 20, 2001
Grant Date -
N/A
app pub date -
Jan 21, 1999
filing date -
Jan 21, 1999
priority date (Note) -
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Abstract
A dual frequency cholesteric display includes a pair of opposed substrates, wherein one of the substrates has a first plurality of electrodes facing a second plurality of electrodes on the other substrate. A dual frequency bistable cholesteric liquid crystal material is disposed between the substrates, wherein the material and the intersection of the first and second plurality of electrodes forms a plurality of pixels. By selectively applying high and low frequency voltages to the plurality of pixels, the high frequency voltage causes the material to exhibit one texture and the low frequency voltage causes the material to exhibit another texture. By adjusting a voltage amplitude value for each high and low frequency causes each pixel to exhibit a desired reflectance.
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