Cholesteric liquid crystal display employing circular polarizer and methods of operation and manufacture therefor
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United States of America Patent
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Aug 18, 1998
Grant Date -
N/A
app pub date -
Dec 4, 1996
filing date -
Dec 4, 1996
priority date (Note) -
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Abstract
A cholesteric liquid crystal display ('LCD') and methods of operating and manufacturing the LCD. The LCD includes: (1) a controllable cholesteric liquid crystal (CLC) located between first and second substrates, the controllable CLC selectively exhibiting an 'on' state and an 'off' state and having a circular polarity of a predetermined handedness when the controllable CLC is in the 'on' state and (2) a circular polarizer, located proximate the first substrate and having a circular polarity of a particular handedness, that cooperates with the controllable CLC to increase the difference between the relative brightness of the 'on' state and the 'off' state, whereby a contrast ratio of the cholesteric LCD is increased.
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