Smectic liquid crystal devices using SSFLC and electroclinic effect based cells
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United States of America Patent
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Dec 1, 1992
Issued Date -
N/A
app pub date -
Dec 27, 1990
filing date -
Oct 30, 1989
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Expired
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Abstract
Fast switching, high-contrast light valves and light valves which function for multi-level, gray-scale production are provided. Light valves of this invention employ two or more low-tilt, chiral smectic liquid crystal cells which are half-wave plates. Bistable FLC cells or FLC cells having smectic A* materials which display a field dependent tilt angle can be used. The FLC cells of exemplary device configurations are positioned sequentially along a light path through the device with the optic axes of the sequential FLC cells rotating in opposite directions upon application of a driving electric field thereacross. Light valves employing smectic C* and smectic A* liquid crystal cells are provided.
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