Bistable device for reflection display with inverse contrast
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United States of America Patent
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Sep 21, 2004
Grant Date -
Jul 10, 2003
app pub date -
Nov 8, 2002
filing date -
May 12, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention concerns a bistable device comprising a liquid crystal material, aligning means, which orient the liquid crystal to provide two stable or metastable textures, means for applying electric signals enabling to switch between the two textures, a polarizer (10) associated with the front surface of the device, placed inside or outside same, a reflective, specular or diffusing element, placed on the rear surface of the liquid crystal, inside or outside the device, allowing light to pass through the device twice and to return towards the observer or towards additional optical elements, and a compensator (20), placed between the polarizer and the reflective element, with an optical retardation d.sub.c.DELTA.n.sub.c close to .lambda..sub.0 /4.
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