Full spectrum reflective choleterics display employing circular polarizers with the same polarity but different disposition
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United States of America Patent
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Feb 5, 2002
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N/A
app pub date -
Sep 10, 1999
filing date -
Sep 10, 1999
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Expired
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Abstract
This invention is related to a full spectrum reflective or tranmissive black-and-white cholesteric liquid crystal display. The white state is realized by a full gamut of light reflection or transmission in the display's planar texture, and the black state is created by cholesterics' scattering type depolarization effect and polarizer's filtration effect in the display's focal conic texture. It has been discovered that the scattering depolarization effect and multi-filtration process can generate a black dark state, the optical 'off' state in focal conic texture of cholesteric liquid crystals. In the dark-and-white cholesterics display can be easily upgraded to a full color display by means of micro-color filter structure in both front and back illuminating systems.
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