Reflective cholesteric displays employing circular polarizers with the polarity of the front polarizer opposite to both the back polarizer and the bragg reflection
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United States of America Patent
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Jul 21, 2009
Grant Date -
Jan 24, 2008
app pub date -
Jun 10, 2005
filing date -
Jun 10, 2005
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Abstract
This invention relates to a high brightness and high contrast ratio reflective cholesteric displays employing circular polarizers. The front circular polarizer has a predetermined polarity that is opposite both to the Bragg reflection of the display and to the back reflective circular polarizer. An absorptive weak polarizer with high transmittance is adopted in the display system. In the black-and-white display mode, the white state is achieved in the cholesteric focal conic texture area; and the black state is obtained in the cholesteric planar texture area. In the full color mode, the full color state is created by the micro-color filter in the cholesteric focal conic texture area; and the black state is realized in the cholesteric planar texture area.
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