Reflective cholesteric displays employing linear polarizer
First Claim
Patent Images
1. A reflective display comprising:
- a. a linear polarizer, b. a reflective half-wave plate, c. a plurality of transparent conductive patterned substrates juxtaposed to form a cell structure, d. a cholesteric material with a predetermined reflective wavelength and a predetermined thick-to-pitch ratio and with at least one controllable optical ON texture and at least one controllable optical OFF texture respectively, wherein the cell structure enclosing the cholesteric material, attaching the linear polarizer on the front outside surface and the reflective half-wave plate on the back outside surface, whereby a paper white state will be displayed in the controllable optical ON texture area; and
a black state will be displayed in the controllable optical OFF texture area.
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Abstract
The present invention relates to cholesteric displays, and more specifically, to reflective cholesteric displays employing linear polarizer(s). Two display modes have been accomplished and both of them take on black-and-white appearances. The addition of the weak linear polarizer has greatly increased the brightness of the white color while maintaining the black darkness.
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Citations
20 Claims
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1. A reflective display comprising:
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a. a linear polarizer, b. a reflective half-wave plate, c. a plurality of transparent conductive patterned substrates juxtaposed to form a cell structure, d. a cholesteric material with a predetermined reflective wavelength and a predetermined thick-to-pitch ratio and with at least one controllable optical ON texture and at least one controllable optical OFF texture respectively, wherein the cell structure enclosing the cholesteric material, attaching the linear polarizer on the front outside surface and the reflective half-wave plate on the back outside surface, whereby a paper white state will be displayed in the controllable optical ON texture area; and
a black state will be displayed in the controllable optical OFF texture area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A reflective display comprising:
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a. an absorptive linear polarizer b. a reflective linear polarizer with crossed polarity to the absorptive linear polarizer, c. a plurality of transparent conductive patterned substrates juxtaposed to form a cell structure, d. a cholesteric material with a predetermined reflective wavelength and a predetermined thick-to-pitch ratio and with at least one controllable optical ON texture and at least one controllable optical OFF texture respectively, wherein the cell structure enclosing the cholesteric material, attaching the absorptive polarizer on the front outside surface and the reflective linear polarizer on the back outside surface, whereby a paper white state will be displayed in the controllable optical ON texture area; and
a black state will be displayed in the controllable optical OFF texture area. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A reflective display comprising:
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a. an absorptive linear polarizer b. a reflective linear polarizer with in-parallel polarity to the absorptive linear polarizer, c. a plurality of transparent conductive patterned substrates juxtaposed to form a cell structure, d. a cholesteric material with a predetermined reflective wavelength and a predetermined thick to pitch ratio and with at least one controllable optical ON texture and at least one controllable OFF texture respectively, wherein the cell structure enclosing the cholesteric material, attaching the absorptive polarizer on the front outside surface and the reflective linear polarizer on the back outside surface, whereby a paper white state will be displayed in the controllable optical ON texture area due to the guiding effect of the linear polarizers; and
a black state will be displayed in the controllable optical OFF texture area due to the multi-pass absorption effect of the linear polarizers. - View Dependent Claims (17, 18, 19, 20)
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Specification