Paper white cholesteric displays employing reflective elliptical polarizer
First Claim
1. A reflective paper white display comprising:
- a. an absorptive elliptical polarizer, and b. a reflective elliptical polarizer with a polarity the same as the absorptive elliptical polarizer, and c. a darkening layer, and d. a plurality of transparent conductive patterned substrates juxtaposed to form a cell structure, and e. a cholesterics material with predetermined polarity and with at least one controllable optical ON texture and at least one controllable OFF texture respectively, and f. the cell structure enclosing the cholesteric material within inside surfaces, attaching the absorptive elliptical polarizer on the front outside surface and the reflective elliptical polarizer on the back outside surface, and combining the darkening layer at the utmost back side of the structure, whereby a paper white ON state will be displayed in the controllable optical ON texture area of the cholesterics;
whereby a black OFF state will be displayed in the controllable optical OFF texture area of the cholesterics.
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Abstract
This invention relates to paper white cholesteric displays employing a reflective elliptical polarizer. In the reflective mode, the paper white ON state is achieved by a reflective elliptical polarizer in display'"'"'s planar texture area; and the black OFF state is obtained by cholesteric'"'"'s depolarization effect and polarizer'"'"'s filtration effect in display'"'"'s focal conic texture area. In the transmissive mode, on the other hand, the paper white ON state is created by a back lighting projected onto the focal conic texture area; and the black OFF state is realized in the cholesteric planar texture area. The reflective elliptical polarizer with a broadband reflection and high polarization efficiency delivers a bright neutral white color to both the reflective and transmissive mode cholesteric displays. The reflective elliptical polarizer also provides a solution to the transflective display where the high efficiency front-lit mode and the back-lit mode can be converted automatically.
18 Citations
20 Claims
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1. A reflective paper white display comprising:
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a. an absorptive elliptical polarizer, and b. a reflective elliptical polarizer with a polarity the same as the absorptive elliptical polarizer, and c. a darkening layer, and d. a plurality of transparent conductive patterned substrates juxtaposed to form a cell structure, and e. a cholesterics material with predetermined polarity and with at least one controllable optical ON texture and at least one controllable OFF texture respectively, and f. the cell structure enclosing the cholesteric material within inside surfaces, attaching the absorptive elliptical polarizer on the front outside surface and the reflective elliptical polarizer on the back outside surface, and combining the darkening layer at the utmost back side of the structure, whereby a paper white ON state will be displayed in the controllable optical ON texture area of the cholesterics;
whereby a black OFF state will be displayed in the controllable optical OFF texture area of the cholesterics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A transmissive paper white display comprising:
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a. an absorptive elliptical polarizer b. a transmissive non-absorptive elliptical polarizer with opposite polarity to the absorptive elliptical polarizer, c. a back lighting system, d. a plurality of transparent conductive patterned substrates juxtaposed to form a cell structure, and e. a cholesterics material with predetermined polarity and with at least one controllable optical ON texture and at least one controllable OFF texture respectively, and f. the cell structure enclosing the cholesteric material within inside surfaces, attaching the absorptive elliptical polarizer on the front outside surface and the transmissive non-absorptive elliptical polarizer on the back outside surface, and combining the back lighting system at the utmost back side of the structure, whereby a paper white ON state will be displayed in the controllable optical ON texture area of the cholesterics;
whereby a black OFF state will be displayed in the controllable optical OFF texture area of the cholesterics. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A transflective display comprising:
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a. an absorptive elliptical polarizer, and b. a reflective elliptical polarizer with a dual polarity to the absorptive elliptical polarizer depending on front-lit mode or back-lit mode, c. a back lighting system, d. a plurality of transparent conductive patterned substrates juxtaposed to form a cell structure, and e. a front-lit/back-lit inverting system connected to the conductive patterning substrates, and f. a cholesterics material with predetermined polarity and with at least one controllable optical ON texture and at least one controllable OFF texture respectively, and g. the cell structure enclosing the cholesteric material within inside surfaces, attaching the absorptive elliptical polarizer on the front outside surface and the reflective elliptical polarizer on the back outside surface, and combining the back lighting system at the utmost back side of the structure, whereby a paper white black-and-white front-lit mode and black-and-white back-lit mode will be displayed in the same display panel in a controllable manner. - View Dependent Claims (18, 19, 20)
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Specification