Reflective and transflective liquid crystal display using a wire grid polarizer
First Claim
1. A device for single cell gap reflective and transflective liquid crystal displays comprising:
- (a) a single cell gap liquid crystal display (LCD) having reflective pixels and transmissive pixels;
(b) a wire grid polarizer (WGP) solely covering the reflective pixels;
(c) ambient light means reflecting off the reflective pixels; and
,(d) means allowing back light passing through the transmissive pixels,whereby the cell gap LCD achieves high contrast ratios without using phase retardation films.
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Abstract
A device structure for single cell gap reflective and transflective liquid crystal displays (TF-LCDs). For an entirely reflective LCD, the imbedded wire-grid polarizer (WGP) serves as a polarization-dependent for the ambient light. For a transflective TF-LCD, the WGP only covers the reflective pixels. The disclosure also includes a method of using single cell gap liquid crystal displays (LCDs) without phase retardation films by providing a single cell gap LCD having reflective pixels and transmissive pixels, covering solely the reflective pixels, with at least one of: a wire grid polarizer and a broadband cholesteric reflector (BCR), reflecting ambient light off the reflective pixels; and passing back light through the transmissive pixels whereby the cell gap LCD obtains high contrast ratios without using phase retardation films.
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Citations
15 Claims
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1. A device for single cell gap reflective and transflective liquid crystal displays comprising:
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(a) a single cell gap liquid crystal display (LCD) having reflective pixels and transmissive pixels; (b) a wire grid polarizer (WGP) solely covering the reflective pixels; (c) ambient light means reflecting off the reflective pixels; and
,(d) means allowing back light passing through the transmissive pixels, whereby the cell gap LCD achieves high contrast ratios without using phase retardation films. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device for single cell gap reflective and transflective liquid crystal displays, comprising:
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(a) a single cell gap liquid crystal display (LCD) having reflective pixels and transmissive pixels; (b) a broadband cholesteric reflector (BCR) solely covering the reflective pixels; (c) means for reflecting the ambient light off the reflective pixels; and
,(d) means for passing back light through the transmissive pixels whereby the single cell gap LCD achieves high contrast ratios without using phase retardation films.
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12. A method of using single cell gap liquid crystal displays (LCDs) without phase retardation films, comprising the steps of:
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(a) providing a single cell gap LCD having reflective pixels and transmissive pixels; (b) covering solely the reflective pixels with at least one of;
a wire grid polarizer (WGP) and a broadband cholesteric reflector (BCR);(c) reflecting ambient light off the reflective pixels; and
,(d) passing back light through the transmissive pixels whereby the cell gap LCD obtains high contrast ratios without using phase retardation films. - View Dependent Claims (13, 14, 15)
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Specification