PROTECTION OF A CHOLESTERIC LIQUID CRYSTAL DISPLAY DEVICE
First Claim
1. A cholesteric liquid crystal display device, comprising:
- at least one cell comprising two substrates containing therebetween a layer of cholesteric liquid crystal material; and
a protective sheet or a stack of plural protective sheets, being adhered to the substrate at the front of the at least one cell by a layer of adhesive and, in the case of a stack of plural protective sheets, being adhered to each other by a layer of adhesive between each pair of adjacent protective sheets in the stack,whereinthe adhesive is or an adhesive curable by light having a wavelength of at least 390 nm, andthe adhesive contains a UV blocking agent having a property of reducing the transmission of ultra-violet light through the adhesive.
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Accused Products
Abstract
A cholesteric liquid crystal display device (24) has a protective sheet (40) or a stack of protective sheets adhered to the substrate (11) at the front of a stack of cells (10B, 10G, 10R) containing cholesteric liquid crystal material (19). The protective sheet is adhered by a layer of adhesive (40) which is either an adhesive curable by heat or an adhesive curable by light. The adhesive contains a UV blocking agent, for example, a compound based on benzophenone, having a property of reducing the transmission of ultra-violet light through the adhesive. The protective sheet (s) provides protection to the display device and may be made of glass or plastic. Adhering the protective sheet (s) with an adhesive provides the advantages of being much cheaper to implement than laminated glass and of allowing the adhesive to contain the UV blocking agent for UV protection of the cholesteric liquid crystal material.
13 Citations
19 Claims
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1. A cholesteric liquid crystal display device, comprising:
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at least one cell comprising two substrates containing therebetween a layer of cholesteric liquid crystal material; and a protective sheet or a stack of plural protective sheets, being adhered to the substrate at the front of the at least one cell by a layer of adhesive and, in the case of a stack of plural protective sheets, being adhered to each other by a layer of adhesive between each pair of adjacent protective sheets in the stack, wherein the adhesive is or an adhesive curable by light having a wavelength of at least 390 nm, and the adhesive contains a UV blocking agent having a property of reducing the transmission of ultra-violet light through the adhesive. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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4. (canceled)
Specification