Liquid crystal element having composite layer

Details Liquid crystal element having composite layer Liquid crystal element having composite layer

1995-11-08

2000-01-18

Wu, Shean C

Compositions

Liquid crystal compositions

25229966, 349 88, 349175, 349184, 349185, 349186, C09K 1952, G02F 1137, G02F 11333

Patent

active

060155078

ABSTRACT:
A liquid crystal element includes a pair of plates at least one of which is transparent, and a composite layer retained between the plates and including a liquid crystal material in a transparent resin substrate. In the liquid crystal element, (A) the liquid crystal material in the composite layer contains aromatic rings and exhibits a cholesteric phase, the substrate in the composite layer is made of resin and contains aromatic rings, and a ratio of the number of aromatic rings to that of carbon atoms in the main chain of monomer is in a range from 1:5 to 1:12; (B) the liquid crystal material in the composite layer is formed of a mixture of a liquid crystal material exhibiting a nematic phase and a liquid crystal material exhibiting a smectic phase, and exhibits a cholesteric phase as a whole; or (C) the liquid crystal material in the composite layer is formed of a mixture of a tolane liquid crystal material, a biphenyl liquid crystal material and a chiral ingredient, and exhibits a cholesteric phase as a whole.

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patent: 5731861 (1998-03-01), Hatano et al.
Cholesteric Liquid Crystal/Polymer Gel Dispersion Bistable at Zero Field, D. K. Yang, et al, IEEE, 1991, pp. 49-52.
Polymer-Stabilized Cholesteric Texture Materials for Black-On-White Displays, J. L. West, et al., SID Digest, 1994, pp. 608-610.
Cholesteric Liquid-Crystal/Polymer-Gel Dispersions: Reflective Display Applications, D. K. Yang, et al., SID Digest, 1992, pp. 759-761.

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