Liquid crystal display device

Details Liquid crystal display device Liquid crystal display device

1989-04-28

1992-06-23

James, Andrew J.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359102, G02F 113

Patent

active

051248255

ABSTRACT:
A liquid crystal display device consisting essentially of a liquid crystal cell and a pair of polarizing plates disposed on the both sides of said liquid crystal cells is disclosed. The liquid crystal cell has a liquid crystal layer in which a nematic liquid crystal containing an optically active substance and forming a twisted structure is disposed between a pair of electrode substrates being oppositely disposed and each having an alignment layer, and said liquid crystal display device is characterized by satisfying Conditions (a) to (d);
Condition (a): a twist angle .alpha. of the twisted structure in the liquid crystal layer is 220.degree. to 300.degree.;
Condition (b): a pretilt angle .theta..sub.o made by a director of liquid crystal molecules contacting a face of the electrode substrate and the electrode substrate itself is not less than 25.degree.;
Condition (c): a product, .DELTA.n.multidot.d, of a refractive anisotropy, .DELTA.n, of the nematic liquid crystal and a thickness, d, of the liquid crystal layer is 0.65 to 0.90 .mu.m;
Condition (d): in the relation to the twist angle .alpha., angles .beta. and .gamma. made by polarizing axes of a pair of the polarizing plates and the directions of aligning treatments of the electrode substrates adjacent to the respective polarizing plates satisfy Equation (1);

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