Positive-type display device using guest-host type mixture of li

Details Positive-type display device using guest-host type mixture of li Positive-type display device using guest-host type mixture of li

1979-06-20

1981-09-29

Bauer, Edward S.

350340, G02F 1133

Patent

active

042919495

ABSTRACT:
A positive-type display device improved in response time and in uniformity of display images is provided. This display device has a cell structure containing a mixture consisting of at least one of nematic liquid crystals having a nematic dielectric anisotropy and at least one of pleochroic dyes in a closed thin space formed by two substrates which are parallel to each other and a spacer which is provided between ends of said two substrates. Each of said two substrates has an electrode film adherently attached to its surface within said closed space, and an alignment film is formed on at least one of said electrode films. The surfaces of said films which are brought into contact with said mixture are subjected to a treatment for orientation of the molecules of said liquid crystals and said dyes in a direction substantially normal to the plane of the substrate when a voltage is not applied. Said positive-type display device is characterized in that the longitudinal axes of the molecules in said mixture contained in said space are inclined at an angle of 3.degree. to 30.degree. relative to the normal to said substrate in their quiescent state at no voltage.

REFERENCES:
patent: 3864022 (1975-02-01), Moriyama et al.
patent: 4030997 (1977-06-01), Miller et al.
Chabiovsky et al., "Liquid-Crystal Cells with Special Electrodes for the Generation of Uniform Colors by Optical Birefringence", IEEE Trans. on Electron Devices, vol. ED-24, pp. 807-810, Jul., 1977.

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