Thermo-optique smectic liquid-crystal storage display

Details Thermo-optique smectic liquid-crystal storage display Thermo-optique smectic liquid-crystal storage display

1979-02-02

1980-12-23

Bauer, Edward S.

350350S, G02F 1133

Patent

active

042407125

ABSTRACT:
The invention describes a liquid crystal display device with storage and local erasure, utilizing a thermo-optical effect to write an image under the form of scattering points in a layer of a material exhibiting a smectic mesophase. The energy necessary for the writing of the image is considerable reduced by effecting the change from the transparent to the scattering state without leaving the smectic mesophase. This result is obtained by treating the walls enclosing the layer so as to impart to smectic material a first given uniform orientation and imposing it, by the action of an electric field, a second uniform orientation perpendicular to the first; under local heating to a temperature in the neighborhood of the smectic-nematic transition temperature, the material tends to take up again the orientation imparted by the walls, thus locally generating a scattering structure.

REFERENCES:
patent: 3796999 (1974-03-01), Kahn

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