The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 23, 1980
Filed:
Feb. 02, 1979
Lydie Thirant, Paris, FR;
Thomson-CSF, Paris, FR;
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.