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:
May. 15, 1990
Filed:
May. 01, 1987
Robert E McMurray, Jr, Berkeley, CA (US);
Steven M Jarrett, Los Altos, CA (US);
Electrohome Limited, , CA;
Abstract
A liquid crystal light valve is provided which comprises a pair of glass cover plates. Transparent electrodes are located on the interfaces of each cover plate. The electrodes are electrically connected to alternating current sources. Insulating films are placed on either side of a liquid crystal material to provide electrical and chemical isolation between the liquid crystal and the electrodes. Spacers are employed to maintain a suitable gap between the insulating films and to prevent the liquid crystal from escaping. Positioned on the side of the liquid crystal from which writing light enters the light valve are, respectively, a dielectric mirror, a light blocking layer and a photoactive layer. According to the present invention, the photoactive layer comprises hydrogenated amorphous silicon which is configured as a photodiode with a junction layer facing the writing light.