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:
Jan. 11, 1983
Filed:
Feb. 03, 1981
Jean-Pierre Huignard, Paris, FR;
Serge Le Berre, Paris, FR;
Christian Mayeux, Paris, FR;
Francois Micheron, Paris, FR;
Thomson-CSF, Paris, FR;
Abstract
The invention provides an image converter device which utilizes a liquid crystal cell in which a layer of a nematic material or a nematic-cholesteric mixture is enclosed between a first plate of a photoconductive material, provided with an external electrode, and a second transparent plate, provided with an internal electrode. The photoconductive material may be bismuth oxide, or a mixture of the latter with germanium or silicon oxide. A direct or alternative voltage is applied between the electrodes. An X-rays image, or an image displayed on the screen of a C.R. tube is projected onto the photoconductive plate whose conductivity, thus spatially modulated, causes a spatially variable voltage to be applied in the liquid crystal layer. Various electro-optical effects, such as dynamic scattering, controlled birofringence or controlled rotatory polarization in a twisted structure, can be used to make the projected image to appear in the liquid crystal layer illuminated by a visible light read-out beam and be directly observed or enlarged by projection onto a screen.