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:
Sep. 05, 1978
Filed:
Apr. 27, 1977
Werner Cirkler, Ismaning, DE;
Hans Krueger, Munich, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
An optical display device having a high contrast in the light intensity of the image being displayed relative to the background light characterized by a liquid crystal cell having a layer of liquid crystal material interposed between spaced front and rear transparent carrier plates which have transparent electrodes on their inner surfaces facing the layer and a fluorescent plate of material, which has an index of refraction greater than 1, and fluorescent centers creating fluorescent light from an ambient light, being disposed behind the liquid crystal cell in the direction of viewing with the surface of the fluorescent plate being in direct contact with an outer surface of the rear carrier plate. In this device, a selective application of voltage to the selected electrodes of the cell will cause a change in the optical properties of the liquid crystal layer to decouple light from the display with an intensity substantially greater than the intensity of the background of the display. Preferably, the liquid crystal cell is received within a recess in the plate so that the outer surface of the front plate is flush with the remaining surface of the fluorescent plate. If desired, an additional illuminating device may be encapsulated within the plate to provide an additional source of light.