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:
Aug. 04, 1987
Filed:
May. 23, 1983
Peter Streit, Widen, CH;
U.S. Philips Corporation, New York, NY (US);
Abstract
A liquid crystal display device having two linear polarisers and a nematic liquid crystal with positive dielectric anisotropy. The liquid crystal is illuminated by a light source which is arranged in a fixed spatial relationship to the display. Behind the display, a diffusely scattering, metallic reflector is provided. The angle of incidence of the light relative to the perpendicular on the surface of the front carrier plate is in the range from 50.degree. to 90.degree., preferably between 70.degree. and 80.degree.. The operating voltage of the display device according to the invention is less than 2.0 times the Freedericksz threshold voltage of the liquid crystal. In this way, optimum contrast is achieved, coupled with a very large range of viewing angle. With this display device, very high multiplex rates (up to 1:120) can be reached.