Liquid crystal display device
CA 1258114 A · Owner: N.V.Philips'Gloeilampenfabrieken · Inventors: Streit, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A liquid crystal display device having two linear polarizers and a nematic liquid crystal with positive dielectric anisotropy 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° to 90°, preferably between 70° and 80°. 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 …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted August 1, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 1, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.