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. 01, 2001
Filed:
Nov. 12, 1999
Barco N.V., Poperinge, BE;
Abstract
The present invention relates to a light valve image projector with a disposition for improving the contrast of an optical image projected on a screen by that projector. The projector comprises at least one illumination system, at least one field lens, at least one set consisting of a polarizer, an LCD and an analyzer and at least a projection lens, and presents at least one optical axis which includes an angle &agr; with the optical axis of the projection lenses. The invention consists in positioning the analyzer so that it includes an angle larger than &agr; with the LCD, at least for the light rays that pass through the contrast limited area of the LCD. The invention consists furthermore in placing the polarizer so that it includes an angle larger than &agr; with the LCD. Both the analyzer and/or the polarizer may have a flat or a curved surface.