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:
Jul. 28, 1998
Filed:
Aug. 13, 1997
George Liang-Tai Chiu, Cross River, NY (US);
Thomas Mario Cipolla, Katonah, NY (US);
Fuad Elias Doany, Katonah, NY (US);
Derek Brian Dove, Mt. Kisco, NY (US);
Alan Edward Rosenbluth, Yorktown Heights, NY (US);
Rama Nand Singh, Bethel, CT (US);
Janusz Stanislaw Wilczynski, Ossining, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An optical system is described consisting of reflection birefringent light valves, polarizing beam splitter, color image combining prisms, illumination system, projection lens, filters for color and contrast control, and screen placed in a configuration offering advantages for a high resolution color display. The system includes a quarter wave plate positioned to suppress stray reflection from the projection lens. The system also includes a second quarter wave plate disposed on the screen and a polarizing film disposed on the second quarter wave plate to suppress ambient light from illuminating the screen and entering the system.