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. 10, 1999
Filed:
Jul. 29, 1998
Yukinori Shioya, Tokyo, JP;
NEC Corporation, , JP;
Abstract
An optical system for a liquid crystal projector in which the deterioration of the contrast of a projection screen is prevented. The optical system, comprising: a light source 1 for emitting a white light, an optical divider 4, 5 for dividing said white light into red, green and blue lights, a liquid crystal display panel 17, 18, 19 for modulating each of said red, green and blue light, a polarizer 14, 15, 16 for polarizing each of said modulated red, green and blue light, an optical synthesis element 21 for synthesizing each of said polarized red, green and blue light, and a green-light removing element 23, 24, 25 for removing green light disposed between said liquid crystal display panel for said blue light and said color synthesis element. The green-light removing element 23, 24, 25 removes is provided between the blue-light modulating LCD panel 19 and the color synthesis element 21. Therefore the deterioration of the contrast of the blue-light modulating LCD panel 19 can be prevented.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile