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:
Oct. 15, 1996
Filed:
Jun. 08, 1992
Stephen J Reinsch, Vista, CA (US);
Hughes-JVC Technology Corporation, Carlsbad, CA (US);
Abstract
A liquid crystal light valve (12) is sequentially modulated with images corresponding to three primary color components of a scene at a rate which is faster than flicker can be perceived. A color switching apparatus (20) receives a white light beam from a high intensity light source (18), separates the white light beam into three color light beams of the respective primary colors, and sequentially illuminates the light valve (12) with the three color light beams in synchronism with modulation of the light valve (12) with the corresponding color image components. An optical system (26) projects an image of the modulated light valve surface on a screen (28), such that the three color component images appear to merge together in time and thereby synthesize a full color image of the scene. The switching apparatus (20) includes a polarizing beam splitter (30), three dichroic reflectors (34,36,46) which separate the white light beam into the three color light beams, and electrically switchable polarization rotators (38,40,48). The rotators (36,40,48), in combination with the beam splitter (30), control the polarizations of the color light beams such that only a selected one of the beams is directed to an output with a predetermined polarization suitable for illumination of the light valve (12), and the other two colors are effectively switched off.