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:
Mar. 23, 1999
Filed:
Jul. 31, 1998
Applicant:
Inventors:
Maurice E Levis, Hampton, VA (US);
Helen Gourley, San Francisco, CA (US);
Assignee:
Torch Technologies LLC, Hampton, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
353122 ; 353 20 ; 349-9 ;
Abstract
A projector system includes a lamp, a reflector collector optic, a light pipe, a Polarizing Beam Splitter (PBS), and an LCD (Liquid Crystal Display) panel. The light pipe has a square or octagonal entrance pupil, reflecting internal walls coated with a cold mirror coating, is tapered in shape, and has a rectangular exit pupil. The PBS converts an unpolarized beam from the exit pupil of the light pipe into a uni-polarized beam which it directs to the LCD panel.