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:
Nov. 30, 1999
Filed:
Mar. 29, 1996
Applicant:
Inventor:
Dennis F Vanderwerf, Austin, TX (US);
Assignee:
3M Innovative Properties Company, St. Paul, MN (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ; G02B / ;
U.S. Cl.
CPC ...
359487 ; 359495 ; 359496 ; 359619 ; 359625 ; 359627 ; 359640 ; 359834 ; 359837 ;
Abstract
An illumination system is described that efficiently produces linear polarized light for use in LCD projection. A polarizing beam splitter and half-wave retarder plate produce two adjacent collimated beams of light having a common polarization direction. These adjacent beams are spatially integrated into a single collimated polarized beam whose aspect ratio is subsequently converted to match that of the LCD format.