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. 28, 2007
Filed:
Nov. 12, 2004
Jiaying MA, Maplewood, MN (US);
David J. Aastuen, Shoreview, MN (US);
Charles L. Bruzzone, Woodbury, MN (US);
William W. Merrill, White Bear Lake, MN (US);
Timothy J. Hebrink, Oakdale, MN (US);
Harry E. Johnson, Hudson, WI (US);
Fuming B. LI, Woodbury, MN (US);
Jiaying Ma, Maplewood, MN (US);
David J. Aastuen, Shoreview, MN (US);
Charles L. Bruzzone, Woodbury, MN (US);
William W. Merrill, White Bear Lake, MN (US);
Timothy J. Hebrink, Oakdale, MN (US);
Harry E. Johnson, Hudson, WI (US);
Fuming B. Li, Woodbury, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A projection engine uses a first polarizing beam splitter (PBS) that substantially reflects light incident along a first input direction in a first polarization state and substantially transmits light incident in the first input direction in a second polarization state orthogonal to the first polarization state. The first PBS demonstrates an angularly dependent reflectivity for light in the second polarization state that is asymmetric about the first input direction. At least two imager devices are positioned to receive light reflected and transmitted by the first PBS respectively. The imager devices modulate the incident light with an image. The image light from the imagers is combined and projected.