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. 27, 2018
Filed:
Jun. 30, 2017
Applicant:
Castar, Inc., Palo Alto, CA (US);
Inventors:
Wei Rong, San Jose, CA (US);
Evan Coons, Hayward, CA (US);
Jeri J. Ellsworth, San Jose, CA (US);
Ken Clements, Los Gatos, CA (US);
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 27/28 (2006.01); G02B 27/42 (2006.01); G02B 27/01 (2006.01); G02B 17/08 (2006.01);
U.S. Cl.
CPC ...
G02B 27/283 (2013.01); G02B 27/0101 (2013.01); G02B 27/4211 (2013.01); G02B 17/0884 (2013.01); G02B 2027/011 (2013.01);
Abstract
A head mounted projection display includes a polarizing beam splitter stack that includes a waveplate. The polarizing beam splitter stack reduces optical losses and has a low forward extension. The polarizing beam splitter may be used at a 45 degree angle or at a non 45 degree angle relative to the line of view. A correction may be also be performed to the intensity of individual pixels to account for chromatic non-uniformity in the optical response of a retroreflector and other optical components.