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:
Apr. 20, 2021
Filed:
Dec. 29, 2017
Applicant:
Palo Alto Research Center Incorporated, Palo Alto, CA (US);
Inventor:
Alex Hegyi, San Francisco, CA (US);
Assignee:
Palo Alto Research Center Incorporated, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 27/00 (2006.01); G02F 1/1335 (2006.01); G02F 1/139 (2006.01); G01J 3/45 (2006.01); G01J 3/453 (2006.01); G02B 27/42 (2006.01); G02F 1/13357 (2006.01); F21V 8/00 (2006.01); G01J 3/447 (2006.01);
U.S. Cl.
CPC ...
G02B 27/0081 (2013.01); G01J 3/447 (2013.01); G01J 3/45 (2013.01); G01J 3/4531 (2013.01); G02B 6/0033 (2013.01); G02B 27/4272 (2013.01); G02F 1/1395 (2013.01); G02F 1/133528 (2013.01); G02F 1/133615 (2013.01); G02F 2201/302 (2013.01);
Abstract
An optical device includes a liquid-crystal variable retarder. An exit-pupil expander is optically coupled to the liquid-crystal variable retarder, the exit-pupil expander includes: at least one optical input feature that receives reference light from a reference light source; and one or more optical coupling elements coupled to receive the reference light from the reference light source and expand the reference light to one or more spatially-separated regions of the liquid-crystal variable retarder.