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. 11, 2020
Filed:
Nov. 19, 2018
Applicants:
Gary D. Sharp, Boulder, CO (US);
Anthony D. Mcgettigan, Santa Rosa, CA (US);
Inventors:
Gary D. Sharp, Boulder, CO (US);
Anthony D. McGettigan, Santa Rosa, CA (US);
Assignee:
Gary Sharp Innovations, LLC, Boulder, CO (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02F 1/1347 (2006.01); G02F 1/13363 (2006.01); G02F 1/139 (2006.01);
U.S. Cl.
CPC ...
G02F 1/13471 (2013.01); G02F 1/1395 (2013.01); G02F 1/13363 (2013.01); G02F 1/133634 (2013.01); G02F 2001/133638 (2013.01); G02F 2413/11 (2013.01);
Abstract
Used herein are two or more switchable variable birefringence liquid crystal devices, in combination with a passive retarder, to produce a device that switches between two retardation values. The device preserves the normal-incidence retardation in each of two voltage states over a broad range of incidence angles using a novel self-compensation scheme. According to one embodiment of this design, the retardation in the thickness direction remains zero in both the unenergized and fully energized states.