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:
Jan. 12, 2021
Filed:
Oct. 18, 2019
Facebook Technologies, Llc, Menlo Park, CA (US);
Yingfei Jiang, Menlo Park, CA (US);
Afsoon Jamali, Menlo Park, CA (US);
Changwon Jang, Menlo Park, CA (US);
Adrian Travis, Menlo Park, CA (US);
Andrew Maimone, Menlo Park, CA (US);
Lu Lu, Menlo Park, CA (US);
FACEBOOK TECHNOLOGIES, LLC, Menlo Park, CA (US);
Abstract
An optical device is provided. The optical device includes an optical grating. The optical grating includes two electrodes arranged opposite to each other and a liquid crystal (LC) composition sandwiched between the electrodes. The two electrodes provide a driving voltage to the optical grating. The LC mixture includes a host LC and one or more LC dimers dissolved as a guest in the host LC. The host LC and the one or more LC dimers have respective dielectric anisotropies of opposite signs in nematic phase. A net dielectric anisotropy of the LC mixture is substantially neutral at a predetermined temperature.