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:
Sep. 06, 2022
Filed:
Dec. 30, 2020
Meta Platforms Technologies, Llc, Menlo Park, CA (US);
Afsoon Jamali, Redmond, WA (US);
Arman Boromand, Redmond, WA (US);
Jasmine Soria Sears, Kirkland, WA (US);
Sandro Pintz, Menlo Park, CA (US);
META PLATFORMS TECHNOLOGIES, LLC, Menlo Park, CA (US);
Abstract
A switchable optical retardation device includes a switchable retardation element including liquid crystals and an electrical driver circuit. While in a first state, the switchable retardation element modifies light transmitted through the switchable retardation element by causing a phase shift of a first retardation angle. While in a second state, the switchable retardation element modifies the light transmitted through the switchable retardation element by causing a phase shift of a second retardation angle distinct from the first retardation angle. The electrical driver circuit provides a first voltage for placing the switchable retardation element in the first state and a second voltage for placing the switchable retardation element in the second state. The first voltage is greater than the second voltage, the second voltage is a non-zero voltage, and the electrical driver circuit alternatingly provides the first voltage and the second voltage with a predefined frequency.