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:
Jun. 01, 2021
Filed:
Jan. 31, 2019
Facebook Technologies, Llc, Menlo Park, CA (US);
Andrew John Ouderkirk, Redmond, WA (US);
Wanli Chi, Sammamish, WA (US);
Kenneth Diest, Kirkland, WA (US);
Renate Eva Klementine Landig, Seattle, WA (US);
Tanya Malhotra, Redmond, WA (US);
Austin Lane, Bellevue, WA (US);
Christopher Yuan Ting Liao, Seattle, WA (US);
Katherine Marie Smyth, Seattle, WA (US);
Jack Lindsay, Seattle, WA (US);
Facebook Technologies, LLC, Menlo Park, CA (US);
Abstract
A display device includes a scanned projector for projecting a beam of light, and a diffraction grating for dispersing the light at a plurality of angles into a waveguide, wherein at least a portion of the diffraction grating includes a nanovoided polymer. Manipulation of the nanovoid topology, such as through capacitive actuation, can be used to reversibly control the effective refractive index of the nanovoided polymer and hence the grating efficiency. The switchable grating can be used to control the amount of diffraction of an incident beam of light through the grating thereby decreasing optical loss. Various other methods, systems, apparatuses, and materials are also disclosed.