Invention Grant
- Patent Title: Switchable diffractive optical element and waveguide containing the same
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Application No.: US16726130Application Date: 2019-12-23
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Publication No.: US11428938B2Publication Date: 2022-08-30
- Inventor: Oleg Yaroshchuk , Giuseppe Calafiore , Alireza Moheghi , Andrew Maimone , Barry David Silverstein
- Applicant: Meta Platforms Technologies, LLC
- Applicant Address: US CA Menlo Park
- Assignee: Meta Platforms Technologies, LLC
- Current Assignee: Meta Platforms Technologies, LLC
- Current Assignee Address: US CA Menlo Park
- Agency: Millburn IP PLLC
- Main IPC: G02B27/01
- IPC: G02B27/01 ; F21V8/00 ; G02B6/34 ; G02B27/00 ; G02B27/42

Abstract:
An optical device includes a light source assembly configured to generate an image light; and at least one waveguide including an in-coupling element and an out-coupling element configured to transmit, via the at least one waveguide, a plurality of light fields of the image light to an eye-box of the optical device, in a time-multiplexing manner. At least one of the in-coupling element or the out-coupling element includes at least one switchable diffractive optical grating, which includes a surface relief grating (SRG) filled with an optically anisotropic material having a first principal refractive index along a groove direction of the SRG and a second principal refractive index along an in-plane direction perpendicular to the groove direction. One of the first and second refractive principal refractive indices substantially matches a refractive index of the SRG, and the other mismatches.
Public/Granted literature
- US20210191122A1 SWITCHABLE DIFFRACTIVE OPTICAL ELEMENT AND WAVEGUIDE CONTAINING THE SAME Public/Granted day:2021-06-24
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