Invention Grant
- Patent Title: Device including diffractive optical element
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Application No.: US17029963Application Date: 2020-09-23
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Publication No.: US11592681B2Publication Date: 2023-02-28
- 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: G02B27/42
- IPC: G02B27/42 ; G02B6/02 ; G02B6/293 ; G02B27/01 ; G02B27/28 ; F21V8/00

Abstract:
A device includes a waveguide, an in-coupling element, and an out-coupling element coupled with the waveguide. The waveguide, the in-coupling element, and the out-coupling element are configured to deliver a plurality of portions of an image light to an eye-box of the device. At least one of the in-coupling element or the out-coupling element includes a polarization selective diffractive element. The polarization selective diffractive element includes a grating including a plurality of microstructures defining a plurality of grooves filled with a passive optically anisotropic material having a first effective refractive index along a groove direction of the grooves and a second effective refractive index along an in-plane direction perpendicular to the groove direction. One of the first effective refractive index or the second effective refractive index substantially matches with a refractive index of the microstructures.
Public/Granted literature
- US20220091323A1 DEVICE INCLUDING DIFFRACTIVE OPTICAL ELEMENT Public/Granted day:2022-03-24
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