Invention Grant
- Patent Title: Spatially multiplexed volume Bragg gratings with varied thicknesses for waveguide display
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Application No.: US16840119Application Date: 2020-04-03
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Publication No.: US11624917B2Publication Date: 2023-04-11
- Inventor: Wanli Chi , Dominic Meiser , Yang Yang , Wai Sze Tiffany Lam , Pasi Saarikko
- 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: Weaver Austin Villeneuve & Sampson LLP
- Main IPC: G02B27/01
- IPC: G02B27/01 ; F21V8/00 ; G02B27/00 ; G02B27/44 ; H04N9/31 ; G02B1/11 ; G02B27/42

Abstract:
A waveguide display includes a waveguide and a grating coupler configured to couple display light into or out of the waveguide. The grating coupler includes at least a first grating layer and a second grating layer arranged in a stack. The first grating layer is characterized by a first thickness and includes a first transmission VBG configured to diffract display light of a first wavelength from a first field of view. The second grating layer is characterized by a second thickness greater than the first thickness and includes a second transmission VBG configured to diffract display light of the first wavelength from a second field of view greater than the first field of view.
Public/Granted literature
- US20210055555A1 SPATIALLY MULTIPLEXED VOLUME BRAGG GRATINGS WITH VARIED THICKNESSES FOR WAVEGUIDE DISPLAY Public/Granted day:2021-02-25
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