Invention Grant
- Patent Title: Optical assemblies having polarization volume gratings for projecting augmented reality content
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Application No.: US17326074Application Date: 2021-05-20
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Publication No.: US11624922B2Publication Date: 2023-04-11
- Inventor: Brian Wheelwright , Yun-Han Lee , Babak Amirsolaimani , Weichuan Gao
- 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: Morgan, Lewis & Bockius LLP
- Main IPC: G02B27/01
- IPC: G02B27/01

Abstract:
An optical assembly for projecting light output by a display includes an optical waveguide, a reflective optical element, and a in-coupler coupled with the optical waveguide. The reflective optical element is positioned to receive first light and to reflect the first light as second light. The in-coupler is positioned to receive the first light and transmit the first light toward the reflective optical element. The in-coupler is further positioned to receive the second light and redirect a first portion of the second light so that the first portion of the second light undergoes total internal reflection inside the optical waveguide. The reflective optical element includes a negative meniscus lens having a concave lens surface and a convex lens surface coupled with a reflective surface. The reflective optical element is positioned to focus the first light such that the second light is more collimated than the first light.
Public/Granted literature
- US20210271089A1 OPTICAL ASSEMBLIES HAVING POLARIZATION VOLUME GRATINGS FOR PROJECTING AUGMENTED REALITY CONTENT Public/Granted day:2021-09-02
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