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公开(公告)号：US20240175676A1
公开(公告)日：2024-05-30
申请号：US18071298
申请日：2022-11-29
Applicant: Meta Platforms Technologies, LLC
Inventor： Yun-Han LEE , Scott Charles MCELDOWNEY , Lu LU , Mantas ZURAUSKAS , Qing CHAO
CPC classification number: G01B11/22 , G02F1/0136 , G02B27/283
Abstract: According to examples, a depth sensing apparatus may include an illumination source to output a light beam onto a polarizing beam separation element (PBSE). The PBSE may generate a right hand circularly polarized (RCP) beam and a left hand circularly polarized (LCP) beam to be projected onto a target area, in which the RCP beam and the LCP beam may create an interference with respect to each other. The depth sensing apparatus also includes an imaging component to capture an image of the target area with the RCP beam and the LCP beam projected on the target area, in which the captured image is to be analyzed for depth sensing of the target area. The depth sensing apparatus further includes a polarizer that may increase an intensity of the interference pattern.
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公开(公告)号：US20230194882A1
公开(公告)日：2023-06-22
申请号：US17553739
申请日：2021-12-16
Applicant: Meta Platforms Technologies, LLC
Inventor： Hao YU , Qing CHAO , Lu LU , Xinqiao LIU
CPC classification number: G02B27/0179 , G02B27/0172 , G02B27/286 , G03H1/0248 , G02B6/34 , G06F3/013 , G02B2027/0174 , G02B2027/0178 , G02B2027/0187
Abstract: An eye-tracking system includes a substrate transparent to visible light and configured to be placed in a field of view of an eye of a user, a plurality of waveguides on the substrate, a light source optically coupled to the plurality of waveguides, and a plurality of polarization volume holograms (PVHs) in the field of view of the eye of the user. Each PVH of the plurality of PVHs is optically coupled to a respective waveguide of the plurality of waveguides and is configured to couple a respective light beam out of the respective waveguide towards the eye of the user.
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