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公开(公告)号：US20210181390A1
公开(公告)日：2021-06-17
申请号：US16733998
申请日：2020-01-03
Applicant: TRIPLE WIN TECHNOLOGY(SHENZHEN) CO.LTD.
Inventor： JI-PENG LIU , CHUN-HUNG CHEN
Abstract: A diffractive optical structure achieving high resolution to facilitate face recognition includes a first diffractive element and a second diffractive element. The first diffractive element includes first grating structures and the second diffractive element comprises second grating structures. The second grating structures each face and are spaced apart from the first grating structures, an adhesive with certain optical properties is infilled between the first grating structure and the second grating structure.
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