Display systems with optical sensing

    公开(公告)号:US11809619B1

    公开(公告)日:2023-11-07

    申请号:US17077823

    申请日:2020-10-22

    申请人: Apple Inc.

    IPC分类号: G06F3/01 G02B27/01

    摘要: A head-mounted device may have catadioptric lenses that each include a partial mirror, a quarter wave plate, and a polarizer. An optical system in the head-mounted device may have an infrared light-emitting device and an infrared light-sensing device. The optical system may illuminate a user's eyes in eye boxes and may gather measurements from the illuminated eye boxes for eye tracking and other functions. The optical system may operate through the catadioptric lenses. To enhance optical system performance, the polarizers may be wire grid polarizers that are formed from conductive lines that exhibit enhanced infrared transmission and/or the quarter wave plates may be formed from cholesteric liquid crystal layers that serve as quarter wave plates at visible wavelengths and that do not serve as quarter wave plates at infrared wavelengths.

    Electronic Devices Having Transparent Crystalline Structures With Antireflection Coatings

    公开(公告)号:US20180024274A1

    公开(公告)日:2018-01-25

    申请号:US15617706

    申请日:2017-06-08

    申请人: Apple Inc.

    IPC分类号: G02B1/11 G02B3/00 G02B1/02

    CPC分类号: G02B1/113 G02B1/02

    摘要: A graded index antireflection layer may be formed on a transparent crystalline member such as a sapphire member. The graded index layer may include aluminum oxide and silicon oxide. The graded index layer may extend from a first surface at the transparent member to a second surface. The fraction of aluminum oxide in the graded index layer may be at a maximum at the first surface so that the index of refraction of the graded index layer at the first surface matches the index of refraction of the transparent member and may be at a minimum at the second surface so the index of refraction of the graded index layer is minimized at the second surface. The graded index layer may be annealed to form aluminum oxide nanocrystals in the graded index layer and to form a polycrystalline aluminum oxide adhesion layer at the first surface.