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    Display device having diffraction gratings with reduced polarization sensitivity
    21.
    发明授权
    Display device having diffraction gratings with reduced polarization sensitivity 有权

    公开(公告)号：US11327315B2

    公开(公告)日：2022-05-10

    申请号：US16930897

    申请日：2020-07-16

    Applicant: Magic Leap, Inc.

    Inventor： Kang Luo ,  Vikramjit Singh ,  Nai-Wen Pi ,  Shuqiang Yang ,  Frank Y. Xu

    IPC: G02B27/01 ,  G02B6/34 ,  G02B5/18

    Abstract: Blazed diffraction gratings provide optical elements in head-mounted display systems to, e.g., incouple light into or out-couple light out of a waveguide. These blazed diffraction gratings may be configured to have reduced polarization sensitivity. Such gratings may, for example, incouple or outcouple light of different polarizations with similar level of efficiency. The blazed diffraction gratings and waveguides may be formed in a high refractive index substrate such as lithium niobate. In some implementations, the blazed diffraction gratings may include diffractive features having a feature height of 40 nm to 120 nm, for example, 80 nm. The diffractive features may be etched into the high index substrate, e.g., lithium niobate.

    Superimposed diffraction gratings for eyepieces
    22.
    发明授权
    Superimposed diffraction gratings for eyepieces 有权

    公开(公告)号：US10942306B2

    公开(公告)日：2021-03-09

    申请号：US16685505

    申请日：2019-11-15

    Applicant: Magic Leap, Inc.

    Inventor： Shuqiang Yang ,  Vikramjit Singh ,  Kang Luo ,  Nai-Wen Pi ,  Frank Y. Xu, Jr.

    IPC: G02B6/00 ,  F21V8/00 ,  G02B25/00 ,  G02B27/00

    Abstract: Embodiments of the present disclosure are directed to techniques for manufacturing an eyepiece (or eyepiece layer) by applying multiple, different diffraction gratings to a single side of an eyepiece substrate instead of applying different gratings to different sides (e.g., opposite surfaces) of the substrate. Embodiments are also directed to the eyepiece (or eyepiece layer) that is arranged to have multiple, different diffraction gratings on a single side of the eyepiece substrate. In some embodiments, two or more grating patterns are superimposed to create a combination pattern in a template (e.g., a master), which is then used to apply the combination pattern to a single side of the eyepiece substrate. In some embodiments, multiple layers of patterned material (e.g., with differing refraction indices) are applied to a single side of the substrate. In some examples, the combined grating patterns are orthogonal pupil expander and exit pupil expander grating patterns.

    Optical eyepiece using single-sided patterning of grating couplers
    30.
    发明授权
    Optical eyepiece using single-sided patterning of grating couplers 有权

    公开(公告)号：US11609418B2

    公开(公告)日：2023-03-21

    申请号：US17246936

    申请日：2021-05-03

    Applicant: Magic Leap, Inc.

    Inventor： Kang Luo ,  Vikramjit Singh ,  Nai-Wen Pi ,  Shuqiang Yang ,  Frank Y. Xu

    IPC: G02B25/00 ,  G02B6/293

    Abstract: An eyepiece includes a substrate and an in-coupling grating patterned on a single side of the substrate. A first grating coupler is patterned on the single side of the substrate and has a first grating pattern. The first grating coupler is optically coupled to the in-coupling grating. A second grating coupler is patterned on the single side of the substrate adjacent to the first grating coupler. The second grating coupler has a second grating pattern different from the first grating pattern. The second grating coupler is optically coupled to the in-coupling grating.

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