公开(公告)号：US20250028082A1

公开(公告)日：2025-01-23

申请号：US18904959

申请日：2024-10-02

Applicant: Apple Inc.

Inventor： Jian Gao ,  Francesco Aieta ,  Jaebum Chung ,  Ligang Wang ,  Se Baek Oh ,  Brandon Born

IPC: G02B1/11 ,  F21V8/00 ,  G02B5/18 ,  G02B27/01

Abstract: A display system may include a waveguide and at least one surface relief grating (SRG) structure. The SRG structure may include a plurality of ridges separated by a plurality of troughs. The SRG structure may include an anti-reflective layer to mitigate specular reflections off of the ridges. The anti-reflective layer may be formed above the ridges such that the ridges are interposed between the waveguide and the anti-reflective layer. In this type of arrangement, the anti-reflective layer may fill the troughs between the ridges or may be patterned to overlap the ridges without filing the troughs. The anti-reflective layer may be formed below the ridges such that the anti-reflective layer is interposed between the ridges and the waveguide. The SRG structure may include multiple anti-reflective layers. When multiple anti-reflective layers are included, the anti-reflective layers may have at least one differing property (e.g., material, number of layers, dimension).

公开(公告)号：US12158581B1

公开(公告)日：2024-12-03

申请号：US17390535

申请日：2021-07-30

Applicant: Apple Inc.

Inventor： Mark R. Ayres ,  Adam C. Urness ,  Jaebum Chung

IPC: G02B27/01 ,  G02B5/32 ,  G03H1/02 ,  G03H1/04 ,  G03H1/08

Abstract: An electronic device may provide images to an eye box. The device may include first and second sets of holograms that sequentially diffract light along an optical path. Each hologram in the first set may have a respective grating vector oriented along a common axis. Each of the grating vectors may have a respective magnitude. The magnitudes may be non-uniformly spaced across the first set of volume holograms. Similarly, each hologram in the second set may have a respective additional grating vector oriented along an additional common axis. Each of the additional grating vectors may have a respective additional magnitude. The additional magnitudes may be non-uniformly spaced across the second set of holograms. This may serve to produce diffracted light within filaments of k-space that mitigate angular harmonic sight lines in angle space, thereby preventing formation of non-uniformities in the images at the eye box.