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.

公开(公告)号：US20240036325A1

公开(公告)日：2024-02-01

申请号：US18349501

申请日：2023-07-10

Applicant: Apple Inc.

Inventor： Itai Afek ,  Ariel Lipson ,  Eran Tal ,  Mark R. Ayres ,  Ken Anderson ,  Maria I. Campana ,  Daniel Ott ,  Roei Remez ,  Sagee Rosen

IPC: G02B27/01 ,  G02B27/00 ,  G02B5/32 ,  G02B5/02 ,  G02B26/08 ,  G02B26/10 ,  F21V8/00 ,  G02B17/00

CPC classification number: G02B27/0172 ,  G02B27/0093 ,  G02B5/32 ,  G02B5/0252 ,  G02B26/0858 ,  G02B26/105 ,  G02B6/0036 ,  G02B6/0025 ,  G02B17/006 ,  G02B2027/0174 ,  G02B2027/0138

Abstract: A display may include an optical emitter that emits infrared light, a first coupler that couples the infrared light into a waveguide, and a second optical coupler that couples the infrared light out of the waveguide and towards the eye box. The infrared light may reflect off an eye as reflected light. The second optical coupler may couple the reflected light into the waveguide and the first optical coupler may couple the reflected light out of the waveguide and towards a camera for performing gaze tracking operations based on the sensor data. The display may sequentially illuminate different regions of the eye with the infrared light at different times using a scanning mirror, an array of light sources, or a wavelength-adjustable light source and gratings. This may minimize infrared light scattering, which minimizes background generation and maximizes signal-to-noise ratio for gaze tracking operations.

公开(公告)号：US11966053B2

公开(公告)日：2024-04-23

申请号：US16714530

申请日：2019-12-13

Applicant: Apple Inc.

Inventor： Jonathan B. Pfeiffer ,  Adam C. Urness ,  Friso Schlottau ,  Mark R. Ayres ,  Vikrant Bhakta

IPC: G02B27/01 ,  F21V8/00 ,  G02B6/02 ,  G02B6/28 ,  G02B6/42 ,  G02B27/09

CPC classification number: G02B27/0103 ,  G02B6/0016 ,  G02B6/0026 ,  G02B6/02057 ,  G02B6/02076 ,  G02B6/2848 ,  G02B6/4204 ,  G02B6/4214 ,  G02B27/0172 ,  G02B27/0972 ,  G02B2027/0116 ,  G02B2027/0174

Abstract: Systems and methods of dispersion compensation in an optical device are disclosed. A holographic optical element may include a set of different holograms in a grating medium. Each hologram in the set may have a corresponding grating vector with a grating frequency and direction. The directions of the grating vectors may vary as a function of the grating frequency. Different holograms in the set may diffract light in a particular direction so that the light emerges from a boundary of the grating medium in a single given direction regardless of wavelength. A prism may be used to couple light into the grating medium. The prism may be formed using materials having dispersion properties that are similar to the dispersion properties of the grating material. The prism may have an input face that receives perpendicular input light. The prism may include multiple portions having different refractive indices.