公开(公告)号：US12164106B2

公开(公告)日：2024-12-10

申请号：US17287479

申请日：2019-07-24

Applicant: Snap Inc.

Inventor： Ciaran Phelan ,  Sophia Antonia Fox ,  Mohmed Salim Valera ,  Arseny Alexeev

IPC: G02B27/01 ,  F21V8/00

Abstract: An optical structure is disclosed for use in an augmented reality display. The structure includes a waveguide (52) and an input diffractive optical structure (54) configured to receive light from a projector and couple the received light into the waveguide (52). An output diffractive optical structure (60) is configured to receive light from the input diffractive optical element (54) in an input direction, wherein the output diffractive optical structure comprises at least a first diffractive optical element (30) and a second diffractive optical element (32) with different respective diffraction efficiencies, wherein the first diffractive optical element has a relatively high diffraction efficiency and the second diffractive optical element has a relatively low diffraction efficiency and the first and second diffractive optical elements are overlaid on one another in or on the waveguide. The output diffractive optical structure (60) comprises a first portion (62) and a second portion (64). In the first portion (62) the first diffractive optical element is configured to couple light from the input direction towards the second portion (64) and the second diffractive optical element is configured to couple light from the input direction away from the second portion. In the second portion (64) the first diffractive optical element is configured to couple light from the input direction towards the first portion (62) and the second diffractive optical element is configured to couple light from the input direction away from the first portion (62).

公开(公告)号：US20240361605A1

公开(公告)日：2024-10-31

申请号：US18771278

申请日：2024-07-12

Applicant: Snap Inc.

Inventor： Ciaran Phelan ,  Sophia Antonia Fox ,  Mohmed Salim Valera ,  Arseny Alexeev

IPC: G02B27/01

CPC classification number: G02B27/0172 ,  G02B6/0023 ,  G02B6/005

Abstract: An optical structure for an augmented reality display includes a waveguide and an input diffractive optical structure to receive light from a projector and couple the received light into the waveguide. An output diffractive optical structure, comprising first and second diffractive optical elements overlaid on one another in or on the waveguide, receives light from the input diffractive optical element in an input direction. The first diffractive optical element has a high diffraction efficiency relative to the second diffractive optical element. A first portion of the first diffractive optical element couples light from the input direction towards a second portion, and the second diffractive optical element couples light from the input direction away from the second portion. The second portion couples light from the input direction towards the first portion, and the second diffractive optical element couples light from the input direction away from the first portion.