公开(公告)号：US20250035924A1

公开(公告)日：2025-01-30

申请号：US18716461

申请日：2022-12-09

Applicant: Snap Inc.

Inventor： Ciaran Padraic Phelan ,  Matthew Proctor ,  Kai Wang ,  Parashara Panduranga ,  David Louis Maxime Poussin

IPC: G02B27/01 ,  F21V8/00

Abstract: A waveguide for use in an augmented reality or virtual reality display, comprising: a waveguide substrate layer having a planar surface; and a plurality of optical structures extending into or out of the planar surface;
wherein the plurality of optical structures are arranged in an array to provide at least one diffractive optical element in the waveguide, and the at least one diffractive optical element is configured to receive light from an input direction within the plane of the waveguide and to diffract a portion of the received light out of the waveguide towards a viewer;
wherein, in a plane defined by the input direction and a direction perpendicular to the planar surface, at least one of the optical structures has a cross-section comprising a top edge, a first side edge and a second side edge, the first side edge extends from the planar surface to a leading end of the top edge, the top edge extends from the leading end in a major direction parallel to the input direction to a following end, and the second side edge extends from the following end of the top edge to the planar surface,
wherein: the first side edge has a first oblique major direction away from the planar surface where the first oblique major direction is neither parallel to the planar surface nor perpendicular to the planar surface, and/or the second side edge has a second oblique major direction towards the planar surface where the second oblique major direction is neither parallel to the planar surface nor perpendicular to the planar surface.