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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
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.-
公开(公告)号：US20240411067A1
公开(公告)日：2024-12-12
申请号：US18697978
申请日：2022-12-08
Applicant: Snap Inc.
Inventor： Alexandra Crai , Ciaran Padraic Phelan
Abstract: A diffraction grating for use as an output element of a diffractive waveguide combiner for an augmented reality or virtual reality display. First and second periodic arrays of optical structures are arranged on a plane according to a common unit cell which is oblique, first and second periods, respectively, of the diffraction grating being defined by a spacing between neighbouring optical structures of one of the first and second periodic arrays along a first side and second side, respectively, of the common unit cell. The first periodic array of optical structures is overlaid on the second periodic array of optical structures in the plane such that the arrays are spatially offset from one another on the plane.
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公开(公告)号：US20250035929A1
公开(公告)日：2025-01-30
申请号：US18716025
申请日：2022-12-05
Applicant: Snap Inc.
Inventor： Alexandra Crai , Ciaran Padraic Phelan , Christian William Olavi Sol , David Louis Maxime Poussin , Mohmed Salim Valera , Kai Wang , Alison Laura Smith , Simeng Jia
IPC: G02B27/01
Abstract: An optical assembly is disclosed in which two input pupils of light are projected onto an input grating. The input pupils can be overlapping or non-overlapping. The input grating is configured to receive the input pupils and to diffract them so that they are coupled towards an output element in parallel directions that are laterally separated from one another. The input pupils can be received respectively at a first portion and a second portion of an output element, on either side of a dividing line. The input pupils are received at positions that are symmetrically displaced from the dividing line. The first portion and the second portion are mirror-images of one another, and each can expand light from respective input pupils in an equal and opposite way.
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