公开(公告)号：US20250164788A1

公开(公告)日：2025-05-22

申请号：US18516142

申请日：2023-11-21

Applicant: GOOGLE LLC

Inventor： Alexander Koshelev ,  Christophe Peroz

IPC: G02B27/01 ,  G02B6/34

Abstract: A reflective waveguide includes active and inactive facets that are non-selectively coated with a partially reflective coating while minimizing reflections from the inactive facets without using a stencil mask. The partially reflective coating has a refractive index that is closely matched to a refractive index of a polymer substrate of the waveguide, is applied using a directional deposition technique such that the coating is thicker on the active prism facets than on the inactive prism facets, and the backside of the prism facets is angled such that the angle of incidence of display light on the backside of the prism facets is less than approximately 80 degrees.

公开(公告)号：US20250110339A1

公开(公告)日：2025-04-03

申请号：US18903976

申请日：2024-10-01

Applicant: GOOGLE LLC

Inventor： Alexander Koshelev ,  Christophe Peroz

IPC: G02B27/01

Abstract: A lightguide for a head-wearable display or near-eye display includes an incoupler configured to direct display light representative of an image to the eye of a user. To direct the display light, the lightguide includes an incoupler that has reflectors configured to first direct the display light into the lightguide such that the display light propagates through the body lightguide and is received at a combined exit pupil expansion and outcoupling structure of the lightguide. This combined exit pupil expansion and outcoupling structure includes an array of louver retroreflectors that expands the eyebox of the image and also directs at least a portion of the display light out of the lightguide and toward the eye of the user. The louver retroreflectors in the array of louver retroreflectors each includes a first reflective surface and a second reflective surface arranged substantially orthogonal to each other.

公开(公告)号：US20240353609A1

公开(公告)日：2024-10-24

申请号：US18640454

申请日：2024-04-19

Applicant: GOOGLE LLC

Inventor： Alexander Koshelev ,  Christophe Peroz

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

CPC classification number: G02B6/0038 ,  G02B5/1814 ,  G02B5/1861 ,  G02B6/0016 ,  G02B27/0172 ,  G02B2027/011 ,  G02B2027/0178

Abstract: A waveguide includes a mirror region, a non-mirror region, and a mitigation element. The mitigation element mitigates a phase difference between a first beam portion passing through the mirror region and a second beam portion passing through the non-mirror region. The mitigation element includes, for example, mirrors that are phase matched to the surrounding waveguide core, tapered or serrated mirrors, or phase compensating layers on the surface of the waveguide.