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：US20240351251A1

公开(公告)日：2024-10-24

申请号：US18640071

申请日：2024-04-19

Applicant: GOOGLE LLC

Inventor： Kang Luo ,  Thomas Mercier ,  Christophe Peroz

IPC: B29C33/38 ,  B29D11/00

CPC classification number: B29C33/3842 ,  B29D11/00663

Abstract: Techniques for fabricating a polymer reflective waveguide mold with high structural quality control (flatness, alignment, dimensions) and high precision and groove parallelism for high optical quality include using optical lithography and wet etch process. For example, a method of fabricating a reflective waveguide mold includes depositing a hard mask layer on a crystalline substrate, lithographically patterning the hard mask layer, and anisotropically removing the crystalline substrate to form a prism array waveguide mold.

公开(公告)号：US20250076563A1

公开(公告)日：2025-03-06

申请号：US18810012

申请日：2024-08-20

Applicant: GOOGLE LLC

Inventor： Kang Luo ,  Thomas Mercier ,  Christophe Peroz

IPC: F21V8/00 ,  G02B6/36

Abstract: A fabrication process uses casting to form portions of a waveguide having ultra-flat surfaces. A casting resin is coated between a prism mold and a top flat mold via inkjet, slot die, spray coating, etc. The top flat mold is lowered to conform with the casting resin and the casting resin is then cured to form a bottom prism array. After curing, the bottom prism array is demolded from the prism mold and the top flat mold is used as a carrier wafer to support the bottom prism array. The bottom prism array is selectively coated with a reflective coating and a second casting process is performed by coating the bottom prism array with casting resin to form a reflective waveguide.

公开(公告)号：US20250035836A1

公开(公告)日：2025-01-30

申请号：US18226069

申请日：2023-07-25

Applicant: GOOGLE LLC

Inventor： Ahmed Drammeh ,  Christophe Peroz ,  Constantin-Christian A. Voll ,  Ali Karbasi

IPC: F21V8/00 ,  G02B27/01

Abstract: Overmolding or overcasting one portion of a reflective waveguide to another portion achieves bonding of components of the reflective waveguide without the need for an index-matched adhesive or an alignment platform for bonding. In embodiments in which one portion is overmolded to the other, the materials used to form the portions are selected such that the material used to form a first portion has a glass transition temperature (Tg) that is higher than the Tg of the material used to form a second portion. In embodiments in which one portion is overcasted to the other, the materials used to form the first portion and the second portion are thermosetting resins and are selected such that both materials have solubility parameters that approximately match each other.

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.