公开(公告)号：US20240231100A9

公开(公告)日：2024-07-11

申请号：US18372222

申请日：2023-09-25

Applicant: GOOGLE LLC

Inventor： Wei Jin ,  Joseph Daniel Lowney ,  Lu Tian ,  Qinglan Huang ,  Thomas Mercier

IPC: G02B27/01 ,  G02B6/34

CPC classification number: G02B27/0172 ,  G02B6/34 ,  G02B2027/0178

Abstract: An augmented-reality (AR) eyewear display utilizes an optical waveguide having multi-layered optical gratings in a repeating arrangement. The optical gratings include varying depths, slope angles, lengths, and/or widths in order to tune the gratings to provide an improved AR eyewear display. By using the different configurations of two-dimensional or three-dimensional gratings disclosed herein in a waveguide of an AR eyewear display, optical characteristics of the waveguide are optimized to provide, e.g., high resolution and/or contrast, high display uniformity, high input coupling efficiency, and/or high output coupling efficiency. Accordingly, in some embodiments, aspects of the present disclosure enable lower-power AR eyewear displays to produce the same quality of display of a higher-power conventional AR eyewear display waveguide.

公开(公告)号：US20240168207A1

公开(公告)日：2024-05-23

申请号：US18489397

申请日：2023-10-18

Applicant: GOOGLE LLC

Inventor： Lu Tian ,  Wei Jin ,  Thomas Mercier

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

CPC classification number: G02B5/1857 ,  G02B6/0065 ,  G02B27/0172 ,  G02B2027/0178

Abstract: A method for fabricating a working stamp for forming slanted surface gratings in a waveguide workpiece includes providing a master workpiece comprising a substrate and performing a sequence of photoresist deposition processes, grayscale lithography processes, and etching processes on the master workpiece so as to form an imprint replication master having a pattern of slanted gratings in a working surface of its substrate, the slanted gratings having sidewalls that are not substantially orthogonal to a working surface of the substrate. The method also includes conforming a soft stamp material layer to the working surface of the imprint replication master so that the soft stamp material layer has a pattern of slanted protrusions corresponding to the pattern of slanted gratings, and removing the imprint replication master from the soft stamp material and curing the soft stamp material layer surrounding the pattern of slanted protrusions to form the working stamp.