公开(公告)号：US20230077228A1

公开(公告)日：2023-03-09

申请号：US17884510

申请日：2022-08-09

Applicant: Meta Platforms Technologies, LLC

Inventor： Ganghun KIM ,  Andrew MAIMONE ,  Alexander Jobe FIX ,  Robert Dale CAVIN ,  Hee Yoon LEE ,  Matthieu Charles Raoul LEIBOVICI ,  Brian WHEELWRIGHT ,  Douglas Robert Lanman

IPC: G02B27/01 ,  G06T7/73 ,  G03H1/04 ,  A01N43/50 ,  A01N43/54 ,  A01N43/90 ,  A01N53/00 ,  C07D401/04 ,  C07D401/14 ,  C07D405/14 ,  C07D487/04 ,  C07D498/04

Abstract: A system for making a holographic medium for use in generating light patterns for eye tracking includes a light source configured to provide light and a beam splitter configured to separate the light into a first portion of the light and a second portion of the light that is spatially separated from the first portion of the light. The system also includes a first set of optical elements configured to transmit the first portion of the light for providing a first wide-field beam onto an optically recordable medium and one or more diffractive optical elements configured to receive the second portion of the light and project a plurality of separate light patterns onto the optically recordable medium for forming the holographic medium.

公开(公告)号：US20250093560A1

公开(公告)日：2025-03-20

申请号：US18825830

申请日：2024-09-05

Applicant: Meta Platforms Technologies, LLC

Inventor： Richard FARRELL ,  Hee Yoon LEE ,  Vivek GUPTA

IPC: G02B5/18 ,  F21V8/00 ,  G02B6/12 ,  G02B6/122 ,  G02B6/124 ,  G02B6/132 ,  G02B27/00 ,  G02B27/01 ,  G02B27/42

Abstract: A method of fabricating a layered waveguide display comprises imprinting a surface-relief grating (SRG) on a first substrate, filling grating grooves of the SRG with a backfill material, depositing a first layer of an index-matching material on the SRG, and bonding the first layer of the index-matching material on the SRG to a first side of a second substrate. The first substrate and the SRG are characterized by a first refractive index and a second refractive index, respectively. The backfill material is characterized by a third refractive index greater than the first refractive index and the second refractive index. The index-matching material is characterized by a fourth refractive index greater than the first refractive index and the second refractive index. In some embodiments, the backfill material is the same as the index-matching material. The second substrate is characterized by a fifth refractive index matching the fourth refractive index.