US 12,443,041 B2
Optical elements for reducing visual artifacts in diffractive waveguide displays and systems incorporating the same
Steven John Robbins, Redmond, WA (US); Michael James Escuti, Redmond, WA (US); and Jihwan Kim, Cary, NC (US)
Assigned to Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Appl. No. 18/002,768
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
PCT Filed Jun. 22, 2021, PCT No. PCT/US2021/038361
§ 371(c)(1), (2) Date Dec. 21, 2022,
PCT Pub. No. WO2021/262641, PCT Pub. Date Dec. 30, 2021.
Claims priority of provisional application 63/042,021, filed on Jun. 22, 2020.
Claims priority of provisional application 63/042,031, filed on Jun. 22, 2020.
Prior Publication US 2023/0288706 A1, Sep. 14, 2023
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01); G02F 1/01 (2006.01); G02B 5/30 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 6/0056 (2013.01); G02B 6/0076 (2013.01); G02F 1/0136 (2013.01); G02B 5/3016 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A diffractive waveguide device, comprising:
an optical waveguide;
a diffractive element optically coupled to the optical waveguide, wherein the diffractive element is configured to alter a polarization and propagation direction of light of a first polarization, and is configured to transmit light of a second polarization without substantially altering a polarization or propagation direction thereof;
a polarizing film assembly that is configured to provide the light of the second polarization to the optical waveguide, and/or is configured to block the light of the second polarization from the optical waveguide, wherein the polarizing film assembly comprises a polarizer and an optical retarder that is positioned between the polarizer and the optical waveguide; and
a spatially varying retarder configured to vary a diffraction efficiency of the diffractive element in one or more directions.