US 12,392,951 B2
Optical device for augmented reality display
Gleb Siroki, Abingdon (GB); Sebastien De Cunsel, Abingdon (GB); Sumanta Talukdar, Chippenham (GB); Cheng Shi, Oxford (GB); Tom Vidar Michalsen, Reading (GB); David Poussin, London (GB); and Mohmed Salim Valera, Sutton Coldfield (GB)
Assigned to SNAP INC., Santa Monica, CA (US)
Appl. No. 18/003,827
Filed by Snap Inc., Santa Monica, CA (US)
PCT Filed Jun. 29, 2021, PCT No. PCT/EP2021/067862
§ 371(c)(1), (2) Date Dec. 29, 2022,
PCT Pub. No. WO2022/002945, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 20183455 (EP), filed on Jul. 1, 2020.
Prior Publication US 2023/0251411 A1, Aug. 10, 2023
Int. Cl. G02B 5/18 (2006.01); F21V 8/00 (2006.01); G02B 27/01 (2006.01)
CPC G02B 6/0026 (2013.01) [G02B 5/1828 (2013.01); G02B 27/0172 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical device for controlling light in an augmented reality display, the optical device comprising:
a waveguide; and
a diffractive optical element configured to couple light into the waveguide;
wherein the diffractive optical element comprises an array of structured grating elements, the structured grating elements being arranged based on a repeating unit cell, wherein each unit cell comprises at least two grating elements defining an irregular grating structure such that the diffractive optical element produces an asymmetrical diffraction response, the size of the unit cell along a repeat direction of the unit cell being less than 750 nm.