US 12,242,059 B2
Display for augmented reality
Mohmed Salim Valera, Abingdon (GB); Sebastien De Cunsel, Abingdon (GB); and Gleb Siroki, Abingdon (GB)
Assigned to Snap Inc., Santa Monica, CA (US)
Appl. No. 17/594,592
Filed by Snap Inc., Santa Monica, CA (US)
PCT Filed Mar. 23, 2020, PCT No. PCT/GB2020/050775
§ 371(c)(1), (2) Date Oct. 22, 2021,
PCT Pub. No. WO2020/217044, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 1905773 (GB), filed on Apr. 25, 2019.
Prior Publication US 2022/0197036 A1, Jun. 23, 2022
Int. Cl. G02B 27/01 (2006.01); G02B 1/00 (2006.01); G02B 27/42 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 1/005 (2013.01); G02B 27/4222 (2013.01); G02B 27/4272 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An augmented reality device, comprising:
a waveguide;
an input diffractive optical element positioned in or on the waveguide configured to receive light from a projector and to couple the light into the waveguide so that it is captured within the waveguide by total internal reflection;
an output diffractive optical element positioned in or on the waveguide configured to couple totally internally reflected light out of the waveguide towards a viewer; and
a returning diffractive optical element positioned in or on the waveguide configured to receive light from the output diffractive optical element and to diffract the received light so that it is returned toward the output diffractive optical element;
wherein the output diffractive optical element comprises first and second output diffractive optical elements overlaid on one another in or on the waveguide, wherein the first output diffractive optical element is configured to receive light from an input direction and coupled it toward the second output diffractive optical element which can then provide outcoupled orders towards a viewer, and the second output diffractive optical element is configured to receive light from an input direction and couple it towards the first output diffractive optical element which can then provide outcoupled orders towards a viewer;
wherein the returning diffractive optical element comprises first and second returning diffractive optical elements, wherein the first returning diffractive optical element is positioned to receive light from the first output diffractive optical element and to diffract the receive light so that it is returned towards the output diffractive optical element which can then provide outcoupled orders towards a viewer, and wherein the second returning diffractive optical element is positioned to receive light from the second output diffractive optical element and to diffract the received light so that it is returned towards the output diffractive optical element which can then provide outcoupled orders towards a viewer.