US 12,216,282 B2
Waveguide display with gaze tracking
Francesco Aieta, Alameda, CA (US); Byron R. Cocilovo, Boulder, CO (US); Jonathan B. Pfeiffer, Lafayette, CO (US); and Se Baek Oh, Hillsborough, CA (US)
Appl. No. 18/262,902
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Feb. 4, 2022, PCT No. PCT/US2022/015344
§ 371(c)(1), (2) Date Jul. 25, 2023,
PCT Pub. No. WO2022/173671, PCT Pub. Date Aug. 18, 2022.
Claims priority of provisional application 63/148,496, filed on Feb. 11, 2021.
Prior Publication US 2024/0103273 A1, Mar. 28, 2024
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01); G02B 5/32 (2006.01); G02B 27/00 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 5/32 (2013.01); G02B 6/0016 (2013.01); G02B 6/0036 (2013.01); G02B 27/0093 (2013.01); G02B 2027/0138 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A display system comprising:
a waveguide configured to direct image light having a visible wavelength;
a light source configured to generate infrared light;
a surface relief grating on the waveguide;
an output coupler on the waveguide and configured to couple the image light out of the waveguide, wherein the surface relief grating is configured to diffract the image light towards the output coupler and is configured to diffract the infrared light onto an output angle that is outside a total internal reflection (TIR) range of the waveguide; and
control circuitry configured to perform gaze tracking operations based at least in part on the infrared light diffracted by the surface relief grating.