US 12,189,121 B2
Ultrafast illumination for structured light based eye tracking
Youmin Wang, Bellevue, WA (US); Yatong An, Redmond, WA (US); and Gaetano Aiello, Redmond, WA (US)
Assigned to Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on Dec. 22, 2022, as Appl. No. 18/087,305.
Prior Publication US 2024/0210677 A1, Jun. 27, 2024
Int. Cl. G02B 27/00 (2006.01); G02B 26/08 (2006.01); G06F 3/01 (2006.01); G02B 27/01 (2006.01)
CPC G02B 27/0093 (2013.01) [G02B 26/0858 (2013.01); G06F 3/013 (2013.01); G02B 27/0172 (2013.01); G02B 2027/0178 (2013.01); G02B 2027/0187 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An eye tracking system, comprising:
a light source to provide a collimated light;
an ultrafast micro-electromechanical system (MEMS) reflector to project a fringe pattern on a surface of an eye by directing the collimated light;
a single-photon avalanche diode (SPAD) based sensor system to capture a reflection of the fringe pattern from the surface of the eye; and
a controller communicatively coupled to the sensor system, the controller to:
obtain three-dimensional (3D) features of the surface of the eye from the captured reflection to determine a gaze of a user based on the obtained 3D features.