US 12,136,291 B2
Systems and methods for facial expression tracking
Manoj Bikumandla, Union City, CA (US); and Chao Han, San Ramon, CA (US)
Assigned to Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on Oct. 10, 2022, as Appl. No. 17/962,975.
Application 17/962,975 is a continuation of application No. 16/746,226, filed on Jan. 17, 2020, granted, now 11,467,659.
Prior Publication US 2023/0147801 A1, May 11, 2023
Int. Cl. G06F 3/01 (2006.01); G01S 17/89 (2020.01); G06V 10/145 (2022.01); G06V 40/16 (2022.01)
CPC G06V 40/166 (2022.01) [G01S 17/89 (2013.01); G06F 3/012 (2013.01); G06V 10/145 (2022.01); G06V 40/174 (2022.01)] 20 Claims
OG exemplary drawing
 
1. A head wearable display (HWD) comprising:
an element configured to be worn on a head of a user;
an illuminator disposed with the element and configured to emit light toward at least a portion of the head;
a plurality of photon detectors disposed with the element and configured to receive light reflected from at least a second portion of the head;
a winner take all circuit configured to have a branch for each of the plurality of photon detectors and via which to receive electric signals from each of the plurality of photon detectors
and provide a signal identifying which photon detector of the plurality of photon detectors has a higher electrical signal; and
one or more processors coupled to a non-transitory computer-readable storage medium having instructions encoded thereon that, when executed by the one or more processors, cause
the one or more processors to:
determine a facial expression of the user based at least on the information derived from the higher electrical signal provided by the identified photon detector of the winner take all circuit.