US 11,988,828 B1
Multi-pupil display and eye-tracking with interferometric sensing
Mohamed Tarek Ahmed El-Haddad, Redmond, WA (US); and Francesco LaRocca, Kirkland, WA (US)
Assigned to META PLATFORMS TECHNOLOGIES, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on Nov. 16, 2022, as Appl. No. 17/988,649.
Int. Cl. G02B 27/00 (2006.01); G02B 27/01 (2006.01)
CPC G02B 27/0093 (2013.01) [G02B 27/0172 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An eye-tracking system, comprising:
a light source to emit infrared (IR) light;
a waveguide comprising an input coupler;
a scanner to direct the infrared (IR) light from the light source to the input coupler, wherein
the scanner is to direct visible light to the input coupler, and
the input coupler is to direct the infrared (IR) light to exit the waveguide toward an eyebox region for eye-tracking and the visible light toward to the eyebox region for display as a virtual image; and
a sensor to generate an imaging signal when the infrared (IR) light impinges upon the sensor via the scanner and the input coupler.