US 11,914,162 B1
Display devices with wavelength-dependent reflectors for eye tracking
Evan Mark Richards, Phoenix, AZ (US); and Cina Hazegh, Lafayette, CA (US)
Assigned to META PLATFORMS TECHNOLOGIES, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on Aug. 9, 2022, as Appl. No. 17/884,512.
Application 17/884,512 is a continuation of application No. 17/246,347, filed on Apr. 30, 2021, granted, now 11,409,116.
Application 17/246,347 is a continuation of application No. 16/785,249, filed on Feb. 7, 2020, granted, now 11,022,809, issued on Jun. 1, 2021.
Claims priority of provisional application 62/804,179, filed on Feb. 11, 2019.
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 3/01 (2006.01); G02B 27/01 (2006.01)
CPC G02B 27/0179 (2013.01) [G02B 27/0172 (2013.01); G06F 3/013 (2013.01); G02B 2027/0187 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An eye-tracking system, comprising:
a first mirror;
a second mirror optically coupled with the first mirror, wherein:
the first mirror is positioned to:
transmit first light reflected off an eye of a user toward the second mirror, the first light received by the first mirror at a first incident angle; and
reflect the first light received by the first mirror, reflected from the second mirror, at a second incident angle that is greater than the first incident angle; and
the second mirror is inclined at an acute angle from the first mirror so that the first light transmitted through the first mirror is reflected by the second mirror toward the first mirror at a first reflection angle, and the first light reflected by the second mirror is reflected by the first mirror toward the second mirror at a second reflection angle that is greater than the first reflection angle; and
one or more sensors positioned to detect the first light reflected by the first mirror and the second mirror for determining a gaze direction of the eye of the user.