Meta Platforms, Inc.
Immersed hot mirrors for illumination in eye tracking

Abstract:

Disclosed herein are techniques for eye illumination for eye position tracking. An illuminator for eye illumination includes a light source, a substrate configured to be placed in front of an eye of a user, and at least one reflector located within the substrate. The light source is configured to emit light in a first wavelength range to illuminate the at least one reflector. The at least one reflector is configured to reflect the light in the first wavelength range to the eye of the user, and transmit light in a second wavelength range different from the first wavelength range. The substrate is transparent to both the light in the first wavelength range and the light in the second wavelength range.