STRAY LIGHT REDUCTION IN EYE/FACE TRACKING SYSTEMS

Abstract: systems, methods, and apparatuses to reduce stray light in eye/face tracking systems of near-eye devices are presented. in one aspect, an ir filter may minimize stray light when suitably disposed in-frame, in-lens (as, e.g., a localized in-lens ir filter), and/or coupled to a waveguide. in another aspect, configurations of linearly-polarized ir light sources and polarization-sensitive ir light sensors may be effective for stray light reduction in eye/face tracking systems. in yet another aspect, polarization-sensitive pre-processing methods and/or stray light reduction methods may be beneficial for eye/face tracking systems in near-eye devices. in an example, a near-eye ar/vr device includes a display screen to display ar/vr content through an optical stack, which includes a light source to project linearly-polarized ir light onto the user's eye, and a polarization-sensitive ir light sensor filters received ir light using polarization to separate out stray light from the linearly-polarized eye/face tracking light.

Inventor(s): Mantas Zurauskas, Robert Dale Cavin

CPC Classification: H04N23/72 (PICTORIAL COMMUNICATION, e.g. TELEVISION)

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