Patent ID: 9552064
Date: 2017-01-24
CPC Classifications: G06F,G06K

Claim:
1. A device for eye-tracking, the device comprising: a photodetector module; two groups of light sources disposed on the device at respective locations relative to a location of the photodetector module, each group of light sources configured to emit a modulated light; wherein the respective modulated lights emitted by the two groups of light sources are modulated at a substantially same modulation frequency and out of phase with each other; responsive to emitting the modulated lights by the two groups of light sources, the photodetector module is configured to receive a return light including at least a partial retroreflected light from an eye of the user; and a processor in communication with the photodetector module and the two groups of light sources, the processor is configured to process an output signal from the photodetector module to determine positional and dimensional parameters of the eye of the user based at least on the received partial retroreflected light.