OPTICAL EYE TRACKING

摘要

Methods, systems, and devices are disclosed for optical sensing and tracking of eye movement. In one aspect, a method for tracking the movement of an eye includes emitting a first modulated light and a second modulated light toward an eye of a user, wherein the first modulated light and the second modulated light have substantially the same modulation frequency, but the modulation phases of the two modulated lights are substantially opposite to each other; receiving at a photodetector module a returned light including at least a partial retroreflected light from the eye of the user based on the first and second modulated lights; and processing the output signal from the photodetector module to determine positional and dimensional parameters of the eye of the user based at least on the partial retroreflected light corresponding to the first and second modulated lights.

主权项

1. A user device having an eye-tracking feature, comprising:
a front panel including a display screen; a first group of light sources positioned at a first region of the front panel, the first group of light sources configured to emit light; a photodetector module positioned on the front panel in the vicinity of the first group of light sources for generating eye tracking signals based on retroreflected lights detected from a user's eye corresponding to the emitted light from the first group of light sources; a second group of light sources positioned at a second region of the front panel, the second group of light sources configured to emit light; wherein the photodetector module is configured to capture images of a user's eye including reflection images of the emitted light from the second group of light sources; and a processor communicatively coupled to the photodetector module, the processor configured to: process the eye tracking signals to determine eye pupil center coordinates of the user's eye; process the captured images of the user's eye to determine screen center coordinates of the display screen; and compare the determined eye pupil center coordinates and the determined screen center coordinates to determine a gaze point of the user's eye on the display screen.