Patent ID: 9500866
Filing Date: 2016-11-22
CPC Classification: G02B,G06F

Claim Text:
1. A device for eye gaze tracking, comprising: an illumination system; a spatial light modulator, including at least one light modulating element switchable between an ON position and an OFF position; near eye display optics; camera optics; a sensor; a first light path for directing illumination light toward an eye location, the first light path extending: from the illumination system via the at least one light modulating element if switched to the ON position; and continuing from the at least one light modulating element through the near eye display optics; a second light path extending: from the eye location through the near eye display optics and via the at least one light modulating element if switched to the OFF position; and continuing from the at least one light modulating element through the camera optics to the sensor; and a third light path for directing the illumination light away from the eye location, the third light path extending: from the illumination system via the at least one light modulating element if switched to the OFF position; and continuing from the at least one light modulating element along a different angular orientation than the second light path.