Patent ID: 11947128
Assignee: ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONA
Field: Optics (Instruments)
Classification: CPC G | IPC F  G

Claim 0:
1. A process having steps for image projection and gaze tracking, the steps comprising: a. illuminating a digital micromirror device via a light source, wherein the digital micromirror device is a micro electro mechanical system having an array of micro mirrors;
b. turning on and off the micro mirrors in a synchronous manner to the light source;
c. forming a visible image by pulse width modulation of the micro mirrors,
d. incorporating an infrared light emitting diode into the pulse width modulation
e. generating an infrared illuminating beam using the digital micromirror device, the infrared illuminating beam having a modulated angle;
f. reflecting the infrared illuminating beam off of a user's cornea;
g. tracking a user's gaze by detecting the reflection of the infrared illuminating beam off of the user's cornea using a quad detector;
h. providing a feedback signal to the digital micromirror device, wherein the feedback signal represents the overall variation of the user's gaze;
i. adjusting the angle of the infrared illuminating beam based upon the feedback signal;
j. integrating a feedback servo signal over a time; and
k. time-multiplexing the infrared illuminating beam.