COMPACT EYE-TRACKED HEAD-MOUNTED DISPLAY

• US 20140361957A1
• Filed: 01/24/2013
• Published: 12/11/2014
• Est. Priority Date: 01/24/2012
• Status: Active Grant

• Current Assignee: Augmented Vision, Inc., Arizona Board of Regents (University of Arizona)
• Original Assignee: Arizona Board of Regents (University of Arizona)
• Inventors: Hua, Hong, Gao, Chunyu
• Granted Patent: US 9,720,232 B2
• Time in Patent Office: Days
• US Class Current: 345/8
• CPC Class Codes: G02B 17/086 wherein the system is made of a single block of optical material, e.g. solid catadioptric systems
• CPC Class Codes: G02B 17/0896 with variable magnification or multiple imaging planes, including multispectral systems systems with only refractive elements G02B15/14
• CPC Class Codes: G02B 2027/011 comprising device for correcting geometrical aberrations, distortion
• CPC Class Codes: G02B 2027/0138 comprising image capture systems, e.g. camera
• CPC Class Codes: G02B 2027/0187 slaved to motion of at least a part of the body of the user, e.g. head, eye
• CPC Class Codes: G02B 27/0093 with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking
• CPC Class Codes: G02B 27/017 Head mounted
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G02B 5/04 Prisms
• CPC Class Codes: G06F 3/013 Eye tracking input arrangements G06F3/015 takes precedence

Abstract

Eye-tracked head-mounted displays are provide which, in one aspect, may utilize the same optics for eyetracking and image viewing, with a selected portion of the optics used for an eyetracking optical path and a selected portion of the display optics used for an image viewing optical path.

Claims

1. An eye-tracked head-mounted display, comprising:

a micro-display for generating an image to be viewed by a user, the micro-display having a display optical path and an exit pupil associated therewith;

a first plane located at the micro-display and a second plane located at the exit pupil;

an image sensor configured to receive reflected optical radiation from the second plane reflected from a user'"'"'s eye, the image sensor having a sensor optical path associated therewith; and

display optics disposed in optical communication with the micro-display along the display optical path and in optical communication with the image sensor along the sensor optical path, the display optics having a selected surface closest to the micro-display and the image sensor, the display optics located relative to the micro-display and image sensor such that the display and image sensor optical paths impinge upon differing respective portions of the selected surface.

2. The eye-tracked head-mounted display according to claim 1, wherein the display and image sensor optical paths partially overlap at the selected surface.

3. The eye-tracked head-mounted display according to claim 1, wherein the display optics is configured to create a virtual image of the micro-display for viewing at the second plane.

4. The eye-tracked head-mounted display according to claim 1, wherein the display optical path and sensor optical path each comprise respective optical axes at the micro-display and image sensor, respectively, and wherein the optical axes are coaxial.

5. The eye-tracked head-mounted display according to claim 1, wherein the display optical path and sensor optical path each comprise respective optical axes at the display optics and image sensor, respectively, and wherein the optical axes are tilted relative to one another at the second plane.

6. The eye-tracked head-mounted display according to claim 1, wherein the display optical path comprises an optical axis, and wherein the image sensor is located off the optical axis of the display optical path.

7. The eye-tracked head-mounted display according to claim 1, wherein the display optical path comprises an optical axis, and wherein the micro-display is located on the optical axis of the display optical path.

8. The eye-tracked head-mounted display according to claim 1, comprising a stop at the first plane, the stop having at least one aperture therein disposed at a location along the sensor optical path.

9. The eye-tracked head-mounted display according to claim 1, comprising a stop having at least one aperture therein disposed at a location along the sensor optical path between the sensor and selected surface.

10. The eye-tracked head-mounted display according to claim 8, wherein the at least one aperture comprises a pin-hole.

11. The eye-tracked head-mounted display according to claim 1, wherein the display optics comprises a freeform optical element.

12. The eye-tracked head-mounted display according to claim 1, wherein the display optics comprises a rotationally symmetric optical element.

13. The eye-tracked head-mounted display according to claim 1, wherein the display optics comprises a freeform optical prism.

14. The eye-tracked head-mounted display according to claim 13, wherein the prism comprises a wedge-shaped prism.

15. The eye-tracked head-mounted display according to claim 13, wherein the prism comprises an aspheric surface.

16. The eye-tracked head-mounted display according to claim 13, wherein the prism is telecentric in display space.

17. The eye-tracked head-mounted display according to claim 13, wherein the prism is non-telecentric in display space.

18. The eye-tracked head-mounted display according to claim 13, wherein the prism comprises a TIR (total internal reflection) surface oriented to receive and totally internally reflect light from the micro-display.

19. The eye-tracked head-mounted display according to claim 13, wherein the prism comprises a TIR (total internal reflection) surface oriented to totally internally reflect light to the image sensor.

20. The eye-tracked head-mounted display according to claim 13, comprising a freeform corrective lens in optical communication with the prism.

21. The eye-tracked head-mounted display according to claim 20, wherein field of view of the corrective lens is larger than a field of view of the display optics.

22. The eye-tracked head-mounted display according to claim 1, wherein the display optics comprise a half-mirrored surface.

23. The eye-tracked head-mounted display according to claim 1, comprising an illumination source for generating optical radiation and configured to illuminate the second plane to effect illumination of the user'"'"'s eye, the illumination source having an illumination optical path associated therewith.

24. The eye-tracked head-mounted display according to claim 23, wherein the display optics is disposed in optical communication with the illumination source along the illumination optical path.

25. The eye-tracked head-mounted display according to claim 23, wherein the display optics is configured to receive radiation from the illumination source and transmit the radiation to the second plane.

26. The eye-tracked head-mounted display according to claim 23, wherein the illumination source is located proximate the first plane.

27. The eye-tracked head-mounted display according to claim 23, wherein the illumination source comprises a plurality of light emitting diodes.

28. The eye-tracked head-mounted display according to claim 23, wherein the display optics is configured to collimate the optical radiation from the illumination source.

29. The eye-tracked head-mounted display according to claim 23, wherein the display optical path of the display optics comprises an optical axis and the illumination source is located off the optical axis.

30. The eye-tracked head-mounted display according to claim 23, wherein the prism comprises a TIR (total internal reflection) surface oriented to receive and totally internally reflect radiation from the illumination source.