Granted Patent B2

US 12,416,807 · App. 17/820,876 · Granted Sep 16, 2025

Inventors: Ardalan Heshmati (Saratoga, CA); Hideaki Fukuzawa (Kanagawa, JP)

Assignee: TDK CORPORATION

G02B27/0172G02B26/101G02B27/0179G02B2027/0178G02B2027/0181G02B2027/0187

Abstract

Claims (57)

1. A retinal projection display system comprising:

a light source for projecting an image;

a scanning mirror having a field of view larger than the image; and

a reflective surface on which the image is projected, wherein the reflective surface is larger than the image;

wherein the scanning mirror projects the image onto a viewable region of the reflective surface such that the image is projected into a retina of a user, wherein a pupillary distance alignment is determined during a calibration operation for the user, wherein the pupillary distance alignment identifies the viewable region of the reflective surface for a known gaze direction of the user, wherein the image is displayed at multiple locations of the reflective surface during the calibration operation, and the pupillary distance alignment is determined responsive to feedback from the user identifying the viewable region of the reflective surface.

2. The retinal projection display system of claim 1 , further comprising:

a gaze tracker for tracking a gaze direction of the user, wherein the viewable region corresponds to the gaze direction;

wherein the scanning mirror is configured to dynamically move the image on the reflective surface according to the gaze direction of the user and the pupillary distance alignment of the user.

3. The retinal projection display system of claim 2 , wherein the scanning mirror is configured to dynamically move the image on the reflective surface according to the gaze direction of the user responsive to the gaze direction satisfying a movement threshold.

4. The retinal projection display system of claim 2 , wherein the scanning mirror is configured to dynamically move the image on the reflective surface according to the gaze direction of the user after a predetermined time delay.

5. The retinal projection display system of claim 2 , wherein the image is smaller than the viewable region such that scanning mirror is configured to dynamically move the image on the reflective surface according to the gaze direction of the user responsive to image moving outside of the viewable region.

6. The retinal projection display system of claim 1 , wherein the reflective surface is at least partially transparent.

7. The retinal projection display system of claim 1 , further comprising:

an eyeglasses frame configured to be worn by the user; and

at least one lens mounted in the eyeglasses frame, where the reflective surface is positioned on at least a portion of the at least one lens.

8. A retinal projection display system comprising:

a light source for projecting an image;

a scanning mirror having a field of view larger than the image; and

a reflective surface on which the image is projected, wherein the reflective surface is larger than the image;

wherein the scanning mirror projects the image onto a viewable region of the reflective surface such that the image is projected into a retina of a user, and wherein a scanning range of the scanning mirror is dynamically adjusted to correspond to a size of the image in the viewable region.

9. A retinal projection display system comprising:

a light source for projecting an image;

a scanning mirror having a field of view larger than the image; and

a reflective surface on which the image is projected, wherein the reflective surface is larger than the image;

wherein the scanning mirror projects the image onto a viewable region of the reflective surface such that the image is projected into a retina of a user, and wherein a scanning range of the scanning mirror corresponds to a size of a display area of the reflective surface, such that the light source is activated for displaying the image only when the scanning mirror is projecting the image in the viewable region.

10. A method of retinal projection, the method comprising:

projecting an image from a light source onto a reflective surface using a scanning mirror having a field of view larger than the image, wherein the reflective surface is larger than the image;

determining a viewable region of the reflective surface for a user, wherein the determining the viewable region of the reflective surface of the user comprises:

retrieving a pupillary distance alignment for the user, wherein the pupillary distance alignment identifies the viewable region of the reflective surface for a known gaze direction of the user, wherein the pupillary distance alignment is determined during a calibration operation for the user, the method further comprising:

during the calibration operation:

projecting an alignment image onto the reflective surface;

moving the alignment image across a display area of the reflective surface; and

responsive to feedback from the user, determining the pupillary distance alignment identifying the viewable region of the reflective surface for the known gaze direction of the user; and

directing the image onto the viewable region of the reflective surface such that the image is projected into a retina of the user.

11. The method of claim 10 , wherein the determining the viewable region of the reflective surface of the user further comprises:

tracking a gaze direction of the user, wherein the viewable region corresponds to the gaze direction.

12. The method of claim 11 , wherein the directing the image onto the viewable region of the reflective surface such that the image is projected into a retina of the user comprises:

dynamically moving the image on the reflective surface according to the gaze direction of the user and the pupillary distance alignment of the user using the scanning mirror.

13. The method of claim 12 , wherein the dynamically moving the image on the reflective surface according to the gaze direction of the user and the pupillary distance alignment of the user using the scanning mirror comprises:

determining an amount of movement of the gaze direction based on the tracking the gaze direction of the user; and

responsive to the amount of movement of the gaze direction satisfying a movement threshold, moving the image on the reflective surface according to the gaze direction of the user and the pupillary distance alignment of the user.

14. The method of claim 12 , wherein the dynamically moving the image on the reflective surface according to the gaze direction of the user and the pupillary distance alignment of the user using the scanning mirror comprises:

moving the image on the reflective surface according to the gaze direction of the user and the pupillary distance alignment of the user after a predetermined time delay.

15. The method of claim 12 , wherein the image is smaller than the viewable region and wherein the dynamically moving the image on the reflective surface according to the gaze direction of the user and the pupillary distance alignment of the user using the scanning mirror comprises:

determining whether the image is outside of the viewable region; and

responsive to determining that the image is outside of the viewable region, moving the image on the reflective surface according to the gaze direction of the user and the pupillary distance alignment of the user.

16. The method of claim 10 , wherein the reflective surface is at least partially transparent.

17. A method of retinal projection, the method comprising:

projecting an image from a light source onto a reflective surface using a scanning mirror having a field of view larger than the image, wherein the reflective surface is larger than the image;

determining a viewable region of the reflective surface for a user;

directing the image onto the viewable region of the reflective surface such that the image is projected into a retina of the user; and

wherein a scanning range of the scanning mirror is dynamically adjusted to correspond to a size of the image in the viewable region.

18. A method of retinal projection, the method comprising:

projecting an image from a light source onto a reflective surface using a scanning mirror having a field of view larger than the image, wherein the reflective surface is larger than the image;

determining a viewable region of the reflective surface for a user;

directing the image onto the viewable region of the reflective surface such that the image is projected into a retina of the user; and

wherein a scanning range of the scanning mirror corresponds to a size of display area of the reflective surface, such that the light source is activated for displaying the image only when the scanning mirror is projecting the image in the viewable region.

Assignments (3)

Continuity (2)

References Cited (400)