Binocular Display with Digital Light Path Length Modulation

• US 20200137377A1
• Filed: 12/23/2019
• Published: 04/30/2020
• Est. Priority Date: 08/12/2016
• Status: Active Grant

• Current Assignee: Avegant Corp
• Original Assignee: Avegant Corp
• Inventors: Eash, Aaron Matthew, Evans, Allan Thomas, Gross, Andrew John, Dewald, D. Scott, O'Connor, Eamon Han, Foust, Forrest, Welch, III, Warren Cornelius
• Granted Patent: US 11,480,784 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 26/08 for controlling the direction of light in light guides G02B6/35
• CPC Class Codes: G02F 1/29 for the control of the position or the direction of light beams, i.e. deflection
• CPC Class Codes: H04N 13/122 Improving the 3D impression of stereoscopic images by modifying image signal contents, e.g. by filtering or adding monoscopic depth cues H04N13/128 takes precedence
• CPC Class Codes: H04N 13/128 Adjusting depth or disparity
• CPC Class Codes: H04N 13/337 using polarisation multiplexing
• CPC Class Codes: H04N 13/339 using spatial multiplexing H04N13/337 takes precedence
• CPC Class Codes: H04N 13/344 with head-mounted left-right displays
• CPC Class Codes: H04N 13/383 for tracking with gaze detection, i.e. detecting the lines of sight of the viewer's eyes

Abstract

A near-eye display system comprising a image source, a modulation stack, and an imaging assembly. The modulation stack, in one embodiment, comprises one or more digital light path length modulators.

Claims

1. A binocular display system to display an image to a user comprising:

an illumination assembly to provide light; and

a first eye subsystem including a first modulation stack for a first eye of the user comprising a first set of one or more digital light path length modulators to adjust a light path length;

a second eye subsystem, including one of a second modulation stack for a second eye of the user comprising a second set of one or more digital light path length modulators to adjust the light path length or utilizing the first modulation stack for the second eye of the user;

a first imaging assembly to create a first plurality of image portions at a plurality of focal lengths for the first eye, from the light output by the first modulation stack;

a second imaging assembly to create a second plurality of image portions at a plurality of focal lengths for the second eye, from the light output by one of the second modulation stack or the first modulation stack;

wherein the first and second plurality of image portions together provide a correct parallax of images for a three-dimensional effect.

2. The binocular display system of claim 1, wherein the first modulation stack adjusts a focal length by altering the polarization of the light one or more times as the light passes through the first set of digital light path length modulators.

3. The binocular display system of claim 1, wherein a display difference between the first and the second plurality of image portions corrects for amblyopia, presbyopia, strabismus, and other eye problems.

4. The binocular display system of claim 1, wherein each of the first imaging assembly and the second imaging assembly provide monocular focal cues.

5. The binocular display system of claim 1, further comprising:

one or more eye tracking mechanisms to identify a vergence angle; and

the binocular display system to adjust locations of the plurality of image portions based on the vergence angle.

6. The binocular display system of claim 1, further comprising:

providing the perceived focal lengths for each eye with the first modulation stack.

7. The binocular display system of claim 1, wherein an initial adjustment corrects for a difference between the eyes of the user, and further changes are matched by adjusting for both eyes of the user to maintain continuity of content.

8. The binocular display system of claim 1, further comprising:

the illumination assembly adjusting a display difference comprising one or more of;

brightness/luminosity, magnification, focal plane, and color to compensate for a condition of the eyes of the user.

9. The binocular display system of claim 8, further comprising:

the illumination assembly adjusting the display differential over time to trigger an adjustment in the user'"'"'s perception, to improve the condition of the eyes.

10. A binocular display system to display an image to a user comprising:

a display element comprising;

a first illumination assembly,

a modulation stack including a first set of one or more digital light path length modulators to adjust a light path length, and

an imaging assembly to create a first plurality of image portions at a plurality of focal lengths for the first eye, from the light output by the first modulation stack

a second display element for a second eye of the user comprising;

a second imaging assembly to create a second plurality of image portions

at a plurality of focal lengths for the second eye;

wherein the first and second plurality of image portions together provide a correct parallax of images for a three-dimensional effect.

11. The binocular display system of claim 10, wherein the second display element utilizes one of:

a different modulation stack and a different illumination assembly;

a different modulation stack, and the illumination assembly of the first display element;

the modulation stack of the first display element and a different illumination assembly;

or

the modulation stack of the first display element and the illumination assembly of the first display element.

12. The binocular display system of claim 10, wherein the modulation stack adjusts a focal length by altering the polarization of the light one or more times as the light passes through the first set of digital light path length modulators.

13. The binocular display system of claim 10, wherein a differential between the first and the second plurality of image portions corrects for amblyopia, presbyopia, strabismus, and other eye problems.

14. The binocular display system of claim 10, wherein each of the first imaging assembly and the second imaging assembly provide monocular focal cues.

15. The binocular display system of claim 10, further comprising:

one or more eye tracking mechanisms for the first eye, and a second eye tracking mechanism for the second eye together provide binocular eye tracking, the binocular eye tracking identifying a vergence angle; and

the binocular display system to adjust locations of the plurality of image portions based on the vergence angle.

16. The binocular display system of claim 15, further comprising:

providing different adjustments, to allow for different focal cues for each eye.

17. The binocular display system of claim 10, wherein an initial adjustment corrects for a difference between the eyes of the user, and further changes are matched by adjusting for both eyes of the user to maintain continuity of content.

18. The binocular display system of claim 10, further comprising:

the illumination assembly including a digital correction system, the digital correction system adjusting a display differential comprising one or more of;

luminosity, magnification, focal plane, and color to compensate for a condition of the eyes of the user.

19. The binocular display system of claim 18, further comprising:

the digital correction system adjusting the display differential over time to trigger an adjustment in the user'"'"'s perception, to improve the condition of the eyes.

20. A binocular display system to display an image to a user comprising:

a right eye display element comprising;

a right eye illumination assembly to provide light; and

a right eye modulation stack for a right eye of the user comprising a first set of one or more digital light path length modulators to adjust a light path length;

a right eye image assembly to create a first plurality of image portions at a plurality of focal lengths for the right eye, from the light output by the right eye modulation stack; and

a left eye display element comprising;

a left eye illumination assembly to provide light; and

a left eye modulation stack for a left eye of the user comprising a first set of one or more digital light path length modulators to adjust a light path length;

a left eye image assembly to create a second plurality of image portions at a plurality of focal lengths for the left eye, from the light output by the left eye modulation stack; and

wherein one of the right eye display element or the left eye display element adjusts a display differential to accommodate a condition of an eye of the user;

wherein the first and second plurality of image portions together provide a correct parallax of images for a three-dimensional effect.