Display alignment tracking in display systems

Patent metadata

Field	Value
Publication number	US-10488653-B2
Application number	US-201715816770-A
Country	US
Kind code	B2
Filing date	Nov 17, 2017
Priority date	Nov 17, 2017
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

Devices, systems, and methods corresponding to addressing misalignment in display systems are provided. A method includes using a first microelectromechanical system (MEMS) mirror, directing a first signal from a first light source to an alignment tracking waveguide. The method further includes receiving by a first photosensor a first portion of the first signal via the alignment tracking waveguide and determining a first alignment indicator associated with the first portion of the first signal. The method further includes using a second MEMS mirror, directing a second signal from a second light source to the alignment tracking waveguide. The method further includes receiving by a second photosensor a second portion of the second signal via the alignment tracking waveguide and determining a second alignment indicator associated with the second portion of the second signal.

First claim

What is claimed:

1. A method in a device comprising a controller, a first light source, and a second light source, the method comprising:
using a first microelectromechanical system (MEMS) mirror, directing a first signal from the first light source to an alignment tracking waveguide;
receiving by a first photosensor a first portion of the first signal via the alignment tracking waveguide and using the controller determining a first alignment indicator associated with the first portion of the first signal based on a first angle of incidence of the first portion of the first signal on a first surface;
using a second MEMS mirror, directing a second signal from the second light source to the alignment tracking waveguide; and
receiving by a second photosensor a second portion of the second signal via the alignment tracking waveguide and using the controller determining a second alignment indicator associated with the second portion of the second signal based on a second angle of incidence of the second portion of the second signal on a second surface.

2. The method of claim 1 , wherein the first surface is associated with the first photosensor, and wherein the second surface is associated with the second photosensor.

3. The method of claim 1 further comprising comparing the first alignment indicator to a first predetermined alignment reference indicator to generate a first alignment adjustment value and comparing the second alignment reference indicator to a second predetermined reference indicator to generate a second alignment adjustment value.

4. The method of claim 3 further comprising adjusting a rendering of the first signal based on the first alignment adjustment value and adjusting a rendering of the second signal based on the second alignment adjustment value.

5. The method of claim 1 , wherein the first alignment indicator is determined based at least on a direction of the first signal after it is directed by the first MEMS mirror, and wherein the second alignment indicator is determined based at least on a direction of the second signal after it is directed by the second MEMS mirror.

6. The method of claim 3 further comprising at least partially compensating for any misalignment between a rendering of the first signal and a rendering of the second signal based on the first alignment adjustment value and the second alignment adjustment value.

7. The method of claim 1 , wherein each of the first MEMS mirror and the second MEMS mirror comprises a scanning mirror.

8. A device comprising:
an alignment tracking waveguide;
a first display module assembly (DMA) comprising a first light source and a first microelectromechanical system (MEMS) mirror configured to direct a first signal from the first light source to the alignment tracking waveguide;
a second DMA comprising a second light source and a second MEMS mirror configured to direct a second signal from the second light source to the alignment tracking waveguide;
a first photosensor configured to receive a first portion of the first signal via the alignment tracking waveguide;
a second photosensor configured to receive a second portion of the second signal via the alignment tracking waveguide; and
a controller configured to determine a first alignment indicator associated with the first portion of the first signal based on a first angle of incidence of the first portion of the first signal on a first surface and a second alignment indicator associated with the second portion of the second signal based on a second angle of incidence of the second portion of the second signal on a second surface.

9. The device of claim 8 , wherein the first surface is associated with the first photosensor, and wherein the second surface is associated with the second photosensor.

10. The device of claim 8 , wherein the controller is further configured to compare the first alignment indicator to a first predetermined alignment reference indicator to generate a first alignment adjustment value and compare the second alignment reference indicator to a second predetermined reference indicator to generate a second alignment adjustment value.

11. The device of claim 10 , wherein the controller is further configured to adjust a rendering of the first signal based on the first alignment adjustment value and adjust a rendering of the second signal based on the second alignment adjustment value.

12. The device of claim 8 , wherein the first alignment indicator is determined based at least on a direction of the first signal after it is directed by the first MEMS mirror, and wherein the second alignment indicator is determined based at least on a direction of the second signal after it is directed by the second MEMS mirror.

13. The device of claim 10 , wherein the controller is further configured to at least partially compensate for any misalignment between a rendering of the first signal and a rendering of the second signal based on the first alignment adjustment value and the second alignment adjustment value.

14. The device of claim 8 , wherein each of the first MEMS mirror and the second MEMS mirror comprises a scanning mirror.

15. A method in a device comprising a controller, a first light source, and a second light source, the method comprising:
using a first microelectromechanical system (MEMS) mirror, scanning a first signal received from the first light source;
using a first diffraction optical element (DOE) coupling the first signal to a first display waveguide to generate a first reflected signal;
using a second DOE coupling the first reflected signal received via the first display waveguide to an alignment tracking waveguide;
receiving by a first photosensor a first portion of the first reflected signal via the alignment tracking waveguide and using the controller determining a first alignment indicator associated with the first portion of the first reflected signal based on a first angle of incidence of the first portion of the first reflected signal on a first surface;
using a second MEMS mirror, scanning a second signal received from the second light source;
using a third DOE coupling the second signal to a second display waveguide to generate a second reflected signal;
using a fourth DOE coupling the second reflected signal received via the second display waveguide to the alignment tracking waveguide; and
receiving by a second photosensor a second portion of the second reflected signal via the alignment tracking waveguide and using the controller determining a second alignment indicator associated with the second portion of the second reflected signal based on a second angle of incidence of the second portion of the second reflected signal on a second surface.

16. The method of claim 15 , wherein the first surface is associated with the first photosensor, and wherein the second surface is associated with the second photosensor.

17. The method of claim 15 further comprising comparing the first alignment indicator to a first predetermined alignment reference indicator to generate a first alignment adjustment value and comparing the second alignment reference indicator to a second predetermined reference indicator to generate a second alignment adjustment value.

18. The method of claim 17 further comprising adjusting a rendering of the first signal based on the first alignment adjustment value and adjusting a rendering of the second signal based on the second alignment adjustment value.

19. The method of claim 15 , wherein the first alignment indicator is determined based at least on a di

Assignees

• Microsoft Technology Licensing Llc

Inventors

• Wall Richard A
• Reshidko Dmitry
• Lowney Joseph
• James Richard A
• Robbins Steven J

Classifications

• G02B2027/0178

  Eyeglass type (eyeglass details G02C) · CPC title

• G02B27/0093

  with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking · CPC title

• G02B26/101

  with both horizontal and vertical deflecting means, e.g. raster or XY scanners (colour television using laser beams scanning a display screen H04N9/3129) · CPC title

• G02B26/105

  with one or more pivoting mirrors or galvano-mirrors (G02B26/101 takes precedence) · CPC title

• G02B26/085

  the reflecting means being moved or deformed by electromagnetic means · CPC title