Wide Field of View Substrate Guided Relay

• US 20130301014A1
• Filed: 05/09/2012
• Published: 11/14/2013
• Est. Priority Date: 05/09/2012
• Status: Active Grant

• Current Assignee: Microvision, Inc.
• Original Assignee: Microvision, Inc.
• Inventors: DeJong, Christian Dean, Duelli, Markus
• Granted Patent: US 8,721,092 B2
• Time in Patent Office: Days
• US Class Current: 353/85
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence
• CPC Class Codes: G02B 5/18 Diffraction gratings holographic optical elements G02B5/32, G03H; integrally combined with optical fibres G02B6/02057; for coupling light guides G02B6/34; integrally combined with optical integrated light guides G02B6/12; grating systems G02B27/44
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00
• CPC Class Codes: H04N 9/3129 scanning a light beam on the display screen scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161

Abstract

A substrate guided relay includes multiple output couplers and multiple light valves positioned between the substrate and the output couplers. The number of light valves may be equal to the number of output couplers, or may be more or less than the number of output couplers. The light valves may be enabled sequentially, or may be enabled based on the position of a user'"'"'s eye. The light valves may include liquid crystal material.

Claims

1. A substrate guided relay comprising:

a substrate to relay light;

a plurality of output couplers; and

a plurality of electrically operated light valves positioned between the substrate and the plurality of output couplers.

2. The substrate guided relay of claim 1 wherein each of the plurality of output couplers is aligned with a corresponding one of the plurality of electrically operated light valves.

3. The substrate guided relay of claim 1 wherein each of the plurality of output couplers is aligned with more than one of the plurality of electrically operated light valves.

4. The substrate guided relay of claim 1 wherein the plurality of output couplers are equal in number to the plurality of electrically operated light valves.

5. The substrate guided relay of claim 1 wherein the plurality of output couplers are fewer in number than the plurality of electrically operated light valves.

6. The substrate guided relay of claim 1 wherein the plurality of electrically operated light valves include liquid crystal material.

7. The substrate guided relay of claim 1 wherein the plurality of electrically operated light valves further include reflective polarizing material.

8. The substrate guided relay of claim 1 further comprising an input polarizer.

9. The substrate guided relay of claim 1 wherein the plurality of output couplers have different projection angles.

10. A display system comprising:

a substrate to relay light;

a plurality of output couplers;

a plurality of electrically operated light values coupled between the substrate and the plurality of output couplers; and

a control system to sequentially select the electrically operated light valves.

11. The display system of claim 10 wherein the plurality of output couplers have different projection angles.

12. The display system of claim 10 wherein the plurality of electrically operated light valves include liquid crystal material.

13. The display system of claim 12 further comprising a scanning laser projector coupled to project light into the substrate.

14. The display system of claim 13 wherein the scanning laser projector is configured to sequentially project different portions of an image area as the control system sequentially selects different electrically operated light valves.

15. The display system of claim 14 wherein the scanning laser projector is configured to project a different portion of the image area for each projected frame.

16. A display system comprising:

a substrate to relay light;

a plurality of output couplers;

a plurality of individually selectable light values coupled between the substrate and the plurality of output couplers; and

a control system to track a user'"'"'s eye position and to select the individually selectable light valves in response thereto.

17. The display system of claim 16 further comprising a scanning laser projector coupled to project light into the substrate.

19. The display system of claim 16 wherein the plurality of output couplers have different projection angles.

20. The display system of claim 16 wherein the plurality of electrically operated light valves include liquid crystal material.

18. The display system of 17 wherein the scanning laser projector is coupled to be responsive to the control system to modify a projected image based on eye position.