Ultra-high resolution scanning fiber display

• US 10,151,875 B2
• Filed: 01/15/2014
• Issued: 12/11/2018
• Est. Priority Date: 01/15/2013
• Status: Active Grant

• Current Assignee: Magic Leap, Inc.
• Original Assignee: Magic Leap, Inc.
• Inventors: Schowengerdt, Brian T., Watson, Matthew D.
• Primary Examiner(s): Kim, Ellen
• Application Number:
  US14/156,366
• Publication Number:
  US 20150268415A1
• Time in Patent Office: 1,791 Days
• Field of Search: 385 4, 385 25, 385119, 385116
• CPC Class Codes: G02B 2006/0098 for scanning
• CPC Class Codes: G02B 2027/0123 comprising devices increasing the field of view
• CPC Class Codes: G02B 2027/0147 comprising a device modifying the resolution of the displayed image
• CPC Class Codes: G02B 26/08 for controlling the direction of light in light guides G02B6/35
• CPC Class Codes: G02B 26/10 Scanning systems
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence
• CPC Class Codes: G02B 6/0008 the light being emitted at the end of the fibre
• CPC Class Codes: G02B 6/02042 Multicore optical fibres
• CPC Class Codes: G02B 6/028 with core or cladding having graded refractive index G02B6/02033, G02B6/02295 take precedence
• CPC Class Codes: G02B 6/06 the relative position of the fibres being the same at both ends, e.g. for transporting images
• CPC Class Codes: G02B 6/08 with fibre bundle in form of plate
• CPC Class Codes: G02B 6/32 having lens focusing means positioned between opposed fibre ends with lens being an integral part of the single fibre end G02B6/262
• CPC Class Codes: G02F 1/335 having an optical waveguide structure

Abstract

One embodiment is directed to a compact system for scanning electromagnetic imaging radiation, comprising a first waveguide and a second waveguide, each of which is operatively coupled to at least one electromagnetic radiation source and configured such that output from the first and second waveguides is luminance modulated and scanned along one or more axes to form at least a portion of an image.

Claims

1. A system for scanning electromagnetic imaging radiation, comprising:

a drive electronics system configured to generate at least one pixel modulation signal;

at least one electromagnetic radiation source configured to modulate light from the at least one electromagnetic radiation source based on the at least one pixel modulation signal;

a first waveguide configured to follow a first scan pattern and produce a first projected field area;

a second waveguide configured to follow a second scan pattern and produce a second projected field area; and

a first scanning actuator operatively coupled to and configured to physically displace the first waveguide along with at least one other intercoupled waveguide, and a second scanning actuator operatively coupled to and configured to physically displace the second waveguide along with at least one other intercoupled waveguide,

wherein each of the first waveguide and the second waveguide is operatively coupled to the at least one electromagnetic radiation source, and

wherein the drive electronics system is configured to luminance modulate at least one of the first waveguide or second waveguide concurrent with the first projected field area overlapping with the second projected field area.

2. The system of claim 1, wherein at least of the one of the first or second waveguides comprises an optical fiber.

3. The system of claim 2, wherein the optical fiber comprises a cladding and at least one core.

4. The system of claim 3, wherein the optical fiber comprises two or more cores occupying the same cladding.

5. The system of claim 2, wherein the optical fiber is a single-mode optical fiber.

6. The system of claim 2, wherein the optical fiber is a multi-mode optical fiber.

7. The system of claim 2, wherein the optical fiber is a step-index optical fiber.

8. The system of claim 2, wherein the optical fiber is a graded-index optical fiber.

9. The system of claim 2, wherein the optical fiber is a photonic crystal optical fiber.

10. The system of claim 1, wherein the at least one electromagnetic radiation source produces electromagnetic radiation having a wavelength in the ultraviolet to infrared range.

11. The system of claim 10, wherein the at least one electromagnetic radiation source produces visible light electromagnetic radiation.

12. The system of claim 1, wherein both the first and second waveguides are co-located within the same host medium.

13. The system of claim 1, wherein the scanning actuator comprises a piezoelectric actuation element.

14. The system of claim 1, wherein the first scanning actuator and the second scanning actuator are configured to-physically displace the first and second waveguides together.

15. The system of claim 1, wherein the first scanning actuator and the second scanning actuator are configured to physically displace the first and second waveguides independently.

16. The system of claim 1, wherein the first waveguide and at least one other intercoupled waveguide comprise a single multicore fiber.

17. The system of claim 1, wherein the output from the first and second waveguides is passed to a scanning element configured to scan said output along the one or more axes.

18. The system of claim 17, wherein the scanning element is selected from the group consisting of:

a MEMS mirror scanner, a deformable membrane mirror, a scanning prism, and a scanning lens.

19. The system of claim 1, wherein the at least one electromagnetic radiation source comprises two independent electromagnetic radiation sources, a first electromagnetic radiation source operatively coupled to the first waveguide, and a second electromagnetic radiation source operatively coupled to the second waveguide.

20. The system of claim 1, wherein the at least one electromagnetic radiation source comprises a composite source configured to inject a plurality of wavelengths of radiation into at least one of the first or second waveguides.

21. The system of claim 20, wherein the composite source is configured to inject red, green, and blue visible light radiation wavelengths.

22. The system of claim 20, wherein the composite source comprises a plurality of individual sources operatively coupled together with a combiner.

23. The system of claim 22, wherein the combiner comprises a wavelength division multiplexer.

24. The system of claim 1, wherein the at least one electromagnetic radiation source comprises a directly-modulatable emitter.

25. The system of claim 24, wherein the directly-modulatable emitter is a diode laser.

26. The system of claim 24, wherein the directly-modulatable emitter is a light-emitting diode.

27. The system of claim 1, wherein the at least one electromagnetic radiation source comprises an emitter operatively coupled to a modulator.

28. The system of claim 27, wherein the modulator is an interferometric modulator.

29. The system of claim 28, wherein the modulator is a Mach-Zehnder interferometric modulator.

30. The system of claim 27, wherein the modulator is an acousto-optical modulator.

31. The system of claim 27, wherein the modulator is a shutter.

32. The system of claim 1, wherein the output from the first and second waveguides is scanned in a spiral scan pattern.

33. The system of claim 1, wherein the image at an image plane has a diameter that is larger than a combined cross sectional geometric measurement of the first and second waveguides.

34. The system of claim 1, further comprising a plurality of additional waveguides, the first, second, and plurality of additional waveguides being arranged in a hexagonally-packed array configuration.

35. The system of claim 34, wherein image field areas associated with the outputs of each of the first, second, and plurality of additional waveguides are overlapped by a minimum amount determined by a common intersection of three equal circles.

36. The system of claim 3, wherein the at least one core comprises two or more cores, and wherein the two or more cores are arranged in a hexagonally-packed array configuration.

37. The system of claim 2, further comprising first and second lenses coupled to the first and second waveguides such that imaging radiation transmitted through the first and second waveguides is passed through the first and second lenses before being output to generate the portion of the image.

38. The system of claim 37, wherein the first and second lenses are gradient index lenses.

39. The system of claim 37, wherein the first and second lenses are refractive lenses.

40. A system for scanning electromagnetic imaging radiation, comprising:

a drive electronics system configured to generate at least one pixel modulation signal;

at least one electromagnetic radiation source configured to modulate light from the at least one electromagnetic radiation source based on the at least one pixel modulation signal;

a first waveguide configured to follow a first scan pattern and produce a first projected field area;

a second waveguide configured to follow a second scan pattern and produce a second projected field area;

a first scanning actuator operatively coupled to and configured to physically displace the first waveguide, and a second scanning actuator operatively coupled to and configured to physically displace the second waveguide, the second waveguide being intercoupled with the first waveguide,

wherein each of the first waveguide and the second waveguide is operatively coupled to the at least one electromagnetic radiation source, and

wherein the drive electronics system is configured to luminance modulate at least one of the first waveguide or second waveguide concurrent with the first projected field area overlapping with the second projected field area.