Collimating fiber scanner design with inward pointing angles in virtual/augmented reality system

• US 10,254,536 B2
• Filed: 07/19/2016
• Issued: 04/09/2019
• Est. Priority Date: 07/20/2015
• Status: Active Grant

• Current Assignee: Magic Leap, Inc.
• Original Assignee: Magic Leap, Inc.
• Inventors: Yeoh, Ivan L., Edwin, Lionel Ernest, Schuelke, Aaron Mark
• Primary Examiner(s): Kianni, Kaveh C
• Assistant Examiner(s): Lam, Hung
• Application Number:
  US15/214,319
• Publication Number:
  US 20170038579A1
• Time in Patent Office: 994 Days
• Field of Search: 385 25, 385 34- 37, 385 49, 385 50, 385129-132
• CPC Class Codes: A63F 13/53 involving additional visual information provided to the game scene, e.g. by overlay to simulate a head-up display [HUD] or displaying a laser sight in a shooting game
• CPC Class Codes: G02B 2027/0125 Field-of-view increase by wavefront division
• CPC Class Codes: G02B 2027/0138 comprising image capture systems, e.g. camera
• CPC Class Codes: G02B 2027/0178 Eyeglass type eyeglass details G02C
• CPC Class Codes: G02B 2027/0181 Adaptation to the pilot/driver
• CPC Class Codes: G02B 26/103 having movable or deformable optical fibres, light guides or waveguides as scanning elements light guides per se G02B6/00
• CPC Class Codes: G02B 27/0093 with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking
• CPC Class Codes: G02B 27/01 Head-up displays
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G02B 6/0016 Grooves, prisms, gratings, scattering particles or rough surfaces
• CPC Class Codes: G02B 6/0023 provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
• CPC Class Codes: G02B 6/0028 Light guide, e.g. taper
• CPC Class Codes: G02B 6/003 Lens or lenticular sheet or layer
• CPC Class Codes: G02B 6/0076 Stacked arrangements of multiple light guides of the same or different cross-sectional area
• CPC Class Codes: G02B 6/10 of the optical waveguide type G02B6/02, G02B6/24 take precedence; devices or arrangements for the control of light by electric, magnetic, electro-magnetic or acoustic means G02F1/00; transferring the modulation of modulated light G02F2/00; optical logic elements G02F3/00; optical analogue/digital converters G02F7/00
• CPC Class Codes: G06T 1/20 Processor architectures; Processor configuration, e.g. pipelining
• CPC Class Codes: G06T 19/006 Mixed reality object pose determination, tracking or camera calibration for mixed reality G06T7/00

Abstract

A display subsystem for a virtual image generation system. The display subsystem comprises a planar waveguide apparatus, and an optical fiber having a distal tip affixed relative to the planar waveguide apparatus, and an aperture proximal to the distal tip. The display subsystem further comprises at least one light source coupled the optical fiber and configured for emitting light from the aperture of the optical fiber, and a mechanical drive assembly to which the optical fiber is mounted to the drive assembly. The mechanical drive assembly is configured for displacing the aperture of the optical fiber in accordance with a scan pattern. The display subsystem further comprises an optical waveguide input apparatus configured for directing the light from the aperture of the optical fiber down the planar waveguide apparatus, such that the planar waveguide apparatus displays one or more image frames to the end user.

Claims

1. A display subsystem for a virtual image generation system for use by an end user, comprising:

a planar waveguide apparatus;

an optical fiber having a distal tip affixed relative to the planar waveguide apparatus, and an aperture proximal to the distal tip;

at least one light source coupled the optical fiber and configured for emitting light from the aperture of the optical fiber;

a mechanical drive assembly to which the optical fiber is mounted to the drive assembly, the mechanical drive assembly configured for displacing the aperture of the optical fiber in accordance with a scan pattern;

an optical waveguide input apparatus configured for directing the light from the aperture of the optical fiber down the planar waveguide apparatus, such that the planar waveguide apparatus displays one or more image frames to the end user.

2. The display subsystem of claim 1, wherein the distal tip of the optical fiber is mounted to the planar waveguide apparatus.

3. The display subsystem of claim 1, further comprising a collimation element configured for collimating light from the optical fiber, wherein the optical waveguide input apparatus is configured for directing the collimated light from the collimation element down the planar waveguide apparatus.

4. The display subsystem of claim 3, wherein the collimation element is mounted on the aperture of the optical fiber.

5. The display subsystem of claim 4, wherein the collimation element is a lens.

6. The display subsystem of claim 5, wherein the lens is a microlens.

7. The display subsystem of claim 3, wherein the collimation element is mounted to the planar waveguide apparatus.

8. The display subsystem of claim 1, wherein the light emitted from the aperture of the optical fiber converges inward to a smaller area.

9. The display subsystem of claim 1, wherein the light emitted from the aperture of the optical fiber converges inward to a focal point.

10. The display subsystem of claim 8, wherein the smaller area is located within the optical waveguide input apparatus.

11. The display subsystem of claim 1, wherein the mechanical drive assembly comprises a piezoelectric element to which the optical fiber is mounted, and drive electronics configured for conveying electrical signals to the piezoelectric element, thereby causing the optical fiber to vibrate in accordance with the scan pattern.

12. The display subsystem of claim 11, wherein the optical fiber is vibrated in a first order vibration mode.

13. The display subsystem of claim 1, wherein the planar waveguide apparatus comprises a plurality of planar waveguides configured for respectively displaying the one or more image frames at different focal points to the end user, and the optical waveguide input apparatus is configured for directing the light from the optical modulation apparatus down the plurality of planar waveguides.

14. The display subsystem of claim 13, wherein the optical waveguide input apparatus comprises a plurality of diffractive optical elements respectively extending parallel along the planar waveguides, the plurality of diffractive optical elements respectively directing the light from the optical modulation apparatus down the planar waveguides.

15. The display subsystem of claim 13, wherein the optical waveguide input apparatus comprises a distribution waveguide extending perpendicularly to the planar waveguides, the distribution waveguide comprising a plurality of diffractive optical elements that respectively direct the light from the optical modulation apparatus down the planar waveguides.

16. The display subsystem of claim 1, wherein the planar waveguide apparatus is configured for being positioned in front of the eyes of the end user.

17. The display subsystem of claim 1, wherein the planar waveguide apparatus has a partially transparent display surface configured for being positioned in the field of view between the eyes of the end user and an ambient environment.

18. The display subsystem of claim 1, further comprising a frame structure configured for being worn by the end user, the frame structure carrying the planar waveguide apparatus.

19. A virtual image generation system for use by an end user, comprising:

memory storing a three-dimensional scene;

a control subsystem configured for rendering a plurality of synthetic image frames of the three-dimensional scene; and

the display subsystem of claim 1, the display subsystem configured for sequentially displaying the plurality of image frames to the end user.

20. The virtual image generation system of claim 19, wherein the control subsystem comprises a graphics processing unit (GPU).