Reflective switching device for inputting different wavelengths of light into waveguides

• US 10,571,693 B2
• Filed: 02/28/2017
• Issued: 02/25/2020
• Est. Priority Date: 03/01/2016
• Status: Active Grant

• Current Assignee: Magic Leap, Inc.
• Original Assignee: Magic Leap, Inc.
• Inventors: Tinch, David, Jones, William K.
• Primary Examiner(s): Rakowski, Cara E
• Assistant Examiner(s): Lamb, II, Christopher A
• Application Number:
  US15/445,827
• Publication Number:
  US 20170255016A1
• Time in Patent Office: 1,092 Days
• CPC Class Codes: G02B 2027/0112 comprising device for genereting colour display
• CPC Class Codes: G02B 2027/0125 Field-of-view increase by wavefront division
• CPC Class Codes: G02B 2027/0127 comprising devices increasing the depth of field
• CPC Class Codes: G02B 2027/0185 Displaying image at variable distance
• CPC Class Codes: G02B 26/0833 the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD G02B26/0825 takes precedence; micromechanical devices in general B81B
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G02B 6/005 provided by one optical element, or plurality thereof, placed on the light output side of the light guide
• CPC Class Codes: G02B 6/0076 Stacked arrangements of multiple light guides of the same or different cross-sectional area
• CPC Class Codes: G02B 6/3518 the reflective optical element being an intrinsic part of a MEMS device, i.e. fabricated together with the MEMS device MEMS devices in general B81B; manufacture of MEM devices in general B81C; micromechanical devices controlling the direction of light G02B26/0833

Abstract

Systems and methods are provided for selectively incoupling light having different wavelengths into one of a plurality of waveguides. The systems and methods provided for selectively incoupling light having different wavelengths into one of a plurality of waveguides comprise a switching device comprising switchable reflective elements that can be configured to redirect incoming light towards an incoupling element associated with one of a plurality of waveguides.

Claims

1. A display device comprising:

a first waveguide;

a first incoupling optical element configured to redirect light of a first light beam containing image information at a first wavelength from an optical source into the first waveguide, the optical source comprising a spatial light modulator;

a first microelectromechanical systems (MEMS) mirror;

a controller configured to position the first MEMS mirror such that the first MEMS mirror is disposed in a first optical path between the optical source and the first incoupling optical element to redirect the first light beam towards the first incoupling optical element;

a second waveguide;

a second incoupling optical element configured to redirect light of a second light beam containing image information at a second wavelength from the optical source into the second waveguide;

a second microelectromechanical systems (MEMS) mirror,

wherein the controller is configured to position the second MEMS mirror such that the second MEMS mirror is disposed in a second optical path between the optical source and the second incoupling optical element to redirect the second light beam towards the second incoupling optical element;

a third waveguide;

a third incoupling optical element configured to redirect light of a third light beam containing image information at a third wavelength from the optical source into the third waveguide; and

a third microelectromechanical systems (MEMS) mirror,

wherein the controller is configured to position the third MEMS mirror such that the third MEMS mirror is disposed in a third optical path between the optical source and the third incoupling optical element to redirect the third light beam towards the third incoupling optical element,

wherein the first waveguide, the second waveguide and the third waveguide are associated with a first depth plane, and wherein light from the first, second and third waveguides are configured to produce an image appearing to originate from the first depth plane;

a fourth waveguide associated with a second depth plane different from the first depth plane;

a fourth incoupling optical element associated with the fourth waveguide and configured to redirect light of the third light beam containing image information at the third wavelength from the optical source into the fourth waveguide; and

a fourth microelectromechanical systems (MEMS) mirror,

wherein the controller is configured to position the fourth MEMS mirror such that the fourth MEMS mirror is disposed in the third optical path to redirect the third light beam toward the fourth incoupling optical element.

2. The display device of claim 1, wherein the first waveguide, the second waveguide, the third waveguide, and the fourth waveguide comprise outcoupling optical elements configured to output light from the first waveguide, the second waveguide, the third waveguide, and the fourth waveguide, respectively.

3. The display device of claim 1, wherein the first waveguide, the second waveguide, the third waveguide, and fourth waveguide comprise a plurality of outcoupling optical elements configured to output light from the first waveguide, the second waveguide, the third waveguide, and the fourth waveguide, respectively.

4. The display device of claim 1, wherein the first MEMS mirror, the second MEMS mirror, the third MEMS mirror, and fourth MEMS mirror are configured to flip out of a plane of a surface parallel to a surface of the first waveguide, the second waveguide, the third waveguide, and the fourth waveguide by an angle θ

having a value between about 30 degrees and about 60 degrees.

5. The display device of claim 1, wherein the first MEMS mirror, the second MEMS mirror, the third MEMS mirror, and fourth MEMS mirror are configured to slide in and out of the first optical path, the second optical path, or the third optical path.

6. The display device of claim 1, wherein each of the first waveguide, the second waveguide, and the third waveguide comprises a forward surface and a rearward surface and a plurality of edges included between the forward surface and the rearward surface, and wherein the first incoupling optical element, the second incoupling optical element, and the third incoupling optical element are laterally displaced with respect to each other such that one of the first incoupling optical element, the second incoupling optical element, and the third incoupling optical element is closer to an edge of the plurality of edges than another of the first incoupling optical element, the second incoupling optical element, and the third incoupling optical element.

7. A display device comprising:

a first plurality of waveguides associated with a first depth plane, the first plurality of waveguides configured to produce an image appearing to originate from the first depth plane;

a first plurality of incoupling optical elements associated with the first plurality of waveguides, the first plurality of incoupling optical elements configured to direct light containing image information from an optical source comprising a spatial light modulator into the first plurality of waveguides;

a first microelectromechanical systems (MEMS) mirror; and

a controller configured to position the first MEMS mirror such that the first MEMS mirror is disposed in an optical path of light from the optical source and direct light from the light source towards an incoupling optical element of the first plurality of incoupling optical elements;

a second plurality of waveguides associated with a second depth plane, the second plurality of waveguides configured to produce an image appearing to originate from the second depth plane;

a second plurality of incoupling optical elements associated with the second plurality of waveguides, the second plurality of incoupling optical elements configured to direct light from the optical source into the second plurality of waveguides; and

a second microelectromechanical systems (MEMS) mirror,

wherein the controller is configured to position the second MEMS mirror such that the second MEMS mirror is disposed in the optical path of light from the optical source and direct light from the light source towards an incoupling optical element of the second plurality of incoupling optical elements.

8. The display device of claim 7, wherein each of the plurality of waveguides comprises a forward surface and a rearward surface and a plurality of edges included between the forward surface and the rearward surface, and wherein the first plurality of incoupling optical elements are laterally displaced with respect to each other such that one of the incoupling optical elements of the first plurality of incoupling optical elements is closer to an edge of the plurality of edges than another incoupling optical element of the first plurality of incoupling optical elements.

9. The display device of claim 7, wherein the first MEMS mirror and second MEMS mirror are configured to flip out of a plane of a surface parallel to a surface of the first plurality of waveguides and the second plurality of waveguides by an angle θ

having a value between about 30 degrees and about 60 degrees.

10. The display device of claim 7, wherein the first MEMS mirror and second MEMS mirror are configured to slide in and out of an optical path of the light from the optical source.