Distributed light manipulation over imaging waveguide

Patent metadata

Field	Value
Publication number	US-9904058-B2
Application number	US-201715591749-A
Country	US
Kind code	B2
Filing date	May 10, 2017
Priority date	May 12, 2016
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

In a stacked waveguide assembly, the waveguides can comprise color filters, distributed filters, and/or switch materials. Examples of color filters include dyes, tints, or stains. Examples of distributed filters and/or switch materials include dichroic filters, Bragg gratings, electronically switchable glass, and electronically switchable mirrors. Switch materials can be designed or tuned to attenuate light of unwanted colors or wavelengths. The waveguides may each be associated with a particular design wavelength. This can mean that a waveguide that is associated with a design wavelength includes an incoupling optical element is configured to deflect light at the design wavelength to an associated light distributing element and that the associated wavelength selective region is configured to attenuate light not at the design wavelength.

First claim

What is claimed is:

1. A stacked waveguide assembly comprising:
a first waveguide comprising:
a first layer of an incoupling optical element configured to couple light at a first wavelength into a first layer of a light distributing element, the light distributing element comprising a wavelength selective region;
a first layer of the wavelength selective region configured to receive incoupled light from the first layer of the incoupling optical element and to attenuate the incoupled light not at the first wavelength relative to incoupled light at the first wavelength,
wherein the first layer of the light distributing element is configured to couple the incoupled light at the first wavelength out of the first layer of the wavelength selective region; and
a first layer of an outcoupling optical element configured to receive the incoupled light at the first wavelength from the first layer of the light distributing element and to couple the incoupled light out of the first waveguide; and

a second waveguide comprising:
a second layer of the incoupling optical element configured to couple light at a second wavelength into a second layer of the light distributing element, the second wavelength different from the first wavelength;
a second layer of the wavelength selective region configured to receive incoupled light from the second layer of the incoupling optical element and to attenuate the incoupled light not at the second wavelength relative to incoupled light at the second wavelength,
wherein the second layer of the light distributing element is configured to couple the incoupled light at the second wavelength out of the second layer of the wavelength selective region; and
a second layer of the outcoupling optical element configured to receive the incoupled light at the second wavelength from the second layer of the light distributing element and to couple the incoupled light out of the second waveguide.

2. The stacked waveguide assembly of claim 1 , wherein the first layer of the wavelength selective region comprises a first color filter and the second layer of the wavelength selective region comprises a second color filter, the first color filter configured to attenuate light at the second wavelength, and the second color filter configured to attenuate light at the first wavelength.

3. The stacked waveguide assembly of claim 2 , wherein the first color filter or the second color filter comprises a dye, a tint, a stain, a volumetric optical filter, or a dichroic filter.

4. The stacked waveguide assembly of claim 1 , wherein the first layer of the wavelength selective region comprises a first electronically switchable region, and the second layer of the wavelength selective region comprises a second electronically switchable region.

5. The stacked waveguide assembly of claim 4 , further comprising a controller configured to electronically control the first electronically switchable region and the second electronically switchable region to modulate light in the stacked waveguide assembly.

6. The stacked waveguide assembly of claim 5 , wherein the controller is configured to switch the first electronically switchable region to modulate light in the first layer of the light distributing element and to switch the second electronically switchable region to not modulate light in the second layer of the light distributing element.

7. The stacked waveguide assembly of claim 5 , wherein the controller is configured to electronically control the first electronically switchable region and the second electronically switchable region to steer the incoupled light to expand a field of view.

8. The stacked waveguide assembly of claim 1 , wherein the first layer of the wavelength selective region is configured to alter an index of refraction of light not at the first wavelength or the second layer of the wavelength selective region is configured to alter an index of refraction of light not at the second wavelength.

9. The stacked waveguide assembly of claim 1 , wherein the first layer or the second layer of the wavelength selective region comprises a polarizer.

10. The stacked waveguide assembly of claim 1 , wherein the first wavelength is associated with a first subcolor of a color and the second wavelength is associated with a second subcolor of the color, the second subcolor different from the first subcolor.

Assignees

• Magic Leap Inc

Inventors

• Yeoh Ivan L
• Edwin Lionel E
• Macnamara John Graham

Classifications

• G02B6/34

  utilising prism or grating {(G02B6/293 takes precedence)} · CPC title

• G02B27/0172 Primary

  characterised by optical features · CPC title

• G02B6/0076

  Stacked arrangements of multiple light guides of the same or different cross-sectional area · CPC title

• G02B2027/0125

  Field-of-view increase by wavefront division · CPC title

• G02B2027/0174

  holographic · CPC title