Wide angle waveguide display

Patent metadata

Field	Value
Publication number	US-12140764-B2
Application number	US-202318328535-A
Country	US
Kind code	B2
Filing date	Jun 2, 2023
Priority date	Feb 15, 2019
Publication date	Nov 12, 2024
Grant date	Nov 12, 2024

Abstract

Disclosed herein are systems and methods for providing waveguide display devices utilizing overlapping integrated dual axis (IDA) waveguides. One embodiment includes a waveguide display device including: a first input image source providing first image light; a second input image source provide second image light; a first IDA waveguide; and a second IDA waveguide. The first IDA waveguide and the second IDA waveguide may include an overlapping region where a first two-dimensionally expanded first image light, a second two-dimensionally expanded first image light, a first two-dimensionally expanded second image light, and a second two-dimensionally expanded second image light is ejected towards an eyebox. Advantageously, resolution may be enhanced and field of view may be expanded through the use of overlapping IDA waveguides.

First claim

What is claimed is:

1. A waveguide display device comprising:
a first input image source providing first image light;
a second input image source providing second image light;
a first IDA waveguide comprising:
an input coupler for incoupling the first image light into a TIR path in the first IDA waveguide via a first pupil;
a first grating with a first K-vector; and
a second grating with a second K-vector different than the first K-vector and sharing a multiplexed region with the first grating,
wherein the first grating and the second grating together provide two-dimensional beam expansion to the first image light, and
wherein the portions of the first grating and the second grating sharing the multiplexed region together extract the two-dimensionally expanded first image light towards an eyebox; and

a second IDA waveguide comprising:
an input coupler for incoupling the second image light into a TIR path in the second IDA waveguide via a second pupil;
a first grating with a first K-vector; and
a second grating with a second K-vector different than the first K-vector and sharing a multiplexed region with the first grating,
wherein the first grating and the second grating together provide two-dimensional beam expansion to the second image light, and
wherein the portions of the first grating and the second grating sharing the multiplexed region together extract the two-dimensionally expanded second image light towards the eyebox.

2. The waveguide display device of claim 1 , wherein a first portion of the incoupled first image light is passed to the first grating of the first IDA waveguide which provides beam expansion to the incoupled first image light in a first direction and passes the first direction beam expanded light onto the multiplexed region,
wherein the portion of the second grating of the first IDA waveguide in the multiplexed region is configured to provide beam expansion in a second direction different from the first direction to produce a first two-dimensionally expanded first image light,
wherein a second portion of the incoupled first image light is passed to the second grating of the first IDA waveguide which provides beam expansion to the incoupled first image light in a third direction to produce a third direction expanded first image light,
wherein the portion of the first grating of the first IDA waveguide in the multiplexed region is configured to provide beam expansion in a fourth direction different from the third direction to produce a second two-dimensionally expanded first image light, and
wherein the multiplexed region of the first IDA waveguide is configured to extract the first two-dimensionally expanded first image light and the second two-dimensionally expanded first image light from the first IDA waveguide towards the eyebox.

3. The waveguide display device of claim 2 , wherein a first portion of the incoupled second image light is passed to the first grating of the second IDA waveguide which provides beam expansion to the incoupled second image light in a first direction and passes the first direction beam expanded light onto the multiplexed region,
wherein the portion of the second grating of the second IDA waveguide in the multiplexed region is configured to provide beam expansion in a second direction different from the first direction to produce a first two-dimensionally expanded second image light,
wherein a second portion of the incoupled second image light is passed to the second grating of the second IDA waveguide which provides beam expansion to the incoupled second image light in a third direction to produce a third direction expanded second image light,
wherein the portion of the first grating of the second IDA waveguide in the multiplexed region is configured to provide beam expansion in a fourth direction different from the third direction to produce a second two-dimensionally expanded second image light,
wherein the multiplexed region of the second IDA waveguide is configured to extract the first two-dimensionally expanded second image light and the second two-dimensionally expanded second image light from the second IDA waveguide towards the eyebox, and
wherein the first IDA waveguide and the second IDA waveguide comprise an overlapping region where the first two-dimensionally expanded first image light, the second two-dimensionally expanded first image light, the first two-dimensionally expanded second image light, and the second two-dimensionally expanded second image light is ejected towards the eyebox.

4. The waveguide display device of claim 3 , wherein the first two-dimensionally expanded first image light and the second two-dimensionally expanded first image light create a first field of view, and wherein the first two-dimensionally expanded second image light and the second two-dimensionally expanded second image light create a second field of view, and wherein the first field of view and second field of view include an overlapping region which combines the resolution of the first field of view and the second field of view.

5. The waveguide display device of claim 4 , wherein the first field of view includes first non-overlapping regions on opposite sides of the overlapping region and wherein the second field of view includes second non-overlapping regions on opposite sides of the overlapping region.

6. The waveguide display device of claim 2 , wherein the first portion corresponds to a first field of view portion and the second portion corresponds to a second field of view portion, and wherein the first field of view portion and second field of view portion each make up half of the total viewable field of view.

7. The waveguide display device of claim 1 , wherein the first pupil and the second pupil are spatially separated.

8. The waveguide display device of claim 7 , wherein the first pupil and the second pupil are positioned in different areas of a head band.

9. The waveguide display device of claim 8 , wherein the first IDA waveguide and the second IDA waveguide are partially disposed on the head band and partially disposed on an eyepiece.

10. The waveguide display device of claim 1 , wherein the first IDA waveguide and the second IDA waveguide have orthogonal principal axis.

11. The waveguide display device of claim 1 , wherein the first grating and second grating of the first IDA waveguide have at least one of different aspect ratios, different grating clock angles, or different grating pitches.

12. The waveguide display device of claim 1 , wherein the first grating and the second grating of the second IDA waveguide have at least one of different aspect ratios, different grating clock angles, or different grating pitches.

13. The waveguide display device of claim 1 , wherein the first IDA waveguide and the second IDA waveguide are integrated onto a first eyepiece.

14. The waveguide display device of claim 13 , further comprising:
a third input image source providing third image light;
a fourth input image source providing fourth image light;
a third IDA waveguide comprising:
an input coupler for incoupling the third image light into a TIR path in the first IDA waveguide via a third pupil;
a first grating with a first K-vector; and
a second grating with a second K-vector different than the first K-vector and sharing a multiplexed region with the first grating,
wherein a first portion of the incoupled third image light is passed to the first grating which provides beam expansion to the incoupled third image light in a first direction and passes the first direction beam expanded light onto the multiplexed region,
wherein the portion of the second

Assignees

• Digilens Inc

Inventors

• Popovich Milan Momcilo
• Grant Alastair John
• Shams Nima
• Waldern Jonathan David
• He Sihui
• Lao Edward
• Conley Smith Roger Allen

Classifications

• G02B27/0103 Primary

  comprising holographic elements · CPC title

• G02B6/0016

  Grooves, prisms, gratings, scattering particles or rough surfaces · CPC title

• G02B2027/0125

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

• G02B6/34

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

• G02B27/0172 Primary

  characterised by optical features · CPC title