# US 2022/0035091 A1 · Multi-waveguide light field display

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- Number: US 2022/0035091 A1
- Document ID: US20220035091A1
- Status: Published application
- Kind: A1
- Application number: 17/451,366
- Filed: 2021-10-19
- Published: 2022-02-03
- Earliest claimed: 2016-11-30
- Assignees: Molecular Imprints, Inc.
- Applicants: Molecular Imprints, Inc.
- Inventors: Frank Y. Xu; Michael Nevin Miller; Kang Luo; Vikramjit Singh; Michael Klug
- Web page: https://patentgrep.com/patent/US20220035091A1

## CPC

- G02B 6/0038: {Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide}
- G02B 5/1842: {Gratings for image generation (G02B5/1847 takes precedence)}
- G02B 6/0065: {Manufacturing aspects; Material aspects}
- G02B 6/0076: {Stacked arrangements of multiple light guides of the same or different cross-sectional area}
- G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)}
- G02B 27/0172: {characterised by optical features}
- G02B 1/11: Anti-reflection coatings
- G02B 27/4205: {having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant}
- G02B 27/4272: {having plural diffractive elements positioned sequentially along the optical path}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A multi-waveguide optical structure, including multiple waveguides stacked to intercept light passing sequentially through each waveguide, each waveguide associated with a differing color and a differing depth of plane, each waveguide including: a first adhesive layer, a substrate having a first index of refraction, and a patterned layer positioned such that the first adhesive layer is between the patterned layer and the substrate, the first adhesive layer providing adhesion between the patterned layer and the substrate, the patterned layer having a second index of refraction less than the first index of refraction, the patterned layer defining a diffraction grating, wherein a field of view associated with the waveguide is based on the first and the second indices of refraction.

## Claims

### Claim at position 1

-20. (canceled)

### Claim 21

A method of forming a waveguide stack, the method comprising:
forming a plurality of waveguides, wherein forming each of the waveguides comprises:
obtaining a substrate having a first index of refraction;
applying a first adhesive layer onto the substrate; and
positioning a first patterned layer on the first adhesive layer such that the first adhesive layer is between the first patterned layer and the substrate, wherein the first patterned layer has a second index of refraction that is less than the first index of refraction; and
arranging the plurality of waveguides to yield the waveguide stack.

### Claim 22 (depends on 21)

The method of claim 21, wherein forming each of the waveguides further comprises applying a second adhesive layer to the substrate such that the substrate is between the first adhesive layer and the second adhesive layer.

### Claim 23 (depends on 22)

The method of claim 22, wherein the second adhesive layer is applied using vapor deposition.

### Claim 24 (depends on 22)

The method of claim 22, wherein forming each of the waveguides further comprises positioning an additional patterned layer on the second adhesive layer such that the second adhesive layer is between the substrate and the additional patterned layer.

### Claim 25 (depends on 24)

The method of claim 24, wherein the additional patterned layer has a third index of refraction that is less than the first index of refraction.

### Claim 26 (depends on 21)

The method of claim 21, wherein forming each of the waveguides further comprises:
positioning an anti-reflective layer on the substrate; and
applying a second adhesive layer such that the anti-reflective layer is positioned between the substrate and the second adhesive layer.

### Claim 27 (depends on 26)

The method of claim 26, where forming each of the waveguides further comprises positioning an additional patterned layer on the second adhesive layer such that the second adhesive layer is between the anti-reflective layer and the additional patterned layer.

### Claim 28 (depends on 21)

The method of claim 21, further comprising securing each of the waveguides in the waveguide stack to a waveguide support.

### Claim 29 (depends on 21)

The method of claim 21, wherein securing each of the waveguides in the waveguide stack to a waveguide support comprises positioning the waveguide support against the first adhesive layer of each of the waveguides in the waveguide stack.

### Claim 30 (depends on 21)

The method of claim 21, wherein the plurality of waveguides are arranged in the waveguide stack such that the waveguides are separated from one another by air.

### Claim 31 (depends on 21)

The method of claim 21, wherein forming each of the waveguides further comprises etching a portion of the substrate.

### Claim 32 (depends on 21)

The method of claim 21, further comprising forming the first patterned layer using imprint lithography.

### Claim 33 (depends on 21)

The method of claim 21, wherein forming the first patterned layer comprises:
obtaining a polymer layer; and
forming a plurality of diffraction gratings on the polymer layer.

### Claim 34 (depends on 33)

The method of claim 33, wherein the diffraction gratings have a critical dimension of 100 nanometers.

### Claim 35 (depends on 33)

The method of claim 33, wherein the polymer layer comprises acrylic polymer.

### Claim 36 (depends on 21)

The method of claim 21, wherein the substrate comprises at least one of glass or sapphire.

### Claim 37 (depends on 21)

The method of claim 21, wherein the first index of refraction is at least 1.7.

### Claim 38 (depends on 37)

The method of claim 37, the second index of refraction is approximately 1.5.

### Claim 39 (depends on 21)

The method of claim 21, further comprising arranging the waveguide stack and a light source such that the waveguide stack intercepts light emitted by the light source.

### Claim 40 (depends on 21)

A multi-waveguide optical structure comprising the waveguide stack produced by the method of claim 21.