# US 11,994,706 B2 · Method and system for integration of refractive optics with a diffractive eyepiece waveguide display

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- Number: US 11,994,706 B2
- Document ID: US11994706B2
- Status: Granted
- Kind: B2
- Application number: 17/320,060
- Filed: 2021-05-13
- Published: 2021-11-18
- Granted: 2024-05-28
- Earliest claimed: 2020-05-14
- Assignees: Magic Leap, Inc.
- Applicants: Magic Leap, Inc.
- Inventors: Chulwoo Oh; Ravi Kumar Komanduri; Vikramjit Singh; Shuqiang Yang; Frank Y. Xu
- Web page: https://patentgrep.com/patent/US11994706B2

## CPC

- G02B 6/0033: {Means for improving the coupling-out of light from the light guide}
- G02B 6/0076: {Stacked arrangements of multiple light guides of the same or different cross-sectional area}
- G02B 25/001: {Eyepieces}
- G02B 27/0172: {characterised by optical features}
- G02B 1/118: having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
- G02B 6/262: {Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An eyepiece waveguide includes a set of waveguide layers having a world side and a user side. The eyepiece waveguide also includes a first cover plate having a first optical power and disposed adjacent the world side of the set of waveguide layers and a second cover plate having a second optical power and disposed adjacent the user side of the set of waveguide layers.

## Claims

### Claim 1

An eyepiece waveguide comprising:
a set of waveguide layers having a world side and a user side;
a first cover plate including a first region having a first optical power and a first planar region laterally adjacent to the first region, and disposed adjacent the world side of the set of waveguide layers, wherein the first planar region is positioned outside the user's viewing area; and
a second cover plate having a second optical power and disposed adjacent the user side of the set of waveguide layers, wherein the first optical power and second optical power have different values with respect to each other.

### Claim 2 (depends on 1)

The eyepiece waveguide of claim 1 wherein the set of waveguide layers comprise three waveguide layers, each of the three waveguide layers being associated with red, green, or blue wavelengths.

### Claim 3 (depends on 1)

The eyepiece waveguide of claim 1 wherein the first optical power is positive and the second optical power is negative.

### Claim 4 (depends on 3)

The eyepiece waveguide of claim 3 wherein the first optical power and an absolute value of the second optical power are equal.

### Claim 5 (depends on 1)

The eyepiece waveguide of claim 1 wherein the first region of the first cover plate comprises nano-features.

### Claim 6 (depends on 5)

The eyepiece waveguide of claim 5 wherein the nano-features comprise an anti-reflection structure.

### Claim 7 (depends on 6)

The eyepiece waveguide of claim 6 wherein the second cover plate includes a second region havig the second optical power, wherein the second region comprises nano-features.

### Claim 8 (depends on 1)

The eyepiece waveguide of claim 1 wherein the second cover plate comprises a second region having the second optical power and a second planar region laterally adjacent to the second region, wherein the second region is positioned outside the user's viewing area.

### Claim 9 (depends on 1)

The eyepiece waveguide of claim 1 wherein the first cover plate is separated from the world side of the set of waveguide layers by a distance between 1 μm and 1 mm and the second cover plate is separated from the user side of the set of waveguide layers by a distance between 1 μm and 1 mm.

### Claim 10 (depends on 1)

The eyepiece waveguide of claim 1 wherein the first cover plate has a maximum thickness less than 1 mm and the second cover plate has a maximum thickness less than 1 mm.

### Claim 11 (depends on 10)

The eyepiece waveguide of claim 10 wherein the first cover plate comprises a first substrate and a first molded film coupled to the first substrate and characterized by a minimum thickness between 5 nm and 600 nm and the second cover plate comprises a second substrate and a second molded film coupled to the second substrate and characterized by a minimum thickness between 5 nm and 600 nm.

### Claim 12 (depends on 1)

The eyepiece waveguide of claim 1 wherein:
the first cover plate is separated from the world side of the set of waveguide layers by a first distance; and
the second cover plate is separated from the user side of the set of waveguide layers by a second distance.

### Claim 13 (depends on 1)

The eyepiece waveguide of claim 1 wherein the set of waveguide layers is disposed between the first cover plate and the second cover plate.

### Claim 14 (depends on 1)

The eyepiece waveguide of claim 1 wherein:
the second cover plate is configured to diverge light rays generated by the set of waveguide layers; and
the first cover plate is configured to compensate for the second optical power of the second cover plate.

### Claim 15 (depends on 1)

The eyepiece waveguide of claim 1 wherein:
the second cover plate comprises a second region having the second optical power and a second planar region laterally adjacent to the second region.

### Claim 16 (depends on 15)

The eyepiece waveguide of claim 15 wherein the first optical power is positive and the second optical power is negative.

### Claim 17 (depends on 16)

The eyepiece waveguide of claim 16 wherein the first optical power and an absolute value of the second optical power are equal.