# US 2021/0082994 A1 · Display device

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- Number: US 2021/0082994 A1
- Document ID: US20210082994A1
- Status: Published application
- Kind: A1
- Application number: 17/018,437
- Filed: 2020-09-11
- Published: 2021-03-18
- Earliest claimed: 2019-09-12
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Osamu ITOU
- Web page: https://patentgrep.com/patent/US20210082994A1

## CPC

- H10H 29/142: {Two-dimensional arrangements, e.g. asymmetric LED layout}
- H10W 90/00: Package configurations
- G02B 5/0257: {creating an anisotropic diffusion characteristic, i.e. distributing output differently in two perpendicular axes}
- G02B 5/0278: {used in transmission}
- H10H 20/84: Coatings, e.g. passivation layers or antireflective coatings
- H10H 20/855: Optical field-shaping means, e.g. lenses
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

According to an aspect, a display device includes: a substrate; a plurality of pixels; a first anisotropic diffusion layer and a second anisotropic diffusion layer that are layered; and a plurality of light emitting elements interposed between the first anisotropic diffusion layer and the substrate. The first anisotropic diffusion layer and the second anisotropic diffusion layer each include a high refractive index region and a low refractive index region in a mixed manner. An absolute value of a first angle formed by a boundary between the high refractive index region and the low refractive index region of the first anisotropic diffusion layer and a direction perpendicular to the substrate is different from an absolute value of a second angle formed by a boundary between the high refractive index region and the low refractive index region of the second anisotropic diffusion layer and the direction perpendicular to the substrate.

## Claims

### Claim 1

A display device comprising:
a substrate;
a plurality of pixels provided to the substrate;
a plurality of light emitting elements provided to the pixels;
a first anisotropic diffusion layer facing the substrate with the light emitting elements interposed between the first anisotropic diffusion layer and the substrate; and
a second anisotropic diffusion layer, wherein
the first anisotropic diffusion layer and the second anisotropic diffusion layer are layered,
the first anisotropic diffusion layer and the second anisotropic diffusion layer each include a region in an in-plane direction including a high refractive index region and a low refractive index region in a mixed manner, and
an absolute value of a first angle formed by a boundary between the high refractive index region and the low refractive index region of the first anisotropic diffusion layer and a direction perpendicular to the substrate is different from an absolute value of a second angle formed by a boundary between the high refractive index region and the low refractive index region of the second anisotropic diffusion layer and the direction perpendicular to the substrate.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein
the second anisotropic diffusion layer is disposed farther away from the substrate in the direction perpendicular to the substrate than the first anisotropic diffusion layer is, and
the absolute value of the first angle is larger than the absolute value of the second angle.

### Claim 3 (depends on 1)

The display device according to claim 1, wherein a first azimuth angle of a scattering central axis of light of the first anisotropic diffusion layer is equal to a second azimuth angle of a scattering central axis of light of the second anisotropic diffusion layer in planar view viewed from the direction perpendicular to the substrate.

### Claim 4 (depends on 1)

The display device according to claim 1, further comprising:
a third anisotropic diffusion layer and a fourth anisotropic diffusion layer, wherein
an absolute value of a third angle formed by a boundary between the high refractive index region and the low refractive index region of the third anisotropic diffusion layer and the direction perpendicular to the substrate is different from an absolute value of a fourth angle formed by a boundary between the high refractive index region and the low refractive index region of the fourth anisotropic diffusion layer and the direction perpendicular to the substrate.

### Claim 5 (depends on 4)

The display device according to claim 4, wherein
the fourth anisotropic diffusion layer is disposed farther away from the substrate in the direction perpendicular to the substrate than the third anisotropic diffusion layer is, and
the absolute value of the third angle is larger than the absolute value of the fourth angle.

### Claim 6 (depends on 4)

The display device according to claim 4, wherein a third azimuth angle of a scattering central axis of light of the third anisotropic diffusion layer is equal to a fourth azimuth angle of a scattering central axis of light of the fourth anisotropic diffusion layer in planar view viewed from the direction perpendicular to the substrate.

### Claim 7 (depends on 6)

The display device according to claim 6, wherein the third azimuth angle and the fourth azimuth angle are directed in a direction opposite to a direction of the first azimuth angle of the scattering central axis of light of the first anisotropic diffusion layer and the second azimuth angle of the scattering central axis of light of the second anisotropic diffusion layer.

### Claim 8 (depends on 4)

The display device according to claim 4, wherein the first anisotropic diffusion layer, the second anisotropic diffusion layer, the third anisotropic diffusion layer, and the fourth anisotropic diffusion layer are layered in the order as listed, in the direction perpendicular to the substrate.

### Claim 9 (depends on 4)

The display device according to claim 4, wherein at least one of the third anisotropic diffusion layer and the fourth anisotropic diffusion layer is disposed between the first anisotropic diffusion layer and the second anisotropic diffusion layer in the direction perpendicular to the substrate.

### Claim 10 (depends on 4)

The display device according to claim 4, further comprising:
a fifth anisotropic diffusion layer and a sixth anisotropic diffusion layer, wherein
a fifth azimuth angle of a scattering central axis of light of the fifth anisotropic diffusion layer and a sixth azimuth angle of a scattering central axis of light of the sixth anisotropic diffusion layer are orthogonal to the first azimuth angle and the second azimuth angle in planar view viewed from the direction perpendicular to the substrate.

### Claim 11 (depends on 1)

The display device according to claim 1, wherein
a plurality of the high refractive index regions each have a columnar shape and incline with respect to the direction perpendicular to the substrate, and
the low refractive index region is disposed between the high refractive index regions.

### Claim 12 (depends on 1)

The display device according to claim 1, wherein relative luminance of light emitted from the light emitting elements is higher at a polar angle of 45° than at a polar angle of 0°.