# US 10,121,835 B2 · Display device

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- Number: US 10,121,835 B2
- Document ID: US10121835B2
- Status: Granted
- Kind: B2
- Application number: 15/635,668
- Filed: 2017-06-28
- Published: 2018-01-11
- Granted: 2018-11-06
- Earliest claimed: 2016-07-05
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Shigeru Sakamoto
- Web page: https://patentgrep.com/patent/US10121835B2

## CPC

- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 59/879: {comprising refractive means, e.g. lenses}
- H10K 59/8731: {multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers}
- H10K 2102/3026: {Top emission}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

To provide a display device including a pixel electrode formed on an insulating surface; a bank covering an end portion of the pixel electrode and having an opening formed therein in which the upper surface of the pixel electrode is exposed; an organic layer containing a light emitting layer and formed covering the opening; and an opposed electrode formed on the organic layer and the bank. The bank has a first layer formed on an end portion of the pixel electrode and the insulating surface, and a second layer formed on the first layer. The refractive index of the material forming the first layer is less than the refractive index of the material forming the second layer.

## Claims

### Claim 1

A display device, comprising:
a pixel electrode formed on an insulating surface;
a bank covering an end portion of the pixel electrode and having an opening formed therein in which an upper surface of the pixel electrode is exposed;
an organic layer containing a light emitting layer and formed covering the opening; and
an opposed electrode formed on the organic layer and the bank, wherein
the bank has a first layer formed on an end portion of the pixel electrode and the insulating surface, and a second layer formed on the first layer,
a refractive index of material forming the first layer is less than a refractive index of material forming the second layer,
the first layer has a first lateral wall that defines a first angle relative to the upper surface of the pixel electrode,
the second layer has a second lateral wall that defines a second angle relative to the upper surface of the pixel electrode, and
the first angle is greater than the second angle.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein an interface between the first layer and the second layer is formed in a direction along the upper surface of the pixel electrode.

### Claim 3 (depends on 1)

The display device according to claim 1, wherein the first lateral wall and the second lateral wall are formed continuous to each other.

### Claim 4 (depends on 1)

The display device according to claim 1, wherein
an upper surface of the first layer is formed continuous to the first lateral wall, and
the second lateral wall is formed continuous to the upper surface of the first layer.

### Claim 5 (depends on 1)

The display device according to claim 1, further comprising:
an inorganic insulating film formed on the opposed electrode; and
an organic insulating film formed on the inorganic insulating film.

### Claim 6 (depends on 5)

The display device according to claim 5, wherein a refractive index of material forming the inorganic insulating film is greater than a refractive index of material forming the first layer.

### Claim 7 (depends on 5)

The display device according to claim 5, wherein a refractive index of material forming the inorganic insulating film is greater than a refractive index of material forming the second layer.

### Claim 8

A display device, comprising:
a pixel electrode formed on an insulating surface;
a bank covering an end portion of the pixel electrode and having an opening formed therein in which an upper surface of the pixel electrode is exposed;
an organic layer containing a light emitting layer and formed covering the opening; and
an opposed electrode formed on the organic layer and the bank, wherein the bank has a first layer formed on an end portion of the pixel electrode and the insulating surface, and a second layer formed on the first layer,
the first layer has a first lateral wall that defines a first angle relative to the upper surface of the pixel electrode,
the second layer has a second lateral wall that defines a second angle relative to the upper surface of the pixel electrode, and
the first angle is greater than the second angle.

### Claim 9 (depends on 8)

The display device according to claim 8, wherein
an interface between the first layer and the second layer is formed in a direction along the upper surface of the pixel electrode.

### Claim 10 (depends on 8)

The display device according to claim 8, wherein
the first lateral wall and the second lateral wall are formed continuous to each other.

### Claim 11 (depends on 8)

The display device according to claim 8, wherein
an upper surface of the first layer is formed continuous to the first lateral wall, and
the second lateral wall is formed continuous to the upper surface of the first layer.

### Claim 12 (depends on 8)

The display device according to claim 8, further comprising:
an inorganic insulating film formed on the opposed electrode; and
an organic insulating film formed on the inorganic insulating film.

### Claim 13 (depends on 12)

The display device according to claim 12, wherein
a refractive index of material forming the inorganic insulating film is greater than a refractive index of material forming the first layer.

### Claim 14 (depends on 12)

The display device according to claim 12, wherein
a refractive index of material forming the inorganic insulating film is greater than a refractive index of material forming the second layer.