# US 11,910,655 B2 · Display device

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- Number: US 11,910,655 B2
- Document ID: US11910655B2
- Status: Granted
- Kind: B2
- Application number: 17/521,045
- Filed: 2021-11-08
- Published: 2022-05-26
- Granted: 2024-02-20
- Earliest claimed: 2020-11-26
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Hiroumi Kinjo
- Web page: https://patentgrep.com/patent/US11910655B2

## CPC

- H10K 59/123: Connection of the pixel electrodes to the thin film transistors [TFT]
- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 59/12: Active-matrix OLED [AMOLED] displays
- H10K 59/80524: {Transparent cathodes, e.g. comprising thin metal layers}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

According to one embodiment, a display device includes a base, a driving transistor placed on the base, a first insulating layer placed on the driving transistor, a cathode electrode placed on the first insulating layer, an organic layer including a light-emitting layer placed on the cathode electrode, an anode electrode that covers the organic layer, a second insulating layer placed on the first insulating layer and having an opening superposed on the cathode electrode, and a barrier wall placed on the second insulating layer. The anode electrode is electrically connected to the driving transistor through a first contact hole formed in the first insulating layer and the second insulating layer.

## Claims

### Claim 1

A display device comprising:
a base;
a driving transistor placed on the base;
a first insulating layer placed on the driving transistor;
a cathode electrode placed on the first insulating layer;
an organic layer including a light-emitting layer placed on the cathode electrode;
an anode electrode that covers the organic layer;
a second insulating layer placed on the first insulating layer and having an opening superposed on the cathode electrode; and
a barrier wall placed on the second insulating layer,
wherein the anode electrode is electrically connected to the driving transistor through a first contact hole formed in the first insulating layer and the second insulating layer.

### Claim 2 (depends on 1)

The display device of claim 1, wherein the barrier wall is so shaped that an upper portion thereof is wider than a lower portion thereof.

### Claim 3 (depends on 2)

The display device of claim 2, wherein the barrier wall has a shape that is symmetrical with regard to a normal direction of a main surface of the base.

### Claim 4 (depends on 2)

The display device of claim 2, wherein the barrier wall has a shape that is asymmetrical with regard to a normal direction of a main surface of the base.

### Claim 5 (depends on 1)

The display device of claim 1, wherein:
the anode electrode is connected to a connection electrode placed to surround the organic layer in planar view; and
the connection electrode is connected to the driving transistor through the first contact hole.

### Claim 6 (depends on 5)

The display device of claim 5, wherein the organic layer is in noncontact with the connection electrode.

### Claim 7 (depends on 1)

The display device of claim 1, wherein the cathode electrode is connected to a line that applies a voltage to the cathode electrode through a second contact hole formed in the first insulating layer superposed on a surrounding area where no pixels are arranged.

### Claim 8 (depends on 1)

The display device of claim 1, wherein the cathode electrode is connected to a line that applies a voltage to the cathode electrode through a third contact hole formed in the first insulating layer superposed on a display area where pixels are arranged.

### Claim 9 (depends on 1)

The display device of claim 1, further comprising an insulating member that covers an end portion of the cathode electrode which is opposed to the first contact hole.

### Claim 10 (depends on 1)

The display device of claim 1, further comprising an insulating member that covers an inner surface of the first contact hole.

### Claim 11 (depends on 1)

The display device of claim 1, wherein:
the cathode electrode is placed on the first insulating layer and the anode electrode covers the organic layer in an area superposed on a first pixel; and
the anode electrode is placed on the first insulating layer and the cathode electrode covers the organic layer in an area superposed on a second pixel other than the first pixel.

### Claim 12 (depends on 11)

The display device of claim 11, wherein:
a first voltage is applied to the cathode electrode placed on the first insulating layer in the area superposed on the first pixel; and
a second voltage is applied to the cathode electrode covering the organic layer in the area superposed on the second pixel.

### Claim 13 (depends on 11)

The display device of claim 11, wherein the organic layer placed in the area superposed on the first pixel and the organic layer placed in the area superposed on the second pixel include light-emitting layers that emit light of a same color.

### Claim 14 (depends on 11)

The display device of claim 11, wherein the organic layer placed in the area superposed on the first pixel and the organic layer placed in the area superposed on the second pixel include light-emitting layers that emit light of different colors.

### Claim 15

A display device comprising:
a base;
a driving transistor placed on the base;
a first insulating layer placed on the driving transistor;
a cathode electrode placed on the first insulating layer;
an organic layer including a light-emitting layer placed on the cathode electrode;
an anode electrode that covers the organic layer; and
a second insulating layer placed on the first insulating layer and having an opening superposed on the cathode electrode,
wherein the anode electrode is electrically connected to the driving transistor through a contact hole formed in the first insulating layer and the second insulating layer.