# US 10,312,307 B2 · Electroluminescent display device

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- Number: US 10,312,307 B2
- Document ID: US10312307B2
- Status: Granted
- Kind: B2
- Application number: 15/842,767
- Filed: 2017-12-14
- Published: 2018-07-05
- Granted: 2019-06-04
- Earliest claimed: 2016-12-29
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: SeungHan Paek; Jeongwon Lee; Jonghoon Yeo; Jihoon Lee
- Web page: https://patentgrep.com/patent/US10312307B2

## CPC

- H10K 59/124: Insulating layers formed between TFT elements and OLED elements
- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 59/80515: {characterised by their shape}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

Disclosed are an electroluminescent display device and a method of manufacturing the same. The electroluminescent display device includes a first bank on a substrate, an anode electrode extending to one side and another side of the first bank in an area exposed by the first bank, a second bank on each of one side and another side of the anode electrode, a light emitting layer on an upper surface of the anode electrode exposed by the second bank, and a cathode electrode on the light emitting layer. Since the anode electrode is provided on the first bank, the anode electrode is prevented from being damaged in a process of patterning the first bank.

## Claims

### Claim 1

An electroluminescent display device, comprising:
a first bank provided to expose a first opening area on a substrate;
an anode electrode extending from one side to the other side of the first bank to overlay a portion of the first bank on each side;
a second bank positioned to overlay a first side and a second side of the anode electrode, and provided to expose a second opening area on the anode electrode,
wherein the second opening area is provided wider than the first opening area;
a light emitting layer on an upper surface of the anode electrode that is exposed by the second bank; and
a cathode electrode on the light emitting layer.

### Claim 2 (depends on 1)

The electroluminescent display device of claim 1, wherein
the first bank comprises an inorganic material, and
an upper surface of the second bank comprises an organic material having hydrophobicity.

### Claim 3 (depends on 1)

The electroluminescent display device of claim 1, wherein a side surface of the first bank is inclined at a certain angle with respect to a surface of the substrate.

### Claim 4 (depends on 1)

The electroluminescent display device of claim 1, further comprising:
a thin film transistor on the substrate; and
a planarization layer on the thin film transistor,
wherein the first bank is provided on the planarization layer.

### Claim 5 (depends on 4)

The electroluminescent display device of claim 4, wherein the anode electrode is connected to the thin film transistor through a contact hole provided in the planarization layer.

### Claim 6 (depends on 5)

The electroluminescent display device of claim 5, wherein the first bank is spaced apart from the contact hole and the anode electrode does not pass through the first bank.

### Claim 7 (depends on 1)

The electroluminescent display device of claim 1, wherein the anode electrode is connected to the thin film transistor through a contact hole which is provided in the planarization layer and the first bank and the anode electrode overlays a portion of the first bank that is located between the contact hole and the first opening area.

### Claim 8 (depends on 1)

The electroluminescent display device of claim 1, wherein an end region of the first bank that is overlaid by the anode has a slope of a selected angle.

### Claim 9 (depends on 8)

The electroluminescent display device of claim 8, wherein the selected angle is about 45°.

### Claim 10 (depends on 8)

The electroluminescent display device of claim 8, wherein the selected angle is less than 45° and greater than 30°.

### Claim 11 (depends on 8)

The electroluminescent display device of claim 8, wherein the selected angle is less than 40° and greater than 25°.