# US 8,786,174 B2 · Organic light emitting display device and method of manufacturing the same

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- Number: US 8,786,174 B2
- Document ID: US8786174B2
- Status: Granted
- Kind: B2
- Application number: 13/907,695
- Filed: 2013-05-31
- Published: 2014-04-10
- Granted: 2014-07-22
- Earliest claimed: 2012-10-08
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Young Il Kim; Euigyu Kim; Arong Lee
- Web page: https://patentgrep.com/patent/US8786174B2

## CPC

- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 50/15: Hole transporting layers
- H10K 50/16: Electron transporting layers
- H10K 50/171: {Electron injection layers}
- H10K 71/12: using liquid deposition, e.g. spin coating
- H10K 71/15: characterised by the solvent used
- H10K 59/173: comprising banks or shadow masks
- H10K 59/35: comprising red-green-blue [RGB] subpixels
- H10K 2102/351: {Thickness}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An organic light emitting display device includes a substrate in which a first pixel area and a second pixel area different from each other are defined, a first electrode, a pixel defining layer, a common layer, a first surface processing layer, a second surface processing layer, a first liquid solution layer, a second liquid solution layer, and a second electrode. The first surface processing layer has a first width and is correspondingly included in the first pixel area. The second surface processing layer has a second width different from the first width and is correspondingly included in the second pixel area. The first liquid solution layer has the first width, and the second liquid solution layer has the second width. The first and second liquid solution layers have the same volume and different thicknesses.

## Claims

### Claim 1

An organic light emitting display device comprising:
a substrate in which a first pixel area and a second pixel area different from each other are defined;
a first electrode on the substrate and included in each of the first and second pixel areas;
a pixel defining layer on the substrate and the first electrode and having an opening exposing a part of the first electrode;
a common layer on an entire surface of the substrate;
a surface processing layer on the substrate and covering the opening and a part of the pixel defining layer connected to the opening;
a first liquid solution layer on the surface processing layer and included in the first pixel area;
a second liquid solution layer on the surface processing layer and included in the second pixel area; and
a second electrode on the common layer, the first liquid solution layer and the second liquid solution layer,
wherein the first liquid solution layer and the second liquid solution layer have the same volume and different thicknesses.

### Claim 2 (depends on 1)

The organic light emitting display device of claim 1, wherein the surface processing layer comprises:
a first surface processing layer which has a first width and is correspondingly included in the first pixel area; and
a second surface processing layer which has a second width different from the first width and is correspondingly included in the second pixel area.

### Claim 3 (depends on 2)

The organic light emitting display device of claim 2, wherein the first surface processing layer and the second surface processing layer are formed of lyotropic material with respect to the first liquid solution layer and the second liquid solution layer, respectively.

### Claim 4 (depends on 2)

The organic light emitting display device of claim 2, wherein the first liquid solution layer and the second liquid solution layer are in contact with a top surface of the first surface processing layer and a top surface of the second surface processing layer, respectively.

### Claim 5 (depends on 4)

The organic light emitting display device of claim 4, wherein the first liquid solution layer has a first width and the second liquid solution layer has a second width.

### Claim 6 (depends on 5)

The organic light emitting display device of claim 5, wherein each of the first liquid solution layer and the second liquid solution layer comprises at least one of a hole injection layer on the pixel defining layer; a hole transport layer on the hole injection layer; an organic light emitting layer on the hole transport layer; an electron transport layer on the hole transport layer; and an electron injection layer on the hole transport layer.

### Claim 7 (depends on 6)

The organic light emitting display device of claim 6, wherein in the case that each of the first liquid solution layer and the second liquid solution layer comprises one, two, three or four of the hole injection layer, the hole transport layer, the organic light emitting layer, the electron transport layer and the electron injection layer, the common layer comprises the rest.

### Claim 8 (depends on 5)

The organic light emitting display device of claim 5, wherein each of the first liquid solution layer and the second liquid solution layer is an organic light emitting layer from which a light is emitted.

### Claim 9 (depends on 8)

The organic light emitting display device of claim 8, wherein the common layer comprises:
a hole injection layer on the pixel defining layer;
a hole transport layer on the hole injection layer;
an electron transport layer on the hole transport layer; and
an electron injection layer on the electron transport layer.

### Claim 10 (depends on 9)

The organic light emitting display device of claim 9, wherein the surface processing layer, the first liquid solution layer and the second liquid solution layer are disposed between the hole transport layer and the electron transport layer.

### Claim 11

A method of manufacturing an organic light emitting display device, the method comprising:
providing a substrate in which a first pixel area and a second pixel area different from each other are defined;
forming a first electrode at each of the first pixel area and the second pixel area on the substrate;
forming a pixel defining layer on the substrate to expose a part of the first electrode;
forming a common layer on an entire surface of the substrate;
forming a surface processing layer at each of the first pixel area and the second pixel area on the substrate;
forming a first liquid solution layer having a first thickness by spraying a first solution having a first volume to the first pixel area; and
forming a second liquid solution layer having a second thickness different from the first thickness by spraying a second solution having the first volume to the second pixel area.

### Claim 12 (depends on 11)

The method of claim 11, wherein the forming of the surface processing layer comprises:
forming a lyotropic material layer with respect to the first solution and the second solution on the substrate to have a uniform thickness; and
forming a first surface processing layer and a second surface processing layer by patterning the lyotropic material layer to have different widths at the first pixel area and the second pixel area, respectively.

### Claim 13 (depends on 12)

The method of claim 12, wherein the forming of the first liquid solution layer comprises:
spraying the first solution to have the same width as the first surface processing layer; and
drying the first solution.

### Claim 14 (depends on 12)

The method of claim 12, wherein the forming of the second liquid solution layer comprises:
spraying the second solution to have the same width as the second surface processing layer; and
drying the second solution.

### Claim 15 (depends on 11)

The method of claim 11, wherein the forming of the common layer comprises:
forming a hole injection layer on the pixel defining layer;
forming a hole transport layer on the hole injection layer;
forming an electron transport layer on the hole transport layer; and
forming an electron injection layer on the electron transport layer.

### Claim 16 (depends on 15)

The method of claim 15, wherein the surface processing layer, the first solution layer and the second solution layer are formed after the hole transport layer is formed and before the electron transport layer is formed.

### Claim 17 (depends on 11)

The method of claim 11, wherein the first solution and the second solution are sprayed using a nozzle of the same size.

### Claim 18 (depends on 11)

The method of claim 11, further comprising forming a second electrode on an entire surface of the substrate.