Organic light emitting diode display and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-9331131-B2
Application number	US-201414278135-A
Country	US
Kind code	B2
Filing date	May 15, 2014
Priority date	May 28, 2013
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

An organic light emitting diode display includes a substrate including a thin film transistor, a plurality of pixels on a pixel area of the substrate, a plurality of auxiliary electrodes between the pixels, an opposite electrode on the pixels and on the auxiliary electrodes, the opposite electrode being electrically connected to the auxiliary electrodes, and including a same material as the auxiliary electrodes, and a power supply electrode on the substrate, the power supply electrode being in a periphery of the pixel area and being configured to supply power to the pixels.

First claim

What is claimed is:

1. An organic light emitting diode display, comprising:
a substrate including a thin film transistor;
a plurality of pixels on a pixel area of the substrate;
a plurality of auxiliary electrodes between the pixels;
an opposite electrode on the pixels and on the auxiliary electrodes, the opposite electrode being electrically connected to the auxiliary electrodes, and including a same material as the auxiliary electrodes; and
a power supply electrode on the substrate, the power supply electrode being in a periphery of the pixel area and being configured to supply power to the pixels,
wherein the auxiliary electrodes are under the opposite electrode, the auxiliary electrodes being thicker than the opposite electrode.

2. The organic light emitting diode display as claimed in claim 1 , wherein the auxiliary electrodes are between the pixels in a longitudinal direction of the substrate.

3. The organic light emitting diode display as claimed in claim 1 , wherein the auxiliary electrodes are between the pixels in a horizontal direction of the substrate.

4. The organic light emitting diode display as claimed in claim 1 , wherein the auxiliary electrodes are between the pixels in a longitudinal direction and a horizontal direction of the substrate.

5. The organic light emitting diode display as claimed in claim 1 , wherein the auxiliary electrodes are straight lines.

6. The organic light emitting diode display as claimed in claim 1 , wherein the auxiliary electrodes are dotted lines.

7. The organic light emitting diode display as claimed in claim 1 , wherein only the opposite electrode among the opposite electrode and the auxiliary electrodes overlaps the pixels.

8. The organic light emitting diode display as claimed in claim 1 , wherein an upper surface of power supply electrode is level with an upper surface of the opposite electrode.

9. The organic light emitting diode display as claimed in claim 1 , wherein the power supply electrode is disposed on two opposite sides of the substrate along edges of the substrate in a row direction.

10. The organic light emitting diode display as claimed in claim 1 , wherein the power supply electrode is on a single side of the substrate along an edge of the substrate in a row direction.

11. The organic light emitting diode display as claimed in claim 1 , wherein the auxiliary electrodes and the opposite electrode consist essentially of the same material.

12. The organic light emitting diode display as claimed in claim 1 , wherein the opposite electrode directly contacts and overlaps an entire upper surface of the auxiliary electrodes.

13. The organic light emitting diode display as claimed in claim 12 , wherein a lowermost surface of the opposite electrode is level with a lowermost surface of the auxiliary electrodes.

14. The organic light emitting diode display as claimed in claim 1 , further comprising:
a pixel electrode on the pixel area of the substrate and electrically connected to the thin film transistor; and
a pixel defining layer covering edges of the pixel electrode and having an opening exposing a portion of an upper surface of the pixel electrode, the auxiliary electrodes being on an upper surface of the pixel defining layer.

15. A method of manufacturing an organic light emitting display device, the method comprising:
forming a thin film transistor on a substrate, the substrate including a plurality of pixels on a pixel area;
forming a pixel electrode on the pixel area of the substrate, the pixel electrode being electrically connected to the thin film transistor;
forming a pixel defining layer having an opening exposing the pixel electrode on the substrate;
forming an intermediate layer including a light emitting layer on the pixel electrode exposed through the opening of the pixel defining layer;
forming a plurality of auxiliary electrodes on the pixel defining layer, the auxiliary electrodes being between the plurality of pixels;
forming an opposite electrode on the intermediate layer and on the auxiliary electrodes, the opposite electrode being electrically connected to the auxiliary electrodes and being formed of a same material as the auxiliary electrodes; and
forming a power supply electrode on the substrate, the power supply electrode being in a periphery of the pixel area and being configured to supply power to the pixels,
wherein the auxiliary electrodes are under the opposite electrode, the auxiliary electrodes being thicker than the opposite electrode.

16. The method as claimed in claim 15 , wherein the intermediate layer includes a first common layer, the light emitting layer, and a second common layer.

17. The method as claimed in claim 16 , wherein the first common layer and the second common layer overlap the pixel defining layer and the pixel electrode, the light emitting layer being formed on the pixel electrode.

18. The method as claimed in claim 16 , wherein the first common layer includes a hole injection layer and a hole transport layer which are sequentially stacked.

19. The method as claimed in claim 16 , wherein the second common layer includes an electron transport layer and an electron injection layer which are sequentially stacked.

20. The method as claimed in claim 15 , wherein an upper surface of power supply electrode is level with an upper surface of the opposite electrode.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Su-Hwan
• Kim Mu-Hyun

Classifications

• H10K59/121

  characterised by the geometry or disposition of pixel elements · CPC title

• H10K59/80522 Primary

  combined with auxiliary electrodes · CPC title

• H01L51/5228

  Electricity · mapped topic

• H01L27/3246

  Electricity · mapped topic

• H01L27/3276

  Electricity · mapped topic