Light-emitting display device and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-9704935-B2
Application number	US-201514884800-A
Country	US
Kind code	B2
Filing date	Oct 16, 2015
Priority date	Mar 24, 2015
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A light-emitting display device, including a substrate including a plurality of pixels; a first electrode on the substrate in each of the pixels; a pixel defining layer on the substrate, the pixel defining layer having an opening exposing the first electrode and including a side surface having a first part, a second part located on the first part, and a boundary part located between the first part and the second part; a lyophobic pattern in the boundary part of the side surface of the pixel defining layer in the opening of the pixel defining layer; an organic layer on the first electrode, the organic layer including a light-emitting layer under the lyophobic pattern in the opening of the pixel defining layer; and a second electrode on the organic layer.

First claim

What is claimed is:

1. A light-emitting display device, comprising:
a substrate including a plurality of pixels;
a first electrode on the substrate in each of the pixels;
a pixel defining layer on the substrate, the pixel defining layer having an opening exposing the first electrode and including a side surface having a first part, a second part located on the first part, and a boundary part located between the first part and the second part;
a lyophobic pattern in the boundary part of the side surface of the pixel defining layer in the opening of the pixel defining layer, the lyophobic pattern being a ring pattern;
an organic layer on the first electrode, the organic layer including a light-emitting layer under the lyophobic pattern in the opening of the pixel defining layer; and
a second electrode on the organic layer.

2. The display device as claimed in claim 1 , wherein the lyophobic pattern contacts an end of the light-emitting layer.

3. The display device as claimed in claim 1 , wherein the lyophobic pattern includes an insulating material that contains fluorine.

4. The display device as claimed in claim 1 , wherein the organic layer further includes one or more of a hole injection layer between the first electrode and the light-emitting layer and under the lyophobic pattern in the opening of the pixel defining layer, a hole transport layer between the hole injection layer and the light-emitting layer and under the lyophobic pattern in the opening of the pixel defining layer, an electron transport layer between the light-emitting layer and the second electrode, or an electron injection layer between the electron transport layer and the second electrode.

5. The display device as claimed in claim 1 , wherein the pixel defining layer includes an organic material or an inorganic material.

6. A light-emitting display device, comprising:
a substrate including a first pixel and a second pixel;
a first electrode on the substrate in each of the first and second pixels;
a pixel defining layer on the substrate, the pixel defining layer having a first opening exposing the first electrode of the first pixel and a second opening exposing the first electrode of the second pixel;
a first lyophobic pattern in the first opening of the pixel defining layer and at a first location on a side surface of the pixel defining layer, the first location being relative to a height of the pixel defining layer;
a second lyophobic pattern in the second opening of the pixel defining layer and at a second location on the side surface of the pixel defining layer, the second location being relative to the height of the pixel defining layer, the second location being lower than the first location;
a first organic layer including a first light-emitting layer under the first lyophobic pattern in the first opening of the pixel defining layer;
a second organic layer including a second light-emitting layer under the second lyophobic pattern in the second opening of the pixel defining layer, a thickness of the second organic layer being less than a thickness of the first organic layer; and
a second electrode on the first organic layer and the second organic layer.

7. The display device as claimed in claim 6 , wherein each of the first lyophobic pattern and the second lyophobic pattern is formed as a ring pattern.

8. The display device as claimed in claim 6 , wherein:
the first lyophobic pattern contacts an end of the first light-emitting layer, and
the second lyophobic pattern contacts an end of the second light-emitting layer.

9. The display device as claimed in claim 6 , wherein each of the first lyophobic pattern and the second lyophobic pattern includes an insulating material that contains fluorine.

10. The display device as claimed in claim 6 , wherein:
the second location and the first location are at a same height relative to the height of the pixel defining layer; and
a thickness of the second organic layer is equal to a thickness of the first organic layer.

11. The display device as claimed in claim 6 , wherein the first pixel and the second pixel emit light of different colors.

12. The display device as claimed in claim 6 , wherein the pixel defining layer includes an organic material or an inorganic material.

13. A method of manufacturing a light-emitting display device, the method comprising:
forming a first electrode on a substrate having a plurality of pixels in each of the pixels;
forming a pixel defining layer on the substrate, the pixel defining layer having an opening exposing the first electrode and a side surface including a first part, a second part located on the first part, and a boundary part located between the first part and the second part;
forming a lyophobic pattern in the boundary part of the side surface of the pixel defining layer in the opening of the pixel defining layer;
forming an organic layer, the organic layer including a light-emitting layer under the lyophobic pattern in the opening of the pixel defining layer, on the first electrode; and
forming a second electrode on the organic layer, wherein forming the lyophobic pattern includes:
filling the opening of the pixel defining layer with a first solvent up to a first location between the first part and the boundary part;
ejecting a second solvent mixed with a fluorine-containing insulating material onto the first solvent;
agglomerating the fluorine-containing insulating material at the first location by drying the second solvent; and
having a pinning point formed by the lyophobic pattern formed at the first location by drying the first solvent.

14. The method as claimed in claim 13 , wherein:
the first solvent is non-polar, and
the second solvent is polar.

15. The method as claimed in claim 13 , wherein:
the pixels include a first pixel and a second pixel, the opening of the pixel defining layer is divided into a first opening exposing the first electrode formed in the first pixel and a second opening exposing the first electrode formed in the second pixel,
filling the opening includes filling the first opening of the pixel defining layer with the first solvent up to the first location on a side surface of the pixel defining layer, the first location being relative to a height of the pixel defining layer, and filling the second opening of the pixel defining layer with the first solvent up to a second location on the side surface of the pixel defining layer, the second location being relative to the height of the pixel defining layer;
ejecting the second solvent onto the first solvent includes ejecting the second solvent in each of the first opening of the pixel defining layer and the second opening of the pixel defining layer;
and
having a pinning point includes having a first pinning point formed by a first lyophobic pattern formed at the first location and a second pinning point formed by a second lyophobic pattern formed at the second location by drying the first solvent in each of the first opening of the pixel defining layer and the second opening of the pixel defining layer.

16. The method as claimed in claim 15 , wherein forming the light-emitting layer of the organic layer includes ejecting a first light-emitting solution into the first opening and a second light-emitting solution into the second opening by adjusting a volume of the first light-emitting solution and a volume of the second light-emitting solution such that a maximum height between the first pinning point and a surface of the first light-emitting solution in the first opening is equal to a maximum height between the second pinni

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Geun Tak

Classifications

• H01L27/3246

  Electricity · mapped topic

• H01L27/326

  Electricity · mapped topic

• H01L2227/323

  Electricity · mapped topic

• H01L27/3258 Primary

  Electricity · mapped topic

• H10K59/1201

  Manufacture or treatment · CPC title