Display device with moisture protection and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-10297783-B2
Application number	US-201715786648-A
Country	US
Kind code	B2
Filing date	Oct 18, 2017
Priority date	Nov 1, 2016
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

A display device includes a first inorganic insulating layer covering a display region; a first organic insulating layer on the first inorganic insulating layer; a second organic insulating layer covering the first organic insulating layer; and a second inorganic insulating layer covering the second organic insulating layer, the second inorganic insulating layer including a region in contact with the first inorganic insulating layer. An end of the first organic insulating layer and an end of the second organic insulating layer each have a tapering shape, the first organic insulating layer has a first side surface and a first bottom surface, the second organic insulating layer has a second side surface and a second bottom surface, and an angle made by the second side surface and the second bottom surface is smaller than an angle made by the first side surface and the first bottom surface.

First claim

What is claimed is:

1. A display device, comprising:
a first inorganic insulating layer covering a display region;
a first organic insulating layer on the first inorganic insulating layer;
a second organic insulating layer covering the first organic insulating layer; and
a second inorganic insulating layer covering the second organic insulating layer, the second inorganic insulating layer including a region in contact with the first inorganic insulating layer,
wherein
an end of the first organic insulating layer and an end of the second organic insulating layer each have a tapering shape,
the first organic insulating layer has a first side surface located at the end of the first organic insulating layer and a first bottom surface in direct contact with a layer below the first organic insulating layer,
the second organic insulating layer has a second side surface located at the end of the second organic insulating layer and a second bottom surface in direct contact with a layer below the second organic insulating layer, and
an angle between the second side surface and the second bottom surface is smaller than an angle between the first side surface and the first bottom surface.

2. The display device according to claim 1 , wherein the end of the second organic insulating layer is outer to the end of the first organic insulating layer.

3. The display device according to claim 1 , wherein the second organic insulating layer has a thickness smaller than a thickness of the first organic insulating layer.

4. The display device according to claim 1 , wherein the second organic insulating layer contains a compound reactive with water or oxygen.

5. The display device according to claim 4 , wherein the compound is phenolphthalein or sodium carbonate.

6. The display device according to claim 1 , wherein
the display region includes a plurality of display elements,
the display elements are each an organic EL element including a light emitting layer, and
the first inorganic insulating layer, the first organic insulating layer, the second organic insulating layer and the second inorganic insulating layer cover the plurality of display elements.

7. The display device according to claim 1 , wherein the region in contact with the first inorganic insulating layer is outer to the display region, and is at a position on a side opposite to the display region with respect to the end of the first organic insulating layer and on a side opposite to the display region with respect to the end of the second organic insulating layer.

8. A method for manufacturing a display device, the method comprising:
forming a first inorganic insulating layer such that the first inorganic insulating layer covers a display region;
forming a first organic insulating layer on the first inorganic insulating layer, the first organic insulating layer being formed of a first organic material;
forming a second organic insulating layer on the first organic insulating layer such that the second organic insulating layer covers the first organic insulating layer, the second organic insulating layer being formed of a second organic material having a viscosity lower than a viscosity of the first organic material; and
forming a second inorganic insulating layer covering the second organic insulating layer, wherein
the first organic insulating layer is cured before the second organic insulating layer is formed.

9. The method for manufacturing a display device according to claim 8 , wherein
the viscosity of the first organic material is 10 mPa·s or greater and less than 50 mPa·s, and the viscosity of the second organic material is 1 mPa·s or greater and less than 10 mPa·s.

10. The method for manufacturing a display device according to claim 8 , wherein the first organic insulating layer and the second organic insulating layer are formed by ink-jet method.

11. The method for manufacturing a display device according to claim 10 , wherein the first organic material and the second organic material are injected to different injection positions from each other.

12. The method for manufacturing a display device according to claim 8 , wherein a temperature at the time of formation of the second organic insulating layer is higher than a temperature at the time of formation of the first organic insulating layer.

13. The method for manufacturing a display device according to claim 8 , wherein a surface of the first organic insulating layer is plasma-treated before the second organic insulating layer is formed.

14. The method for manufacturing a display device according to claim 8 , wherein the first organic material and the second organic material are the same as each other.

15. The method for manufacturing a display device according to claim 8 , wherein the first organic material and the second organic material are different from each other.

16. The method for manufacturing a display device according to claim 8 , wherein
the first organic insulating layer is formed by ink-jet method, and
the second organic insulating layer is formed by vacuum vapor deposition.

Assignees

• Japan Display Inc

Inventors

• Sasaki Yusuke

Classifications

• H01L27/3244

  Electricity · mapped topic

• H01L27/3248

  Electricity · mapped topic

• H01L51/5237 Primary

  Electricity · mapped topic

• H01L27/3258

  Electricity · mapped topic

• H01L51/504

  Electricity · mapped topic