Display device and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2018375062-A1
Application number	US-201816003116-A
Country	US
Kind code	A1
Filing date	Jun 8, 2018
Priority date	Jun 26, 2017
Publication date	Dec 27, 2018
Grant date	—

Abstract

A display device includes a first substrate, a sealing layer located along an edge of the first substrate, a second substrate coupled with the first substrate via the sealing layer, a display part located on the second main surface and within a sealed space, and a filler filling the sealed space and including a particle solid drying agent dispersed therein. The display part includes an organic EL element located on the second substrate, the organic EL element including a first electrode, an organic EL layer, and a second electrode stacked in order from the second substrate. Additionally, the display part includes an organic sacrifice layer located on and in contact with the second electrode, and a first inorganic protective layer located on and in contact with the organic sacrifice layer. The filler is located between the first inorganic protective layer and the first substrate.

First claim

What is claimed is:

1 . A display device comprising:
a first substrate including a first main surface; a frame-shaped sealing layer located on the first main surface and along an edge of the first substrate; a second substrate coupled with the first substrate via the sealing layer, the second substrate including a second main surface facing the first main surface; a display part located on the second main surface and within a sealed space surrounded and sealed by the first substrate, the sealing layer, and the second substrate; and a filler located in the sealed space and including a particle solid drying agent dispersed therein, wherein the display part comprises:
an organic EL element located on the second main surface, the organic EL element including a first electrode, an organic EL layer, and a second electrode stacked in order from the second main surface;
an organic sacrifice layer in contact with the second electrode; and
an inorganic protective layer in contact with the organic sacrifice layer, and
wherein the filler is located between the inorganic protective layer and the first substrate.

2 . The display device according to claim 1 ,
wherein the organic sacrifice layer comprises at least one organic material included in the organic EL layer.

3 . The display device according to claim 1 ,
wherein the inorganic protective layer comprises a conductive layer constituted by a conductive material included in the second electrode.

4 . The display device according to claim 1 ,
wherein the inorganic protective layer comprises at least one layer selected from a silicon oxide layer, a silicon nitride oxide layer, a silicon nitride layer, a titanium oxide layer, and an aluminum oxide layer.

5 . The display device according to claim 1 ,
wherein the solid drying agent includes an alkali earth metal oxide or an alkali earth metal chloride.

6 . The display device according to claim 1 , further comprising:
a second inorganic protective layer covering the display part, wherein the filler is located between the second inorganic protective layer and the first substrate.

7 . The display device according to claim 1 ,
wherein a thickness of the organic sacrifice layer is not less than 10 nm and not more than 200 nm.

8 . The display device according to claim 1 ,
wherein a thickness of the inorganic protective layer is not less than 50 nm and not more than 300 nm.

9 . The display device according to claim 1 , further comprising a layer interposed between the second substrate and the organic EL element.

10 . A display device comprising:
a first substrate; a sealing layer located along an edge of the first substrate; a second substrate coupled with the first substrate via the sealing layer; a display part located within a sealed space surrounded and sealed by the first substrate, the sealing layer, and the second substrate; and a filler located in the sealed space and including a particle solid drying agent dispersed therein, wherein the display part comprises:
a light emitting element,
an organic sacrifice layer located on the light emitting element; and
an inorganic protective layer located on the organic sacrifice layer, and
wherein the organic sacrifice layer and the inorganic protective layer are interposed between the light emitting element and the filler.

11 . The display device according to claim 10 ,
wherein the light emitting element comprises an organic EL element, and wherein the organic sacrifice layer includes at least one organic material included in the organic EL element.

12 . The display device according to claim 10 ,
wherein the inorganic protective layer comprises a conductive layer constituted by a conductive material included in the light emitting element.

13 . The display device according to claim 10 , further comprising:
a second inorganic protective layer covering the display part, wherein the organic sacrifice layer, the inorganic protective layer, and the second inorganic protective layer are interposed between the light emitting element and the filler.

14 . The display device according to claim 10 ,
wherein the light emitting element includes a first electrode, a second electrode, and an organic EL layer interposed between the first electrode and the second electrode.

15 . The display device according to claim 10 , further comprising a reinforcing film interposed between the second substrate and the light emitting element, wherein the reinforcing film comprises a silicon compound or an oxide compound.

16 . The display device according to claim 10 , wherein the light emitting element comprises an organic EL element, and wherein the organic sacrifice layer is in contact with the organic EL element.

17 . The display device according to claim 16 , wherein the inorganic protective layer is in contact with the organic sacrifice layer.

18 . A method of manufacturing a display device, comprising:
forming a sealing layer along an edge of a first substrate; forming a light emitting element on a second substrate; forming an organic sacrifice layer on the light emitting element; forming an inorganic protective layer on the organic sacrifice layer; depositing a filler on the first substrate, wherein the filler includes a particle solid drying agent dispersed therein; and sealing the first substrate to the second substrate via the sealing layer to form a sealed space which encloses the filler.

19 . The method according to claim 18 , wherein forming the light emitting element comprises:
forming a first electrode on the second substrate; forming an organic EL layer on the first electrode; and forming a second electrode on the organic EL layer, wherein the organic sacrifice layer is in contact with the second electrode, and wherein the inorganic protective layer is in contact with the organic sacrifice layer.

20 . The method according to claim 18 , wherein the filler is deposited on the first substrate within a frame shaped seal of the sealing layer by a drop filling method, and wherein sealing the first substrate to the second substrate comprises:
placing the second substrate against the sealing layer in a low pressure or vacuum state; and decreasing a distance between the first substrate and the second substrate, causing the filler to spread throughout the sealed space.

Assignees

• Futaba Denshi Kogyo Kk

Inventors

• Ide Shinji
• Niiyama Takahiro
• Kodama Mitsufumi

Classifications

• H01L51/5253 Primary

  Electricity · mapped topic

• H01L51/56

  Electricity · mapped topic

• H01L27/3283

  Electricity · mapped topic

• H01L51/5246

  Electricity · mapped topic

• H01L2251/5392

  Electricity · mapped topic