Electroluminescence device

Patent metadata

Field	Value
Publication number	US-10340479-B2
Application number	US-201615742537-A
Country	US
Kind code	B2
Filing date	Aug 22, 2016
Priority date	Aug 27, 2015
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

In an organic EL (electroluminescence) display device including a base member, and an organic EL element disposed on the base member, the organic EL display device further includes a sealing film to seal the organic EL element. The sealing film includes two inorganic layers, and two organic layers disposed between the two inorganic layers and having infiltration rates different from each other.

First claim

The invention claimed is:

1. An electroluminescence device comprising:
a base member,
an electroluminescence element disposed on the base member, and
a sealing film to seal the electroluminescence element, wherein
the sealing film includes:
two inorganic layers, and
two organic layers disposed between the two inorganic layers,

the two organic layers are a first organic layer, and a second organic layer over the first organic layer, and
an infiltration rate of the first organic layer is higher than an infiltration rate of the second organic layer.

2. The electroluminescence device according to claim 1 , wherein, in the sealing film, one of the two inorganic layers on a side closer to the electroluminescence element, the first organic layer, and the second organic layer include widths reducing gradually.

3. The electroluminescence device according to claim 1 , wherein, in the sealing film, one of the two inorganic layers on a side closer to the electroluminescence element and the two organic layers have a same width.

4. The electroluminescence device according to claim 1 , wherein, in the sealing film, one of the two inorganic layers that is positioned on an outermost side covers the other inorganic layer and the organic layers.

5. The electroluminescence device according to claim 1 , wherein, in the sealing film, the inorganic layers and the organic layers are made of a chemical vapor deposited material.

6. The electroluminescence device according to claim 1 , wherein a difference in infiltration rate between the first organic layer and the second organic layer is within a range of 5 to 15 μm/h.

7. The electroluminescence device according to claim 1 , wherein a set of the two inorganic layers and a set of the two organic layers are each disposed in plural sets in the sealing film.

8. The electroluminescence device according to claim 1 , further comprising:
an opposing substrate positioned to face the base member on a side closer to the electroluminescence element, and
a frame-shaped sealing member that encapsulates the electroluminescence element between the base member and the opposing substrate.

9. The electroluminescence device according to claim 8 , wherein a filling material layer is disposed in a space defined by the base member, the opposing substrate, and the sealing member.

10. The electroluminescence device according to claim 1 , wherein, in the sealing film including one of the two inorganic layers on a side closer to the electroluminescence element, the first organic layer, and the second organic layer cover the first organic layer and contact the inorganic layer on the side closer to the electroluminescence element.

11. The electroluminescence device according to claim 10 , wherein, in the sealing film, a concave-convex portion is disposed in a contact region between the one of the two inorganic layers on the side closer to the electroluminescence element and the second organic layer.

12. The electroluminescence device according to claim 10 , wherein, in the sealing film, the one of the two inorganic layers on the side closer to the electroluminescence element and the second organic layer have a same width.

13. The electroluminescence device according to claim 1 , wherein
the two inorganic layers are a first inorganic layer and a second inorganic layer over the first inorganic layer,
the second organic layer covers an end portion the first organic layer and contacts the first inorganic layer, and
the second inorganic layer covers an end portion of the second organic layer.

14. The electroluminescence device according to claim 13 , wherein
the first organic layer, the second organic layer, and the first inorganic layer each include a concave-convex pattern in a contact region between the first inorganic layer and the second organic layer, and
the contact region is outside of an effective display area of the electroluminescence element.

15. The electroluminescence device according to claim 14 , further comprising an interlayer insulating film and an edge cover on the base member, wherein
the electroluminescence element includes first electrodes, organic electroluminescence layers, and a second electrode,
the first electrodes are defined between the interlayer insulating film and the edge cover,
a concave-convex portion is defined in a region of the interlayer insulating film outside the edge cover and defined outside an effective display area of the electroluminescence element, and
the concave-convex pattern is defined above the concave-convex portion.

16. The electroluminescence device according to claim 15 , wherein a concave-convex pattern of the first inorganic layer and a concave-convex pattern of the second inorganic layer are defined above the concave-convex portion.

17. The electroluminescence device according to claim 15 , wherein a thickness of the concave-convex portion changes in a direction parallel to a side of the interlayer insulating film.

18. The electroluminescence device according to claim 15 , wherein a concave-convex pattern of the second electrode is defined above the concave-convex portion.

19. The electroluminescence device according to claim 15 , wherein a thickness of the concave-convex portion changes in a direction perpendicular to a side of the interlayer insulating film.

Assignees

• Sharp Kk

Inventors

• Ishida Mamoru
• Okamoto Tetsuya
• Hirase Takeshi
• Ochi Takashi
• Senoo Tohru
• Sonoda Tohru

Classifications

• H01L51/5259

  Electricity · mapped topic

• H01L51/5256 Primary

  Electricity · mapped topic

• H01L27/3244

  Electricity · mapped topic

• H01L51/5246

  Electricity · mapped topic

• H01L27/322

  Electricity · mapped topic