Electroluminescence device and method for producing same

Patent metadata

Field	Value
Publication number	US-9954045-B2
Application number	US-201515305112-A
Country	US
Kind code	B2
Filing date	Apr 30, 2015
Priority date	May 7, 2014
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

Provided is an organic EL display device (electroluminescence device) including a TFT substrate (substrate) and an organic EL element (electroluminescence device) provided on the TFT substrate, wherein the organic EL display device includes a sealing layer that seals the organic EL element. The sealing layer is provided with a first, a second, and a third sealing film that are sequentially stacked from the organic EL element side, the first and third sealing films are each formed of an inorganic film, and the second sealing film is formed of an octamethylcyclotetrasiloxane film.

First claim

The invention claimed is:

1. An electroluminescence device comprising:
a substrate and an electroluminescence element provided on the substrate, wherein
the electroluminescence device includes a sealing layer that seals the electroluminescence element,
the sealing layer is provided with at least a first, a second, and a third sealing film that are sequentially stacked from the electroluminescence element side,
the first and third sealing films are each formed of an inorganic film,
the second sealing film is formed of an octamethylcyclotetrasiloxane film, and
in the sealing layer, a thickness of the first sealing film is smallest out of all sealing films and a thickness of the third sealing film is identical to a thickness of the second sealing film in a pixel area in which a plurality of pixels are arranged in a matrix.

2. The electroluminescence device according to claim 1 , wherein
in the sealing layer, a fourth and a fifth sealing film are sequentially stacked on the third sealing film,
the fourth sealing film is formed of an octamethylcyclotetrasiloxane film, and
the fifth sealing film is formed of an inorganic film.

3. The electroluminescence device according to claim 2 , wherein a thickness of the fourth sealing film and a thickness of the fifth sealing film are identical to the thickness of the second sealing film in the pixel area.

4. The electroluminescence device according to claim 1 , further comprising:
an opposing substrate that opposes the substrate on the electroluminescence element side; and
a frame-shaped sealing member that seals the electroluminescence element between the substrate and the opposing substrate.

5. The electroluminescence device according to claim 4 , wherein a filler layer is provided between the substrate, the opposing substrate, and the sealing member.

6. The electroluminescence device according to claim 1 , wherein a thickness of the octamethylcyclotetrasiloxane film is 50 nm or more.

7. The electroluminescence device according to claim 1 , wherein a thickness of the octamethylcyclotetrasiloxane film is greater than a thickness of the first sealing film.

8. The electroluminescence device according to claim 1 , wherein the first, second, and third sealing films become broader in this order.

9. The electroluminescence device according to claim 1 , wherein
an underlying film is provided on the substrate such that the underlying film covers an entire surface of the substrate,
a TFT, a source line, and a gate line are provided on the underlying film, and
the first, second, and third sealing films are in contact with the underlying film at a periphery of the substrate.

10. The electroluminescence device according to claim 1 , wherein
an underlying film is provided on the substrate such that the underlying film covers an entire surface of the substrate,
the electroluminescence element includes a first electrode, an EL layer, and a second electrode in this order from the substrate side, and
the second electrode is in contact with the underlying film at a periphery of the substrate.

11. A method for producing an electroluminescence device including a substrate and an electroluminescence element provided on the substrate, the method comprising:
a first sealing film formation step of forming a first sealing film that is formed of an inorganic film, is provided on the electroluminescence element, and seals the electroluminescence element;
a second sealing film formation step of forming a second sealing film that is formed of an octamethylcyclotetrasiloxane film, is provided on the first sealing film, and seals the electroluminescence element;
a third sealing film formation step of forming a third sealing film that is formed of an inorganic film, is provided on the second sealing film, and seals the electroluminescence element, wherein
a thickness of the first sealing film is smallest out of all sealing films and a thickness of the third sealing film is identical to a thickness of the second sealing film in a pixel area in which a plurality of pixels are arranged in a matrix.

12. The method for producing an electroluminescence device according to claim 11 , wherein the first and third sealing films are each formed by using a sputtering method or a CVD method.

13. The method for producing an electroluminescence device according to claim 11 , wherein the second sealing film is formed by using a CVD method.

14. The method for producing an electroluminescence device according to claim 11 , wherein
a first, a second, and a third mask are respectively used in the first, second, and third sealing film formation steps,
the first, second, and third masks are respectively provided with a first, a second, and a third opening for forming the first, second, and third sealing films, and
the first, second, and third openings become larger in this order.

Assignees

• Sharp Kk

Inventors

• Hirase Takeshi
• Okamoto Tetsuya
• Senoo Tohru
• Sonoda Tohru
• Fujiwara Seiji

Classifications

• H05B33/10

  Apparatus or processes specially adapted to the manufacture of electroluminescent light sources · CPC title

• H05B33/04

  Sealing arrangements {, e.g. against humidity} · CPC title

• H01L51/524

  Electricity · mapped topic

• H01L51/56

  Electricity · mapped topic

• H01L51/5256

  Electricity · mapped topic