Organic EL display device

Patent metadata

Field	Value
Publication number	US-10181580-B2
Application number	US-201515533155-A
Country	US
Kind code	B2
Filing date	Dec 4, 2015
Priority date	Dec 5, 2014
Publication date	Jan 15, 2019
Grant date	Jan 15, 2019

Abstract

An organic EL display device 1 includes a flexible plastic substrate 10 , an organic EL element 4 on the plastic substrate 10 , and to sealing film 2 provided on the plastic substrate 10 to cover the organic EL element 4 . The sealing film 2 includes a first sealing layer 25 on a surface of the plastic substrate 10 , a stress relief layer 26 on a surface of the first sealing layer 25 , and a second sealing layer 27 on a surface of the stress relief layer 26 . Compressive stress of the first sealing layer 25 is lower than compressive stress of the second sealing layer 27.

First claim

The invention claimed is:

1. An organic EL display device comprising:
a flexible plastic substrate;
an organic EL element on the plastic substrate; and
a sealing film formed on the plastic substrate to cover the organic EL element,

wherein
the sealing film includes a first sealing layer on a surface of the plastic substrate, a stress relief layer on a surface of the first sealing layer, and a second sealing layer on a surface of the stress relief layer,
compressive stress of the first sealing layer is lower than compressive stress of the second sealing layer,
the stress relief layer contains an organic material,
the stress relief layer has another surface entirely provided on the first sealing layer, and
the second sealing layer covers an end of the first sealing layer and an end of the stress relief layer.

2. The organic EL display device of claim 1 , wherein
a difference between the compressive stress of the first sealing layer and the compressive stress of the second sealing layer falls within a range from 50 MPa to 300 MPa.

3. The organic EL display device of claim 1 , wherein
the second sealing layer covers the stress relief layer.

4. The organic EL display device of claim 1 , wherein
the first sealing layer is formed by plasma CVD.

5. The organic EL display device of claim 1 , wherein
the second sealing layer is formed by plasma CVD.

6. The organic EL display device of claims 1 , wherein
the stress relief layer is formed by plasma CVD.

7. The organic EL display device of claim 1 , further comprising:
another plastic substrate facing the plastic substrate;
a sealing material provided between the plastic substrate and the other plastic substrate and bonding the plastic substrate and the other plastic substrate together to encapsulate the organic EL element; and
a filler provided on the sealing film to cover the sealing film.

8. The organic EL display device of claim 1 , wherein
the sealing material is formed in a frame around the organic EL element,
the plastic substrate and a flexible upper plastic substrate are bonded together; and
an end of the sealing film is inside the sealing material.

9. The organic EL display device of claim 8 , further comprising:
a filler in the sealing material, the filler covering the sealing film and functioning as a getter.

Assignees

• Sharp Kk

Inventors

• Ishida Mamoru
• Tsuda Kazuhiko
• Ohta Yoshifumi

Classifications

• Y02E10/549

  Organic PV cells · CPC title

• G09F9/30

  in which the desired character or characters are formed by combining individual elements (panels comprising a number of electrodes in a single cell controlling light arriving from an independent light source, e.g. electro-optical or magneto-optical cell, G02F1/00) · CPC title

• H01L51/5256 Primary

  Electricity · mapped topic

• H01L27/3244

  Electricity · mapped topic

• H01L51/5259

  Electricity · mapped topic