Display device

Patent metadata

Field	Value
Publication number	US-10497901-B2
Application number	US-201816209171-A
Country	US
Kind code	B2
Filing date	Dec 4, 2018
Priority date	Dec 5, 2014
Publication date	Dec 3, 2019
Grant date	Dec 3, 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 a 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. A display device comprising:
a flexible plastic substrate;
an electroluminescence element disposed on the plastic substrate; and
a sealing film disposed on the electroluminescence element, wherein
the sealing film includes a first inorganic layer disposed on the electroluminescence element, an organic layer disposed on the first inorganic layer, and a second inorganic layer disposed on the organic layer,
compressive stress of the first inorganic layer is lower than compressive stress of the second inorganic layer,
the organic layer has another surface entirely disposed on the first inorganic layer, and
the second inorganic layer covers an end of the first inorganic layer and an end of the organic layer.

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

3. The display device of claim 1 , wherein
the second inorganic layer covers the organic layer.

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

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

6. The display device of claim 1 , wherein
the organic layer is formed by plasma CVD.

7. The 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 electroluminescence element; and
a filler provided on the sealing film to cover the sealing film.

8. The display device of claim 1 , wherein
the sealing material is formed in a frame around the electroluminescence 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 display device of claim 8 , further comprising:
a filler in the sealing material, the filler covering the sealing film and functioning as a getter.

10. The display device of claim 1 , wherein
the electroluminescence element includes, in an order of, a first electrode, a light-emitting layer, and a second electrode from the plastic substrate.

11. The display device of claim 10 , wherein
the first electrode includes at least any one of silver, aluminum, indium tin oxide, or indium zinc oxide.

12. The display device of claim 11 , wherein
the first electrode is a multilayer.

13. The display device of claim 10 , wherein
the second electrode includes at least any one of silver, aluminum, indium tin oxide, or indium zinc oxide.

14. The display device of claim 13 , wherein
the second electrode is a multilayer.

15. The display device of claim 1 , wherein
the electroluminescence element further includes a hole injection layer including any one of: triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, phenylenediamine derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, or stilbene derivatives.

16. The display device of claim 1 , wherein
the electroluminescence element further includes an electron transport layer including any one of: oxadiazole derivatives, triazole derivatives, benzoquinone derivatives, naphthoquinone derivatives, anthraquinone derivatives, tetracyanoanthraquinodimethan derivatives, diphenoquinone derivatives, fluorenone derivatives, silole derivatives, or metal oxinoid compounds.

17. The display device of claim 1 , wherein
the electroluminescence element further includes an electron injection layer including any one of: lithium fluoride, magnesium fluoride, calcium fluoride, strontium fluoride, barium fluoride, Al 2 O 3 , or SrO.

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

• H01L27/3244

  Electricity · mapped topic

• H01L51/5256 Primary

  Electricity · mapped topic

• H01L2251/5338

  Electricity · mapped topic