Organic light-emitting diode display device including a thin film encapsulation layer

Patent metadata

Field	Value
Publication number	US-11329257-B2
Application number	US-202016810107-A
Country	US
Kind code	B2
Filing date	Mar 5, 2020
Priority date	Sep 20, 2016
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A display device includes: a substrate; an organic light-emitting diode positioned above the substrate; and a thin film encapsulation layer disposed on the organic light-emitting diode. The thin film encapsulation layer includes: at least one inorganic layer; and at least one organic layer disposed on the at least one inorganic layer. The at least one organic layer has a refractive index of about 1.66 or greater.

First claim

What is claimed is:

1. A display device, comprising:
a substrate;
an organic light-emitting diode positioned above the substrate;
a thin film encapsulation layer disposed on the organic light-emitting diode; and
a capping layer disposed between the organic light-emitting diode and the thin film encapsulation layer,
wherein the capping layer has a refractive index in a range from about 1.3 to about 1.4,
wherein the thin film encapsulation layer comprises:
at least one inorganic layer; and
at least one organic layer disposed on the at least one inorganic layer,
wherein the at least one inorganic layer and the at least one organic layer have a refractive index difference of about 0.06 or less.

2. The display device of claim 1 , wherein the at least one organic layer has a refractive index in a range of from about 1.66 to about 2.8.

3. The display device of claim 1 , wherein the at least one inorganic layer has a refractive index in a range of from about 1.6 to about 2.8.

4. The display device of claim 1 , wherein the at least one organic layer is formed by polymerization of at least one monomer selected from: pentabromophenyl acrylate, 2-(9H-carbazol-9-yl) ethyl methacrylate, N-vinylcarbazole, bis (methacryloylthiophenyl) sulfide or zirconium acrylate.

5. The display device of claim 1 , wherein the at least one organic layer comprises at least one of: poly(3,4-ethylenedioxythiophene) (PEDOT), 4,4′-bis[N-(3-methylphenyl)-N-phenylamino]biphenyl (TPD), 4,4′,4″-tris[(3-methylphenyl)phenylamino] triphenylamine (m-MTDATA), 1,3,5-tris[N,N-bis(2-methylphenyl)-amino]benzene (o-MTDAB), 1,3,5-tris[N,N-bis(3-methylphenyl)-amino]benzene (m-MTDAB), 1,3,5-tris[N,N-bis(4-methylphenyl)amino]benzene (p-MTDAB), 4,4′-bis[N,N-bis(3-methylphenyl)-amino] diphenylmethane (BPPM), 4,4-dicarbazolyl-1,1′-biphenyl (CBP), 4,4′,4″-tris(N-carbazole) triphenylamine (TCTA), 2,2′,2″-(1,3,5-benzenetolyl)tris-[1-phenyl-1H-benzoimidazol] (TPBI) or 3-(4-biphenyl)-4-phenyl-5-t-butylphenyl-1,2,4-triazole (TAZ).

6. The display device of claim 1 , wherein the at least one inorganic layer comprises a first inorganic layer and a second inorganic layer, and
the at least one organic layer comprises a first organic layer disposed between the first inorganic layer and the second inorganic layer.

7. The display device of claim 1 , wherein the thin film encapsulation layer comprises:
at least two inorganic layers; and
at least two organic layers alternatingly disposed with the at least two inorganic layers,
wherein the at least two inorganic layers and the at least two organic layers have a refractive index difference of about 0.06 or less.

8. The display device of claim 1 , wherein the organic light-emitting diode comprises:
a first electrode disposed on the substrate;
an organic light-emitting layer disposed on the first electrode; and
a second electrode disposed on the organic light-emitting layer.

9. The display device of claim 8 , wherein the organic light-emitting diode comprises at least one of a hole injection layer and a hole transport layer disposed between the first electrode and the organic light-emitting layer, and at least one of an electron transport layer and an electron injection layer disposed between the organic light-emitting layer and the second electrode.

10. The display device of claim 1 , further comprising a low refractive index layer disposed between the capping layer and the thin film encapsulation layer.

11. The display device of claim 10 , wherein the low refractive index layer has a refractive index in a range of from about 1.3 to about 1.4.

12. The display device of claim 10 , wherein the low refractive index layer comprises lithium fluoride (LiF).

13. A display device, comprising:
a substrate;
an organic light-emitting diode positioned above the substrate; and
a thin film encapsulation layer disposed on the organic light-emitting diode,
wherein the thin film encapsulation layer comprises:
at least one inorganic layer; and
at least one organic layer disposed on the at least one inorganic layer,
wherein the at least one organic layer has a refractive index of about 1.66 or greater,
wherein the at least one organic layer is formed by polymerization of at least one monomer selected from: pentabromophenyl acrylate, 2-(9H-carbazol-9-yl) ethyl methacrylate, N-vinylcarbazole, bis (methacryloylthiophenyl) sulfide or zirconium acrylate.

14. The display device of claim 13 , wherein the at least one organic layer comprises at least one of: poly(3,4-ethylenedioxythiophene) (PEDOT), 4,4′-bis[N-(3-methylphenyl)-N-phenylamino]biphenyl (TPD), 4,4′,4″-tris[(3-methylphenyl)phenylamino] triphenylamine (m-MTDATA), 1,3,5-tris[N,N-bis(2-methylphenyl)-amino]benzene (o-MTDAB), 1,3,5-tris[N,N-bis(3-methylphenyl)-amino]benzene (m-MTDAB), 1,3,5-tris[N,N-bis(4-methylphenyl)amino]benzene (p-MTDAB), 4,4′-bis[N,N-bis(3-methylphenyl)-amino]diphenylmethane (BPPM), 4,4-dicarbazolyl-1,1′-biphenyl (CBP), 4,4′,4″-tris(N-carbazole) triphenylamine (TCTA), 2,2′,2″-(1,3,5-benzenetolyl)tris-[1-phenyl-1H-benzoimidazol] (TPBI) or 3-(4-biphenyl)-4-phenyl-5-t-butylphenyl-1,2,4-triazole (TAZ).

15. The display device of claim 13 ,
wherein the organic light-emitting diode comprises:
a first electrode disposed on the substrate; and
an organic light-emitting layer disposed on the first electrode,
wherein the display device further comprises a first light emission auxiliary layer disposed between the first electrode and the organic light-emitting layer.

16. The display device of claim 15 , wherein the organic light-emitting diode further comprises a second electrode disposed on the organic light-emitting layer,
wherein the display device further comprises a second light emission auxiliary layer disposed between the organic light-emitting layer and the second electrode.

17. A display device, comprising:
a substrate;
an organic light-emitting diode positioned above the substrate; and
a thin film encapsulation layer disposed on the organic light-emitting diode,
wherein the thin film encapsulation layer comprises:
at least one inorganic layer; and
at least one organic layer disposed on the at least one inorganic layer,
wherein the at least one inorganic layer and the at least one organic layer have a refractive index difference of about 0.06 or less,
wherein the at least one organic layer is formed by polymerization of at least one monomer selected from: pentabromophenyl acrylate, 2-(9H-carbazol-9-yl) ethyl methacrylate, N-vinylcarbazole, bis (methacryloylthiophenyl) sulfide or zirconium acrylate.

18. The display device of claim 17 , wherein the at least one organic layer comprises at least one of: poly(3,4-ethylenedioxythiophene) (PEDOT), 4,4′-bis[N-(3-methylphenyl)-N-phenylamino]biphenyl (TPD), 4,4′,4″-tris[(3-methylphenyl)phenylamino] triphenylamine (m-MTDATA), 1,3,5-tris[N,N-bis(2-methylphenyl)-amino]benzene (o-MTDAB), 1,3,5-tris[N,N-bis(3-methylphenyl)-amino]benzene (m-MTDAB), 1,3,5-tris[N,N-bis(4-methylphenyl)amino]benzene (p-MTDAB), 4,4′-bis[N,N-bis(3-methylphenyl)-amino]diphenylmethane (BPPM), 4,4-dicarbazolyl-1,1′-biphenyl (CBP), 4,4′,4″-tris(N-carbazole) triphenylamine (TCTA), 2,2′,2″-(1,3,5-benzenetolyl)tris-[1-phenyl-1H-benzoimidazol] (TPBI) or 3-(4-biphenyl)-4-phenyl-5-t-butylphenyl-1,2,4-triazole (TAZ).

19. The display device of claim 17 ,
wherein the organic light-emitting diode comprises:
a first electrode disposed on the substrate; and
an organic light-emitting layer disposed on the first electrode,
wherein the display device further compr

Assignees

• Samsung Display Co Ltd

Inventors

• Ju Yongchan
• Kim Yisu
• Park Eungseok
• Yun Wonmin
• Lee Byoungduk
• Cho Yoonhyeung

Classifications

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title

• H10K50/171

  Electron injection layers · CPC title

• H10K50/17

  Carrier injection layers · CPC title

• H10K50/8445

  multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers · CPC title

• H10K50/858 Primary

  comprising refractive means, e.g. lenses · CPC title