Organic light-emitting diode display device

Patent metadata

Field	Value
Publication number	US-12052885-B2
Application number	US-202117212003-A
Country	US
Kind code	B2
Filing date	Mar 25, 2021
Priority date	Jul 6, 2016
Publication date	Jul 30, 2024
Grant date	Jul 30, 2024

Abstract

An display device including a substrate, an organic light-emitting diode, and a thin film encapsulation layer. The organic light-emitting diode is disposed on the substrate. The thin film encapsulation layer is disposed on the organic light-emitting diode. The thin film encapsulation layer includes at least one inorganic layer, at least one organic layer, and a first refractive-index control layer. The at least one organic layer is alternately disposed with the at least one inorganic layer. The first refractive-index layer is disposed between one of the at least one inorganic layer and one of the at least one organic layer disposed adjacent to each other. The first refractive-index control layer has a refractive-index variation ratio per unit length (Δn/nm) from about 0.001/nm to about 0.002/nm along a direction from the organic light-emitting diode toward the thin film encapsulation layer.

First claim

The invention claimed is:

1. A display device, comprising:
a substrate;
an organic light-emitting diode disposed on the substrate, the organic light-emitting diode including a first electrode, an organic light-emitting layer disposed on the first electrode, and a second electrode disposed on the organic light-emitting layer; and
a thin film encapsulation layer disposed on the organic light-emitting diode,
wherein the thin film encapsulation layer comprises:
a first inorganic layer;
a first refractive-index control layer disposed directly above the first inorganic layer;
a second refractive-index control layer disposed directly below the first inorganic layer, wherein each of the first and second refractive-index control layers includes a plurality of matching layers;
an organic layer disposed on an upper surface of the first inorganic layer, the organic layer having a lower surface disposed above the first inorganic layer and an upper surface opposite to the lower surface, and
a second inorganic layer disposed on the organic layer, the second inorganic layer having a higher refractive index than a refractive index of the organic layer,
a capping layer disposed between the first inorganic layer and the organic light-emitting diode, the capping layer directly contacting an entirety of a lower surface of the second refractive-index control layer and an entirety of an upper surface of the second electrode, wherein the capping layer includes a high refractive-index material and a low refractive-index material,
the first inorganic layer and the organic layer form an interface between the first inorganic layer and the organic layer,
the first inorganic layer and the or organic layer have a refractive-index difference of about 0.15 or less, and
the first inorganic layer and the second inorganic layer are comprised of a substantially same material as each other.

2. The display device of claim 1 , wherein the first inorganic layer and the organic layer have a refractive-index difference of about 0.06 or less.

3. The display device of claim 1 , wherein the thin film encapsulation layer has a thickness of about 50 μm or less.

4. The display device of claim 1 , wherein the first inorganic layer has a thickness of from about 100 nm to about 1,000 nm.

5. The display device of claim 1 , wherein the first inorganic layer includes silver, metal oxide, metal oxynitride, silicon oxide, silicon nitride, silicon oxynitride, or any combination thereof.

6. The display device of claim 1 , wherein the first inorganic layer has a refractive index from about 1.6 to about 2.8.

7. The display device of claim 6 , wherein the refractive index of the organic layer is in a range from about 1.4 to about 1.6.

8. The display device of claim 1 , wherein the first inorganic layer has a refractive index from about 1.6 to about 1.75.

9. The display device of claim 1 , wherein the first inorganic layer has a refractive index of about 1.75.

10. The display device of claim 1 , wherein the refractive index of the organic layer is in a range from about 1.4 to 1.6.

11. The display device of claim 1 , wherein the refractive index of the organic layer is about 1.5.

12. The display device of claim 1 ,
wherein the second inorganic layer and the organic layer form an interface between the second inorganic layer and the organic layer, and
wherein the second inorganic layer has a refractive index from about 1.6 to about 2.8.

13. The display device of claim 1 , wherein the second inorganic layer comprises at least one compound selected from Al 2 O 3 , TiO 2 , ZrO, SiO 2 , AlON, AlN, SiON, Si 3 N 4 , ZnO, and Ta 2 O 5 .

14. The display device of claim 1 , wherein the organic layer comprises at least one compound selected from: 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), and 3-(4-biphenyl)-4-phenyl-5-t-butylphenyl-1,2,4-triazole (TAZ).

15. The display device of claim 1 , wherein the capping layer overlaps an entire portion of the organic layer.

Assignees

• Samsung Display Co Ltd

Inventors

• Yim Sanghoon
• Kim Wonjong
• Kim Yisu
• Oh Minho
• Yun Wonmin
• Lee Kwanhee
• Lee Byoungduk
• Cho Yoonhyeung
• Joo Youngcheol
• Ju Yongchan

Classifications

• H10K50/858 Primary

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

• H10K50/8445 Primary

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

• H10K59/8731

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

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K59/879 Primary

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