Display device

Patent metadata

Field	Value
Publication number	US-2025351711-A1
Application number	US-202519022967-A
Country	US
Kind code	A1
Filing date	Jan 15, 2025
Priority date	May 9, 2024
Publication date	Nov 13, 2025
Grant date	—

Abstract

A display device according to one or more embodiments of the present disclosure includes: a substrate; a light-emitting element on the substrate; a multi-capping layer comprising a first capping layer on the light-emitting element and having a first refractive index, and a second capping layer on the first capping layer and having a second refractive index lower than the first refractive index; a low refractive layer on the multi-capping layer, and having a third refractive index lower than the second refractive index; and a first encapsulation layer on the low refractive layer, and comprising inorganic encapsulation layers having a refractive index higher than the third refractive index.

First claim

What is claimed is:

1 . A display device comprising:
a substrate; a light-emitting element on the substrate; a multi-capping layer comprising a first capping layer on the light-emitting element and having a first refractive index, and a second capping layer on the first capping layer and having a second refractive index lower than the first refractive index; a low refractive layer on the multi-capping layer, and having a third refractive index lower than the second refractive index; and a first encapsulation layer on the low refractive layer, and comprising inorganic encapsulation layers having a refractive index higher than the third refractive index.

2 . The display device of claim 1 , wherein the first refractive index has a value in a range of about 1.2 to about 3.0, and
wherein the second refractive index has a value in a range of about 1.0 to about 2.8.

3 . The display device of claim 1 , wherein a difference between the first refractive index and the second refractive index is about 0.2 or more.

4 . The display device of claim 1 , wherein a difference between the second refractive index and the third refractive index is about 0.2 or more.

5 . The display device of claim 1 , wherein the first capping layer has a thickness ranging from about 200 Å to about 1400 Å.

6 . The display device of claim 1 , wherein the second capping layer has a thickness ranging from about 50 Å to about 1000 Å.

7 . The display device of claim 1 , wherein the low refractive layer has a thickness ranging from about 200 Å to about 1000 Å.

8 . The display device of claim 1 , wherein the first encapsulation layer comprises:
a first inorganic encapsulation layer on the low refractive layer, and having a fourth refractive index higher than the third refractive index; a second inorganic encapsulation layer on the first inorganic encapsulation layer, and having a fifth refractive index lower than the fourth refractive index; and a third inorganic encapsulation layer on the second inorganic encapsulation layer, and having a sixth refractive index lower than the fifth refractive index.

9 . The display device of claim 8 , wherein the first inorganic encapsulation layer comprises silicon nitride (SiN x ).

10 . The display device of claim 8 , wherein the second inorganic encapsulation layer and the third inorganic encapsulation layer contain silicon oxynitride (SiON), and
wherein a content of nitrogen contained in the second inorganic encapsulation layer and a content of nitrogen contained in the third inorganic encapsulation layer are different from each other.

11 . The display device of claim 1 , further comprising:
a second encapsulation layer on the first encapsulation layer and containing an organic material; and a third encapsulation layer on the second encapsulation layer and containing an inorganic material.

12 . The display device of claim 11 , further comprising:
a fourth encapsulation layer between the first encapsulation layer and the second encapsulation layer, wherein the fourth encapsulation layer comprises silicon oxynitride (SiON), and wherein a content of oxygen contained in the fourth encapsulation layer is higher than a content of oxygen contained in the first encapsulation layer.

13 . The display device of claim 1 , wherein the light-emitting element comprises:
a first electrode on the substrate; an intermediate layer on the first electrode and comprising a light-emitting layer; and a second electrode on the intermediate layer.

14 . The display device of claim 13 , wherein the first capping layer is directly on the second electrode, and
wherein the second capping layer is directly on the first capping layer.

15 . The display device of claim 14 , wherein the low refractive layer is directly on the second capping layer.

16 . The display device of claim 13 , wherein the multi-capping layer further comprises a third capping layer between the second electrode and the first capping layer and having a refractive index lower than the first refractive index.

17 . The display device of claim 16 , wherein the refractive index of the third capping layer has a value in a range of about 1.0 to about 2.8.

18 . The display device of claim 16 , wherein a difference between the refractive index of the third capping layer and the first refractive index is about 0.2 or more.

19 . The display device of claim 16 , wherein the third capping layer has a thickness ranging from about 50 Å to about 1000 Å.

20 . The display device of claim 16 , wherein the multi-capping layer further comprises at least one of:
a fourth capping layer between the first capping layer and the second capping layer, and having a refractive index that gradually decreases as it approaches the second capping layer in a range greater than or equal to the second refractive index and less than or equal to the first refractive index; or a fifth capping layer between the third capping layer and the first capping layer, and having a refractive index that gradually increases as it approaches the first capping layer in a range greater than or equal to the refractive index of the third capping layer and less than or equal to the first refractive index.

21 . A display device comprising:
a substrate; a light-emitting element on the substrate; a multi-capping layer comprising a first capping layer on the light-emitting element and having a first refractive index, and a second capping layer on the first capping layer and having a second refractive index different from the first refractive index; a low refractive layer on the multi-capping layer, and having a third refractive index lower than the first refractive index and the second refractive index; and a first encapsulation layer on the low refractive layer, and comprising an inorganic encapsulation layer having a refractive index higher than the third refractive index.

22 . The display device of claim 21 , wherein a difference between the first refractive index and the second refractive index is about 0.2 or more.

23 . The display device of claim 21 , wherein a difference between the second refractive index and the third refractive index is about 0.2 or more.

24 . The display device of claim 21 , wherein the first encapsulation layer comprises:
a first inorganic encapsulation layer on the low refractive layer, and having a fourth refractive index higher than the third refractive index; a second inorganic encapsulation layer on the first inorganic encapsulation layer, and having a fifth refractive index lower than the fourth refractive index; and a third inorganic encapsulation layer on the second inorganic encapsulation layer, and having a sixth refractive index lower than the fifth refractive index.

25 . The display device of claim 21 , further comprising:
a second encapsulation layer on the first encapsulation layer and containing an organic material; and a third encapsulation layer on the second encapsulation layer and containing an inorganic material.

26 . An electronic device for providing an image, comprising:
a display device comprising:
a substrate;
a light-emitting element on the substrate;
a multi-capping layer comprising a first capping layer on the light-emitting element and having a first refractive index, and a second capping layer on the first capping layer and having a second refractive index lower th

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Dal Ho
• Kim Ji Young
• Kim Ji Hye
• Park Eun Ji
• Sung Hyang Ki
• Jeong Hee Seong
• Han Jong Seok

Classifications

• H10K2102/351

  Thickness · CPC title

• H10K59/873 Primary

  Encapsulations · CPC title

• H10K59/879 Primary

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

• H10K59/8731

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