Organic light-emitting display device

Patent metadata

Field	Value
Publication number	US-11069759-B2
Application number	US-201916547794-A
Country	US
Kind code	B2
Filing date	Aug 22, 2019
Priority date	Nov 19, 2018
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

An organic light-emitting display device including a substrate; a pixel in a display area of the organic light-emitting display device, the pixel being implemented by an organic light-emitting diode on the substrate; a first inclination structure surrounding the pixel; a second inclination structure at least partially surrounding the first inclination structure; and a planarization layer covering the first inclination structure and the second inclination structure and having a refractive index that is greater than a refractive index of the first inclination structure and is greater than a refractive index of the second inclination structure, wherein a height of the first inclination structure is greater than a height of the second inclination structure.

First claim

What is claimed is:

1. An organic light-emitting display device, comprising: a substrate;
a pixel in a display area of the organic light-emitting display device, the pixel being implemented by an organic light-emitting diode on the substrate;
a first inclination structure surrounding the pixel in a plan view;
a second inclination structure at least partially surrounding the first inclination structure in a plan view, and being spaced apart from the first inclination structure in a direction away from the pixel; and
a planarization layer covering the first inclination structure and the second inclination structure and having a refractive index that is greater than a refractive index of the first inclination structure and is greater than a refractive index of the second inclination structure,
wherein a height of the first inclination structure is greater than a height of the second inclination structure, and
wherein the first and second inclination structures are in the display area between the organic light-emitting diode and an adjacent organic light-emitting diode in a plan view.

2. The organic light-emitting display device as claimed in claim 1 , wherein a width of a wall of the first inclination structure is greater than a width of a wall of the second inclination structure.

3. The organic light-emitting display device as claimed in claim 1 , wherein the height of the first inclination structure is 1.2 times or greater of the height of the second inclination structure.

4. The organic light-emitting display device as claimed in claim 1 , wherein the height of the first inclination structure is 2.5 μm or greater.

5. The organic light-emitting display device as claimed in claim 1 , wherein a horizontal separation distance along a top surface of the substrate between an edge of the pixel and an inner edge of the first inclination structure is about 0.5 μm to about 1.5 μm.

6. The organic light-emitting display device as claimed in claim 1 , further comprising a third inclination structure at least partially surrounding the second inclination structure,
wherein the height of the second inclination structure is substantially the same as a height of the third inclination structure.

7. The organic light-emitting display device as claimed in claim 1 , further comprising a third inclination structure at least partially surrounding the second inclination structure,
wherein the height of the second inclination structure is greater than a height of the third inclination structure.

8. The organic light-emitting display device as claimed in claim 1 , wherein the first inclination structure has a closed loop shape, and
wherein the second inclination structure has a closed loop shape.

9. The organic light-emitting display device as claimed in claim 1 , wherein a cross-sectional shape of the first inclination structure has a tapered inclination, and
wherein an angle θ of the tapered inclination satisfies the following equation:

θ
>

sin

-
1

⁡

(

n
1

n
2

)

,

in which n 1 is a refractive index of the first inclination structure and n 2 is a refractive index of the planarization layer.

10. The organic light-emitting display device as claimed in claim 1 , further comprising a thin-film encapsulation layer covering the organic light-emitting diode on the substrate, the thin-film encapsulation layer including a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer,
wherein the first inclination structure and the second inclination structure are on the thin-film encapsulation layer.

11. The organic light-emitting display device as claimed in claim 10 , further comprising a dam in a peripheral area of the organic light-emitting display device that is around the display area,
wherein the first inorganic encapsulation layer and the second inorganic encapsulation layer directly contact each other outside the dam.

12. An organic light-emitting display device, comprising:
a substrate;
a pixel in a display area of the organic light-emitting display device, the pixel being implemented by an organic light-emitting diode on the substrate;
a first inclination structure surrounding the pixel;
a second inclination structure at least partially surrounding the first inclination structure;
a planarization layer covering the first inclination structure and the second inclination structure and having a refractive index that is greater than a refractive index of the first inclination structure and is greater than a refractive index of the second inclination structure;
a thin-film encapsulation layer covering the organic light-emitting diodes on the substrate, the thin-film encapsulation layer including a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer; and
a touchscreen layer on the thin-film encapsulation layer,
wherein a height of the first inclination structure is greater than a height of the second inclination structure, and
wherein the first inclination structure and the second inclination structure are on the touchscreen layer.

13. An organic light-emitting display device, comprising:
a substrate;
an organic light-emitting diode in a display area of the organic light-emitting display device, the organic light-emitting diode including a pixel electrode, an intermediate layer, and an opposite electrode;
a pixel-defining layer covering edges of the pixel electrode and defining an emission area through an opening that exposes a central portion of the pixel electrode;
a thin-film encapsulation layer covering the organic light-emitting diode and including at least one organic encapsulation layer and at least one inorganic encapsulation layer;
a plurality of inclination structures on the thin-film encapsulation layer and at least partially surrounding the opening, such that the inclination structures are in the display area between the organic light-emitting diode and an adjacent organic light-emitting diode in a plan view; and
a planarization layer covering the plurality of inclination structures,
wherein a height of a first inclination structure that is closest to the emission area among the plurality of inclination structures is greater than heights of other inclination structures of the plurality of inclination structures.

14. The organic light-emitting display device as claimed in claim 13 , wherein the plurality of inclination structures include a second inclination structure surrounding the first inclination structure, and
wherein the height of the first inclination structure is 1.2 times or greater of a height of the second inclination structure.

15. The organic light-emitting display device as claimed in claim 13 , wherein a refractive index of each of the plurality of inclination structures is about 1.4 to about 1.55, and
wherein a refractive index of the planarization layer is about 1.6

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Woongsik
• Byun Jinsu
• Sugitani Koichi
• Cha Gwangmin
• Han Saehee

Classifications

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K59/40 Primary

  OLEDs integrated with touch screens · CPC title

• H10K59/873 Primary

  Encapsulations · CPC title

• H10K59/8731

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

• H10K59/879 Primary

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