Display apparatus

Patent metadata

Field	Value
Publication number	US-12538660-B2
Application number	US-202217974198-A
Country	US
Kind code	B2
Filing date	Oct 26, 2022
Priority date	Dec 27, 2021
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

A display apparatus includes a substrate, a first electrode disposed on the substrate, a bank layer overlapping an edge of the first electrode and defining an opening in the bank layer which corresponds to the first electrode, a protrusion portion disposed on the bank layer and is spaced apart from the opening in the bank layer, the protrusion portion having a reverse-tapered structure in a cross-sectional view, an emission layer overlapping the first electrode through the opening, and a second electrode disposed on the emission layer and the protrusion portion, wherein a thickness of the second electrode decreases from a top surface of the protrusion portion toward a bottom surface of the protrusion portion on a side surface of the protrusion portion.

First claim

What is claimed is:

1 . A display apparatus comprising:
a substrate; a first electrode disposed on the substrate; a bank layer overlapping an edge of the first electrode and defining an opening in the bank layer which corresponds to the first electrode; a protrusion portion disposed on the bank layer and is spaced apart from the opening in the bank layer, the protrusion portion having a reverse-tapered structure in a cross-sectional view; a point at which the bank layer meets the protrusion portion; an emission layer overlapping the first electrode through the opening in the bank layer; and a second electrode disposed on the emission layer and the protrusion portion, wherein a thickness of the second electrode decreases from a top surface of the protrusion portion toward a bottom surface of the protrusion portion on a side surface of the protrusion portion, and the second electrode defines an opening adjacent to the point, the opening in the second electrode exposing a portion of the bank layer or the protrusion portion.

2 . The display apparatus of claim 1 , further comprising an encapsulation layer on the second electrode,
wherein the encapsulation layer includes a first inorganic encapsulation layer disposed on the second electrode, a second inorganic encapsulation layer disposed on the first inorganic encapsulation layer, and an organic encapsulation layer located between the first inorganic encapsulation layer and the second inorganic encapsulation layer.

3 . The display apparatus of claim 2 , wherein the first inorganic encapsulation layer defines an opening exposing the top surface of the protrusion portion.

4 . The display apparatus of claim 1 , wherein the opening in the second electrode exposes a bottom portion of the side surface of the protrusion portion.

5 . The display apparatus of claim 1 , wherein the opening in the second electrode exposes a portion of the top surface of the bank layer which is adjacent to a bottom portion of the side surface of the protrusion portion.

6 . The display apparatus of claim 1 , wherein within the second electrode, an oxygen concentration of a portion covering the protrusion portion is greater than an oxygen concentration of a portion covering the emission layer.

7 . The display apparatus of claim 1 , further comprising a sub protrusion portion disposed on the bank layer,
wherein the sub protrusion portion has a smaller thickness than the protrusion portion.

8 . The display apparatus of claim 7 , wherein at least a portion of the sub protrusion portion is located between the protrusion portion and the opening of the bank layer.

9 . The display apparatus of claim 7 , wherein in a plan view, the protrusion portion and the sub protrusion portion have a closed shape, and the sub protrusion portion surrounds the protrusion portion.

10 . The display apparatus of claim 9 , wherein the sub protrusion portion has a circular closed shape in the plan view.

11 . An electronic apparatus comprising:
a display apparatus comprising:
a substrate;
a bank layer disposed on the substrate and defining a light emission area and a non-light emission area;
a light emitting device arranged in the emission area and including a first electrode, an emission layer on the first electrode, and a second electrode on the emission layer;
a protrusion portion arranged in the non-light emission area of the bank layer; and
a point at which the bank layer meets the protrusion portion,
wherein
the protrusion portion has a shape increasing in width away from the substrate,
the second electrode is disposed on the protrusion portion and defines an opening adjacent to the point, the opening exposing a portion of the bank layer or the protrusion portion, and
a thickness of a portion of the second electrode disposed on a side surface of the protrusion portion decreases toward a bottom surface of the protrusion portion.

12 . The electronic apparatus of claim 11 , wherein the display apparatus further comprises an encapsulation layer which covers the light emitting device and the protrusion portion,
wherein the encapsulation layer includes a first inorganic encapsulation layer disposed on the second electrode, a second inorganic encapsulation layer disposed on the first inorganic encapsulation layer, and an organic encapsulation layer located between the first inorganic encapsulation layer and the second inorganic encapsulation layer.

13 . The electronic apparatus of claim 12 , wherein the first inorganic encapsulation layer defines an opening exposing a top surface of the protrusion portion.

14 . The electronic apparatus of claim 11 , wherein the opening exposes a bottom portion of the side surface of the protrusion portion.

15 . The electronic apparatus of claim 11 , wherein the opening exposes the top surface of the bank layer which is adjacent to a bottom portion of the side surface of the protrusion portion.

16 . The electronic apparatus of claim 11 , wherein in the second electrode, an oxygen concentration of a portion covering the protrusion portion is greater than an oxygen concentration of a portion covering the emission layer.

17 . The electronic apparatus of claim 11 , wherein the display apparatus further comprises a sub protrusion portion disposed on the bank layer,
wherein the sub protrusion portion has a smaller thickness than the protrusion portion.

18 . The electronic apparatus of claim 17 , wherein at least a portion of the sub protrusion portion is located between the protrusion portion and an opening of the bank layer.

19 . The electronic apparatus of claim 17 , wherein in a plan view, the protrusion portion and the sub protrusion portion have a closed shape, and the sub protrusion portion surrounds the protrusion portion.

20 . The electronic apparatus of claim 19 , wherein the sub protrusion portion has a circular closed shape in the plan view.

Assignees

• Samsung Display Co Ltd

Inventors

• Kwon Ohjune
• Lee Jeongseok

Classifications

• H10K59/1201

  Manufacture or treatment · CPC title

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K59/122 Primary

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

• H10K2102/351

  Thickness · CPC title