Organic light emitting diode device

Patent metadata

Field	Value
Publication number	US-11296156-B2
Application number	US-201916578695-A
Country	US
Kind code	B2
Filing date	Sep 23, 2019
Priority date	Nov 28, 2018
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

An inorganic light emitting diode device includes: a substrate including a plurality of sub-pixels; a thin film transistor (TFT) in each of the plurality of sub-pixels, wherein the TFT has at least one inorganic layer; an encapsulation layer on an organic light emitting layer, wherein the encapsulation layer includes at least one organic encapsulation layer and at least one inorganic encapsulation layer; and an opening exposing the inorganic layer of the TFT, wherein the opening connects the at least one inorganic encapsulation layer with the inorganic layer of the TFT.

First claim

What is claimed is:

1. A flexible organic light emitting diode (OLED) device, comprising:
a substrate including a plurality of sub-pixels, each of the plurality of sub-pixels including a driving TFT;
an inter-layered insulating layer covering the driving TFT;
an overcoat layer on the inter-layered insulating layer;
a light emitting diode on the overcoat layer and in each of the plurality of sub-pixels, the light emitting diode including a first electrode on the overcoat layer, an organic light emitting layer on the first electrode, and a second electrode on the organic light emitting layer;
a bank covering an edge portion of the first electrode; and
a protection film on the second electrode and including a first protective film and a third protective film that are each formed of an inorganic insulating material, and a second protective film formed of an organic insulating material,
wherein the first hole is in the second protective film, and
wherein the first hole corresponds to a space between adjacent first electrodes or overlaps the first electrode.

2. The flexible OLED device of claim 1 , wherein:
the protection film further includes a fourth protective film formed of an organic insulating material, and
wherein the first hole is in the second and fourth protective films.

3. The flexible OLED device of claim 1 , wherein:
the protection film further includes a fourth protective film formed of an organic insulating material,
wherein the first hole is in the second protective film, and
a location of a second hole is based on the location of the first hole and is in the fourth protective film.

4. The flexible OLED device of claim 1 , wherein the first hole is on the bank and passes through the organic light emitting layer, the second electrode, and the protection film.

5. The flexible OLED device of claim 4 , wherein the protection film is formed using an atomic layer deposition method.

6. The flexible OLED device of claim 4 , wherein the first hole is located at at least two sides of each of the plurality of sub-pixels, or at one of the at least two sides of each of the plurality of sub-pixels.

7. The flexible OLED device of claim 1 , wherein the first hole is further in the first electrode located below the bank, and a location of a second hole is based on the location of the first hole and is in the overcoat layer.

8. The flexible OLED device of claim 7 , wherein the protection film is formed using an atomic layer deposition method.

9. The flexible OLED device of claim 7 , wherein the second hole has a width greater than that of the first hole such that the first electrode and the overcoat layer form an undercut.

10. The flexible OLED device of claim 9 , wherein the protection film located at a region of the undercut has a tip shape.

11. The flexible OLED device of claim 7 , wherein the second hole exposes the inter-layered insulating layer.

12. The flexible OLED device of claim 1 , further comprising a spacer on the bank, wherein the spacer has an inverted taper shape.

13. The flexible OLED device of claim 1 , wherein the first protective film and the third protective film contact each other in the first hole.

14. A flexible organic light emitting diode (OLED) device, comprising:
a substrate including a plurality of sub-pixels, each of the plurality of sub-pixels including a driving TFT;
an inter-layered insulating layer covering the driving TFT;
an overcoat layer on the inter-layered insulating layer;
a first electrode on the overcoat layer and in each of the plurality of sub-pixels;
a bank covering an edge portion of the first electrode;
an organic light emitting layer on the first electrode;
a second electrode on the organic light emitting layer; and
a protection film on the second electrode, wherein the protection film includes at least one inorganic layer,
wherein a location of a first hole is based on a location of the bank, and exposes at least one of the overcoat layer, the bank, and the protection film, and a location of a second hole is based on the location of the first hole,
wherein the second hole has a width greater than that of the first hole such that the first electrode and the overcoat layer form an undercut, and
wherein the first electrode is connected to the inorganic layer of the protection film at the undercut, and is configured to reduce moisture permeation to the organic light emitting layer.

15. The flexible OLED device of claim 14 , wherein the undercut has a tip shape.

16. The flexible OLED device of claim 14 , wherein the first electrode includes a metal material.

17. The flexible OLED device of claim 14 , wherein the first hole and the second hole define at least one area in a bending region for reducing stress caused by bending the flexible OLED device.

18. The OLED device of claim 14 , further comprising an organic encapsulation layer between a first inorganic encapsulation layer and a second inorganic encapsulation layer of the at least one inorganic encapsulation layer.

19. The OLED device of claim 18 , wherein the organic encapsulation layer is encapsulated by the first and second inorganic encapsulation layers.

20. The OLED device of claim 18 , wherein the first inorganic encapsulation layer includes a step.

21. The OLED device of claim 18 , wherein the second inorganic encapsulation layer includes a step.

22. The OLED device of claim 18 , wherein the second inorganic encapsulation layer encapsulates a plurality of surfaces of the organic light emitting layer and the second electrode.

23. The OLED device of claim 18 , further comprising a third inorganic encapsulation layer of the at least one inorganic encapsulation layer encapsulating a plurality of surfaces of the organic light emitting layer and the second electrode.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Mi-Seong
• Yoo Se-Jong
• Lee Kyoung-Mook

Classifications

• H10K50/805

  Electrodes · CPC title

• H10D86/451

  characterised by the compositions or shapes of the interlayer dielectrics · CPC title

• H10K59/8731

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

• H10K59/8723

  Vertical spacers, e.g. arranged between the sealing arrangement and the OLED · CPC title

• H10K59/805

  Electrodes · CPC title