Light emitting display apparatus

Patent metadata

Field	Value
Publication number	US-11527590-B2
Application number	US-202016869132-A
Country	US
Kind code	B2
Filing date	May 7, 2020
Priority date	May 20, 2019
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

A light emitting display apparatus according to an exemplary embodiment of the present disclosure includes an insulating layer on a substrate and including a base portion and a protrusion portion having an uneven portion at a part of the base portion, a first electrode covering an upper portion of the base portion and a side portion and a upper portion of the protrusion portion and disposed along the shape of the uneven portion, a bank layer covering a part of the insulating layer and a part of the first electrode, and an emission layer on the first electrode and the bank layer, and a second electrode on the emission layer.

First claim

What is claimed is:

1. A light emitting display apparatus, comprising:
an insulating layer on a substrate and including a base portion and a protrusion portion disposed on the base portion, the protrusion portion exposing a part of the base portion;
an uneven portion disposed on an upper surface of the protrusion portion;
a first electrode configured to cover an upper portion of the base portion which is exposed by the protrusion portion, and a side portion and an upper portion of the protrusion portion, and disposed along a shape of the uneven portion of the insulating layer;
a bank layer configured to cover a part of the insulating layer and a part of the first electrode, and overlap with the uneven portion;
an emission layer on the first electrode and the bank layer; and
a second electrode on the emission layer,
wherein the uneven portion disposed on the upper surface of the protrusion portion is parallel with the base portion or the substrate.

2. The light emitting display apparatus of claim 1 , wherein:
the bank layer includes an organic material; and
an upper surface of the bank layer is evener than the upper surface of the protrusion portion.

3. The light emitting display apparatus of claim 1 , wherein the uneven portion of the insulating layer has at least one of a concave semicircular shape, a triangular shape, an oval shape, and a trapezoidal shape.

4. The light emitting display apparatus of claim 1 , wherein the uneven portion of the insulating layer has a depth in a range of approximately 1.5 μm to approximately 2 μm.

5. The light emitting display apparatus of claim 1 , wherein:
the bank layer includes an inorganic material; and
the bank layer is disposed along a shape of the first electrode.

6. The light emitting display apparatus of claim 5 , wherein the uneven portion has at least one of a concave semicircular shape, a triangular shape, an oval shape, and a trapezoidal shape.

7. The light emitting display apparatus of claim 5 , wherein the uneven portion has a depth in a range of approximately 1.5 μm to approximately 2 μm.

8. The light emitting display apparatus of claim 1 , wherein:
the uneven portion is disposed on the side portion and the upper surface of the protrusion portion;
the bank layer includes an inorganic material; and
the bank layer is disposed along the shape of the uneven portion.

9. The light emitting display apparatus of claim 8 , wherein the uneven portion has a wrinkle shape.

10. The light emitting display apparatus of claim 1 , further comprising:
a first encapsulation layer on the second electrode along a shape of the second electrode; and
a second encapsulation layer on the first encapsulation layer,
wherein a refractive index of the second encapsulation layer is lower than a refractive index of the first encapsulation layer.

11. The light emitting display apparatus of claim 10 , wherein a refractive index of the bank layer is equal to or lower than a refractive index of the emission layer.

12. The light emitting display apparatus of claim 1 , wherein the first electrode includes a reflective layer and a transparent conductive layer on the reflective layer.

13. A light emitting display apparatus, comprising:
an overcoating layer on a substrate and including a base portion and a protrusion portion disposed on the base portion, the protrusion portion exposing a part of the base portion;
a light emitting element on the overcoating layer and including a first electrode, an emission layer, and a second electrode;
a bank layer between the first electrode and the emission layer, and configured to define an emission area;
an encapsulation part on the light emitting element; and
a light extraction pattern on an upper surface of the protrusion portion of the overcoating layer, and overlapping with the bank layer, and configured to change a traveling direction of light emitted from the emission layer and improve a light extraction efficiency and a front surface efficiency,
wherein the light extraction pattern disposed on the upper surface of the protrusion portion is parallel with the base portion or the substrate.

14. The light emitting display apparatus of claim 13 , wherein the light extraction pattern includes a concave line pattern or a dot pattern on the upper surface of the protrusion portion of the overcoating layer.

15. The light emitting display apparatus of claim 14 , wherein the light extraction pattern is disposed to surround the emission area.

16. The light emitting display apparatus of claim 13 , wherein the light extraction pattern is disposed to have a wrinkle structure on a side surface and the upper surface of the protrusion portion of the overcoating layer.

17. The light emitting display apparatus of claim 16 , wherein the wrinkle structure of the light extraction pattern has an irregular wrinkle shape.

18. The light emitting display apparatus of claim 13 , wherein:
the encapsulation part includes a first encapsulation layer, an organic encapsulation layer, and a second encapsulation layer;
the first encapsulation layer is on the second electrode along a shape of the second electrode;
the organic encapsulation layer is on the first encapsulation layer;
a refractive index of the organic encapsulation layer is lower than a refractive index of the first encapsulation layer; and
a refractive index of the bank layer is equal to or lower than a refractive index of the emission layer.

19. A light emitting display apparatus, comprising:
an overcoating layer on a substrate and including a base portion and a protrusion portion disposed on the base portion, the protrusion portion exposing a part of the base portion;
an uneven portion disposed on an upper surface of the protrusion portion;
a first electrode including a reflective layer on the overcoating layer and a transparent conductive layer on the reflective layer;
a bank layer configured to cover a part of the overcoating layer and a part of the first electrode, and to overlap with the uneven portion;
an emission layer on the first electrode and the bank layer; and
a second electrode on the emission layer,
wherein a distance between the reflective layer of the first electrode and the second electrode is configured to adjust to implement a constructive interference for light emitted from the emission layer, and
wherein the uneven portion disposed on the upper surface of the protrusion portion which is parallel with the base portion or the substrate.

20. The light emitting display apparatus of claim 19 , wherein the uneven portion has at least one of a concave semicircular shape, a triangular shape, an oval shape, and a trapezoidal shape.

21. The light emitting display apparatus of claim 19 , wherein the uneven portion has a depth in a range of approximately 1.5 μm to approximately 2 μm.

Assignees

• Lg Display Co Ltd

Inventors

• Sim Dongmin
• Koo Wonhoe
• Choi Hyekyung
• Kim Yongcheol
• Han Kyunghoon
• Cho Youngdock

Classifications

• H01L51/5218

  Electricity · mapped topic

• H01L27/3246 Primary

  Electricity · mapped topic

• H01L51/5253

  Electricity · mapped topic

• H01L2251/305

  Electricity · mapped topic

• H10K59/879

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