Light emitting display device

Patent metadata

Field	Value
Publication number	US-10418520-B2
Application number	US-201816023930-A
Country	US
Kind code	B2
Filing date	Jun 29, 2018
Priority date	Jun 30, 2017
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

A light emitting display device includes: a light emitting element that includes a light emitting layer between a first electrode and a second electrode; a wavelength conversion layer overlapping the light emitting element; and an uneven layer that includes a plurality of furrows between the light emitting element and the wavelength conversion layer, wherein a shortest distance between a bottom surface of the plurality of furrows and the wavelength conversion layer is 0.1 um or greater.

First claim

What is claimed is:

1. A light emitting display device comprising:
a light emitting element including a light emitting layer disposed between a first electrode and a second electrode;
a wavelength conversion layer overlapping the light emitting element; and
an uneven layer including a plurality of furrows disposed between the light emitting element and the wavelength conversion layer,
wherein a bottom surface of the plurality of furrows is separate at a distance from the wavelength conversion layer.

2. The light emitting display device of claim 1 , wherein a shortest distance between the bottom surface of the plurality of furrows and the wavelength conversion layer is in a range of 0.1 um to 3 um.

3. The light emitting display device of claim 1 , further comprising:
a circuit region including a thin film transistor connected to the first electrode;
a first insulating layer that covers the circuit region and supports the wavelength conversion layer; and
a second insulating layer that covers the first insulating layer and the wavelength conversion layer,
wherein the uneven layer is formed at the second insulating layer overlapping the wavelength conversion layer.

4. The light emitting display device of claim 3 , wherein the second insulating layer between the bottom surface of the plurality of furrows and the wavelength conversion layer has a thickness in a range of 0.1 um to 3 um.

5. A light emitting display device comprising:
a light emitting element including a light emitting layer;
a wavelength conversion layer vertically overlapping the light emitting element; a barrier layer covering the wavelength conversion layer;
a second insulating layer covering the barrier layer,
an uneven layer including a plurality of furrows disposed between the light emitting element and the wavelength conversion layer, wherein the uneven layer is formed at the second insulating layer overlapping the wavelength conversion layer,
wherein the barrier layer has a thickness corresponding to a separate distance between the bottom surface of the plurality of furrows and the wavelength conversion layer.

6. The light emitting display device of claim 5 , wherein the barrier layer has a thickness in a range of 0.1 um to 3 um.

7. The light emitting display device of claim 5 , further comprising
a circuit region including a thin film transistor electrically connected to the first electrode; and
a first insulating layer that covers the circuit region and supports the wavelength conversion layer,
wherein the barrier layer covers the first insulating layer on the circuit region.

8. The light emitting display device of claim 7 , wherein the barrier layer is formed of a same material as the first insulating layer.

9. The light emitting display device of claim 1 , wherein the uneven layer includes a wall defining each of the plurality of furrows, and
wherein the wall includes:
a base surface portion close to the wavelength conversion layer;
a top portion separate at a predetermined height from the base surface portion; and
a side surface portion between the base surface portion and the top portion.

10. The light emitting display device of claim 9 , wherein a cross-sectional area of the wall parallel to the wavelength conversion layer increases as the cross-sectional area is close to the wavelength conversion layer.

11. The light emitting display device of claim 9 , wherein the side surface portion has a curved shape with an inflection point.

12. The light emitting display device of claim 11 , wherein each of the first electrode, the light emitting layer and the second electrode has a shape matching a contour of the uneven layer.

13. The light emitting display device of claim 12 , wherein the side surface portion includes:
an inflection portion including the inflection point;
a first curved portion between the inflection portion and the base surface portion; and
a second curved portion between the inflection portion and the top portion,
wherein a thickness of the light emitting element covering the inflection portion is less than that of the light emitting element covering each of the first and second curved portions.

14. The light emitting display device of claim 13 , wherein the wall has a height including a height ratio of the first curved portion, the inflection portion and the second curved portion to be 1:3:1.

15. The light emitting display device of claim 13 , wherein the wall has an aspect ratio in a range of 0.4 to 0.7.

16. The light emitting display device of claim 13 , wherein base surface portions of neighboring walls are separate from each other.

17. The light emitting display device of claim 16 , wherein the base surface portions of the neighboring walls are separate at 0.3 um to 10 um, and
wherein an aspect ratio of the wall is in a range of 0.5 to 1.0.

18. The light emitting display device of claim 17 , wherein the wall has an aspect ratio at half maximum in a range of 0.4 to 0.8.

19. The light emitting display device of claim 18 , wherein the aspect ratio at half maximum of the wall over the aspect ratio is in a range of 0.7 to 1.0.

20. The light emitting display device of claim 18 , wherein a slope of an angle between a tangent line to the base surface portion and a horizontal plane is in a range of 40 to 80 degrees.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Soo-Kang
• Koo Won-Hoe
• Jang Ji-Hyang
• Jo So-Young

Classifications

• H01L33/20 Primary

  Electricity · mapped topic

• H01L51/00

  Electricity · mapped topic

• H01L33/505

  Electricity · mapped topic

• H01L33/58

  Electricity · mapped topic

• H01L27/1248

  Electricity · mapped topic