Display device

Patent metadata

Field	Value
Publication number	US-11367753-B2
Application number	US-201916386139-A
Country	US
Kind code	B2
Filing date	Apr 16, 2019
Priority date	May 16, 2018
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

A display device includes a first electrode disposed on a substrate; a pixel defining layer including first through third exposure areas, each exposing at least part of the first electrode; first through third organic light emitting layers disposed in the first through third exposure areas, respectively; a second electrode disposed on the first through third organic light emitting layers; a first capping layer disposed on the second electrode and overlapping upper surfaces of the first through third organic light emitting layers; a second capping member disposed on the first capping layer, does not overlap the upper surface of the first organic light emitting layer, and overlaps only a portion of each of the upper surfaces of the second and third organic light emitting layers; and an encapsulation layer covering the second capping member.

First claim

What is claimed is:

1. A display device comprising:
a first electrode disposed on a surface of a substrate, the first electrode including a first pixel electrode, a second pixel electrode, and a third pixel electrode;
a pixel defining layer disposed on the first electrode, the pixel defining layer including a first exposure area exposing the first pixel electrode, a second exposure area exposing the second pixel electrode, and a third exposure area exposing the third pixel electrode;
a first organic light emitting layer, a second organic light emitting layer, and a third organic light emitting layer disposed in the first, second, and third exposure areas, respectively, each of the first, second, and third light emitting layers including an upper surface;
a second electrode disposed on the first organic light emitting layer, the second organic light emitting layer, and the third organic light emitting layer;
a first capping layer disposed on the second electrode and overlapping the upper surfaces of the second, and third organic light emitting layers;
a second capping layer disposed on the first capping layer, the second capping layer overlapping the second organic light emitting layer and the third organic light emitting layer; and
an encapsulation layer covering the second capping layer,
wherein the second organic light emitting layer includes a portion which does not overlap any one of the second capping layer and the pixel defining layer in a direction perpendicular to the surface of the substrate, and,
wherein the third organic light emitting layer includes a portion which does not overlap any one of the second capping layer and the pixel defining layer in the direction perpendicular to the surface of the substrate.

2. The display device of claim 1 , wherein the first organic light emitting layer comprises a first lower charge transport layer on the first pixel electrode and a first organic element layer on the first lower charge transport layer, and the second organic light emitting layer comprises a second lower charge transport layer on the second pixel electrode and a second organic element layer on the second lower charge transport layer, and wherein a thickness of the first lower charge transport layer and a thickness of the second lower charge transport layer are different from each other.

3. The display device of claim 2 , wherein the thickness of the first lower charge transport layer is greater than the thickness of the second lower charge transport layer.

4. The display device of claim 2 , wherein the third organic light emitting layer comprises a third lower charge transport layer on the third pixel electrode and a third organic element layer on the third lower charge transport layer, and wherein the thickness of the second lower charge transport layer is greater than a thickness of the third lower charge transport layer.

5. The display device of claim 2 , wherein a thickness of the first organic element layer and a thickness of the second organic element layer are different from each other.

6. The display device of claim 2 , wherein the thickness of the first organic element layer is greater than the thickness of the second organic element layer.

7. The display device of claim 2 , wherein the third organic light emitting layer comprises a third lower charge transport layer on the third pixel electrode and a third organic element layer on the third lower charge transport layer, and wherein the thickness of the second organic element layer is greater than a thickness of the third organic element layer.

8. The display device of claim 1 , wherein the second capping layer has opposed ends, with one end of the second capping layer overlapping the upper surface of the second organic light emitting layer, and the other end of the second capping layer overlapping the upper surface of the third organic light emitting layer.

9. The display device of claim 1 , wherein the second capping layer comprises a third capping layer and a fourth capping layer separated from each other, wherein the third capping layer is disposed on the second organic light emitting layer, and the fourth capping layer is disposed on the third organic light emitting layer.

10. The display device of claim 1 wherein the first and second capping layers are integrated into one layer.

11. The display device of claim 1 , wherein a cross-sectional area of the first exposure area is larger than a cross-sectional area of the third exposure area.

12. The display device of claim 11 , wherein the cross-sectional area of the first exposure area is larger than a cross-sectional area of the second exposure area, and the cross-sectional area of the second exposure area is larger than the cross-sectional area of the third exposure area.

13. The display device of claim 1 , wherein the first, second, and third exposure areas are disposed in a matrix structure in which the first and second exposure areas are repeatedly disposed in any one column, and the third exposure areas are repeatedly disposed to be adjacent to the column in which the first and second exposure areas are repeatedly disposed.

14. The display device of claim 1 , wherein the first capping layer and the second capping layer have different optical refractive indices, and a difference between the optical refractive indices of the first capping layer and the second capping layer is about 0.9 or less.

15. The display device of claim 1 , wherein the first capping layer has a first thickness, and the second capping layer has a second thickness, wherein the first thickness is about 1000 Å or less, and the second thickness is about 400 Å to about 600 Å.

16. A display device comprising:
a first electrode including a first pixel electrode and a second pixel electrode;
a pixel defining layer on the first electrode, the pixel defining layer including a first exposure area exposing the first pixel electrode and a second exposure area exposing the second pixel electrode;
a first lower charge transport layer disposed on the first pixel electrode, disposed in the first exposure area and having a first thickness;
a second lower charge transport layer disposed on a surface of the second pixel electrode, disposed in the second exposure area and having a second thickness different from the first thickness;
a first organic element layer disposed on the first lower charge transport layer and having a third thickness and an upper surface;
a second organic element layer disposed on the second lower charge transport layer and having a fourth thickness different from the third thickness and an upper surface;
a second electrode disposed on the first and second organic element layers;
a first capping layer disposed on the second electrode and overlapping the upper surfaces of the first and second organic element layers; and
a second capping layer disposed on the first capping layer that does not overlap the upper surface of the first organic element layer, and overlaps the second organic element layer,
wherein the second organic element layer includes a portion which does not overlap any one of the second capping layer and the pixel defining layer in a direction perpendicular to the surface of the second pixel electrode.

17. The display device of claim 16 , wherein the first thickness is greater than the second thickness, and the third thickness is greater than the fourth thickness.

18. The display device of claim 16 , further comprising:
a third lower charge transport layer disposed on a third pixel electrode, disposed in a third exposure area ex

Assignees

• Samsung Display Co Ltd

Inventors

• Oh Eon Seok
• Jeon Woo Sik
• Kim Sang Yeol
• Jo Han Ggoch Nu Ri

Classifications

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K59/877

  comprising scattering means · CPC title

• H10K59/8731

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

• H01L51/5253

  Electricity · mapped topic

• H01L27/3246

  Electricity · mapped topic