Organic light emitting display panel and organic light emitting display device including the same

Patent metadata

Field	Value
Publication number	US-10763317-B2
Application number	US-201916706534-A
Country	US
Kind code	B2
Filing date	Dec 6, 2019
Priority date	Dec 17, 2018
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

A display panel and an organic light emitting display device with enhanced light extraction efficiency is described. The display panel and the display device include an insulating film including at least one concave portion, a first electrode disposed to cover the concave portion, a bank including a first part on the first electrode and overlapping a part of the flat portion of the concave portion, a second part extending from the first part and overlapping an inclined portion of the concave portion, and a third part extending from the second part and disposed on the side portion, an organic layer overlapping the concave portion, and a second electrode on the organic layer and the bank. A width of the first part of the bank is wider than a width of the second part of the bank. Thus, it is possible to provide a display device with enhanced light extraction efficiency.

First claim

What is claimed is:

1. An organic light emitting display panel comprising:
a substrate including an active area that displays an image and a non-active area that does not display the image;
an insulating film disposed on the substrate, the insulating film including at least one concave portion in the active area, the concave portion having a flat portion, an inclined portion that extends from the flat portion and surrounds the flat portion, and a side portion that extends from the inclined portion and is farther from the substrate than the flat portion;
a first electrode disposed on the side portion, the inclined portion, and the flat portion of the concave portion of the insulating film;
a bank including a first part, a second part, and a third part, wherein the first part is disposed on the first electrode and overlaps a portion of the flat portion of the concave portion, the second part extends from the first part and overlaps the inclined portion of the concave portion, and the third part extends from the second part and overlaps the side portion, wherein a width of the first part of the bank is wider than a width of the second part of the bank;
an organic light emitting layer on the first electrode and the bank, the organic light emitting layer overlapping the concave portion of the insulating film; and
a second electrode disposed on the organic layer and the bank, the second electrode overlapping the concave portion of the insulating film.

2. The organic light emitting display panel according to claim 1 , wherein the first electrode includes a first area, a second area, and a third, area, wherein the first area overlaps the flat portion of the concave portion, the second area extends from the first area and overlaps the inclined portion of the concave portion, and the third area extends from the second area and overlaps the side portion.

3. The organic light emitting display panel according to claim 2 , wherein the bank does not cover a part of the first area of the first electrode.

4. The organic light emitting display panel according to claim 1 , wherein an angle of the inclined portion of the concave portion with respect to a surface of the substrate is greater than or equal to 27° and less than 80°.

5. The organic light emitting display panel according to claim 1 , wherein a height of the inclined portion of the concave portion is larger than or equal to 0.7 μm.

6. The organic light emitting display panel according to claim 3 , wherein the part of the first area of the first electrode that is not covered by the bank is a first light emitting area that is disposed in the flat portion of the concave portion.

7. The organic light emitting display panel according to claim 6 , wherein the second area of the first electrode that overlaps the inclined portion of the concave portion is a second light emitting area that surrounds the first light emitting area.

8. The organic light emitting display panel according to claim 7 , wherein the first light emitting area and the second light emitting area emit a same color of light.

9. The organic light emitting display panel according to claim 7 , wherein a portion of the first area of the first electrode that is overlapped by the bank is a first non-light emitting area that is disposed between the first light emitting area and the second light emitting area.

10. The organic light emitting display panel according to claim 9 , wherein the third area of the first electrode is a second non-light emitting area that surrounds the second light emitting area.

11. The organic light emitting display panel according to claim 2 , wherein the first electrode is reflective.

12. The organic light emitting display panel according to claim 11 , wherein a distance between the second area of the first electrode and the bank is less than or equal to 0.5 μm to 0.8 μm.

13. The organic light emitting display panel according to claim 1 , wherein a ratio of the width of the second part of the bank to the width of the first part of the bank is in a range from 1:1.5 to 1:4.

14. The organic light emitting display panel according to claim 1 , wherein the bank comprises a transparent inorganic insulating material or a transparent organic insulating material.

15. The organic light emitting display panel according to claim 1 , wherein the organic light emitting layer is disposed over all or a portion of the insulating film.

16. The organic light emitting display device of claim 1 , wherein the concavity of the insulating film comprises a flat portion, an inclined portion that extends from the flat portion and surrounds the flat portion, and a side portion that extends from the inclined portion and is farther from the substrate than the flat portion.

17. The organic light emitting display pane of claim 16 , wherein the sub-pixel comprises:
a first electrode disposed on the side portion, the inclined portion, and the flat portion of the concavity;
a bank including a first part, a second part, and a third part, wherein the first part is disposed on the first electrode and overlaps a portion of the flat portion of the concavity, the second part extends from the first part and overlap the inclined portion of the concavity, and the third part extending from the second part and overlapping the side portion, wherein a width of the first part of the bank is wider than a width of the second part of the bank;
an organic light emitting layer on the first electrode and the bank, the organic light emitting layer overlapping the concavity; and
a second electrode disposed on the organic layer and the bank, the second electrode overlapping the concavity.

18. The organic light emitting display panel according to claim 17 , wherein a thickness of the organic light emitting layer on the side portion of the concave portion is different from a thickness of the organic light emitting layer on the inclined portion of the concave portion.

19. An organic light emitting display device comprising:
an active area including a plurality of subpixels that display an image and a non-active area surrounding the active area, the non-active area does not display the image, wherein at least one subpixel of the plurality of subpixels comprises:
an insulating film disposed over a substrate, the insulating film including a concave portion having a flat portion, an inclined portion that extends from the flat portion and surrounds the flat portion, and a side portion that extends from the inclined portion and is farther from the substrate than the flat portion;
a first electrode including a first area, a second area, and a third area, wherein the first area overlaps the flat portion of the concave portion, the second area extends from the first area and overlaps the inclined portion of the concave portion, and the third area extends from the second area and overlaps the side portion;
a bank including a first part, a second part, and a third part, wherein the first part is disposed on the first electrode and overlaps a portion of the flat portion of the concave portion, the second part extends from the first part and overlaps the inclined portion of the concave portion, and the third part extends from the second part the side portion;
an organic light emitting layer on the first electrode and the bank, the organic light emitting layer overlapping the concave portion of the insulating film; and
a second electrode disposed on the organic layer and the bank, the second electrode overlapping the concave portion of the insulating film;
wherein an area in which the

Assignees

• Lg Display Co Ltd

Inventors

• Lee Sunmi
• Beak Jungsun
• Lee Seongjoo

Classifications

• H10K59/878

  comprising reflective means · CPC title

• H10K59/80522

  combined with auxiliary electrodes · CPC title

• H10K59/80518

  Reflective anodes, e.g. ITO combined with thick metallic layers · CPC title

• H10K59/80515

  characterised by their shape · CPC title

• H10K59/122 Primary

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