Organic Light Emitting Display Panel and Organic Light Emitting Display Device Including the Same

Patent metadata

Field	Value
Publication number	US-2024431153-A1
Application number	US-202418829039-A
Country	US
Kind code	A1
Filing date	Sep 9, 2024
Priority date	Dec 17, 2018
Publication date	Dec 26, 2024
Grant date	—

Abstract

An organic light emitting display device is disclosed. The display device includes an insulating film including a concave portion in an area of at least one subpixel, a first electrode on a side portion of the concave portion and on the concave portion in an area of the subpixel, an organic layer overlapping the concave portion and on the first electrode. An organic layer disposed in the at least one blue subpixel may include at least one of a first light emitting dopant with a maximum emission wavelength of 457 nm or less, a second light emitting dopant with a full width at half maximum (FWHM) of 30 nm or less, and/or a third light emitting dopant with the maximum emission wavelength of 457 nm or less and the full width at half maximum of 30 nm or less. Thus, a display device with enhanced light extraction efficiency is provided.

First claim

What is claimed is:

1 . An organic light emitting display panel including a plurality of sub-pixels, comprising:
a substrate; a transistor on the substrate, electrically connected to the plurality of sub-pixels; and an insulating film over the transistor, the insulating film including at least one concavity, wherein, in a plan view, a first sub-pixel of the plurality of sub-pixels includes a plurality of light emitting areas and a non-light emitting area between the plurality of light emitting areas, wherein the first sub-pixel comprises a first electrode, an organic layer, and a second electrode, and wherein the organic layer including a light emitting dopant with a full width at half maximum (FWHM) of 64 nm or less.

2 . The organic light emitting display panel according to claim 1 , wherein the light emitting dopant further includes at least one of a first light emitting dopant with a maximum emission wavelength of 457 nm or less, a second light emitting dopant with a full width at half maximum (FWHM) of 30 nm or less, or a third light emitting dopant with the maximum emission wavelength of 457 nm or less and the full width at half maximum of 30 nm or less.

3 . The organic light emitting display panel according to claim 1 , wherein the light emitting dopant further includes at least one of a first light emitting dopant with a maximum emission wavelength of 522 nm or less, a second light emitting dopant with a full width at half maximum (FWHM) of 64 nm or less, or a third light emitting dopant with the maximum emission wavelength of 522 nm or less and the full width at half maximum of 64 nm or less.

4 . The organic light emitting display panel according to claim 2 , wherein the organic layer is configured to emit blue light.

5 . The organic light emitting display panel according to claim 3 , wherein the organic layer is configured to emit green light.

6 . The organic light emitting display panel according to claim 1 , further comprising:
a bank, wherein the plurality of light emitting areas includes a first light emitting area and a second light emitting area, wherein the first light emitting area is an area in which the bank and the first electrode are non-overlapping in the at least one concavity, and wherein the second light emitting area is an area of the first electrode that overlaps an inclined portion of the at least one concavity.

7 . The organic light emitting display panel according to claim 6 , wherein the non-light emitting area includes a first non-light emitting area between the first light emitting area and the second light emitting area, and a second non-light emitting area that surrounds the second light emitting area.

8 . The organic light emitting display panel according to claim 7 , wherein the first non-light emitting area is a portion of the first electrode on a flat portion of the at least one concavity that is overlapped by the bank.

9 . The organic light emitting display panel according to claim 7 , wherein the second non-light emitting area is an area of the first electrode that is non-overlapping with the at least one concavity.

10 . The organic light emitting display panel according to claim 2 , wherein at least one of the first light emitting dopant, the second light emitting dopant, or the third light emitting dopant is included in a partial area of the organic layer.

11 . The organic light emitting display panel according to claim 3 , wherein at least one of the first light emitting dopant, the second light emitting dopant, or the third light emitting dopant is included in a partial area of the organic layer.

12 . The organic light emitting display panel according to claim 1 , further comprising:
a capping layer on the second electrode.

13 . The organic light emitting display panel according to claim 12 , wherein the capping layer includes a first capping layer on the second electrode and a second capping layer on the first capping layer, wherein the first capping layer comprises an organic material and the second capping layer comprises an inorganic material.

14 . The organic light emitting display panel according to claim 1 , wherein a portion of the second electrode that overlaps an inclined portion of the at least one concavity is thicker than a portion of the second electrode that overlaps a flat portion of the at least one concavity.

15 . The organic light emitting display panel according to claim 1 , further comprising:
a bank on the first electrode, the bank including a first part and a second part, wherein the first part of the bank overlaps an inclined portion of the at least one concavity and the second part of the bank overlaps a side portion of the at least one concavity.

16 . The organic light emitting display panel according to claim 15 , wherein the first part of the bank is configured to absorb at least a portion of light having a first wavelength that is emitted from the organic layer to the first part of the bank, and wherein the light emitting dopant included in the organic layer reduces shifting of a color coordinate of light emitted from the organic layer to the first part of the bank from the first wavelength to a second wavelength that is greater than the first wavelength.

17 . The organic light emitting display panel according to claim 7 , wherein the first light emitting area and the second light emitting area are concentric with the first non-light emitting area disposed between the first light emitting area and the second light emitting area.

18 . The organic light emitting display panel according to claim 17 , wherein shapes of the first light emitting area, the second light emitting area and the first non-light emitting area are circular, elliptical, or polygonal, wherein the polygonal comprises octagonal, triangular, square, hexagonal, or combinations thereof, in a plan view.

19 . The organic light emitting display panel according to claim 18 , wherein a plurality of subpixels respectively comprise a pair of the first light emitting area and the second light emitting area.

20 . The organic light emitting display panel according to claim 19 , wherein the pair of the first light emitting area and the second light emitting area are spaced apart from another pair of the first light emitting area and the second light emitting area.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Mi-Na
• Yoo Namseok
• Beak Jungsun
• Lee Seongjoo
• Lee Sunmi

Classifications

• H10K59/879

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

• H10K59/878

  comprising reflective means · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K59/80518

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

• H10K59/122 Primary

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