Electroluminescent display apparatus

Patent metadata

Field	Value
Publication number	US-11211438-B2
Application number	US-201916696531-A
Country	US
Kind code	B2
Filing date	Nov 26, 2019
Priority date	Dec 4, 2018
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

An electroluminescent display apparatus comprises a first subpixel, a second subpixel, and a third subpixel defined on a substrate; a first electrode disposed in each of the first subpixel, the second subpixel, and the third subpixel in the substrate; a bank provided between two adjacent subpixels among the first subpixel, the second subpixel, and the third subpixel to cover an edge of the first electrode; a first light emitting layer disposed on the first electrode of the first subpixel; a second light emitting layer disposed on the first electrode of the second subpixel; a third light emitting layer disposed on the first electrode of the third subpixel; and a second electrode disposed on the first to third light emitting layers, wherein the third light emitting layer is extended onto the bank between the first subpixel and the second subpixel.

First claim

What is claimed is:

1. An electroluminescent display apparatus comprising:
a first subpixel, a second subpixel, and a third subpixel defined on a substrate;
a first electrode disposed in each of the first subpixel, the second subpixel, and the third subpixel in the substrate;
a bank provided between two adjacent subpixels among the first subpixel, the second subpixel, and the third subpixel to cover an edge of the first electrode and define an emission area;
a first light emitting layer disposed on the first electrode of the first subpixel;
a second light emitting layer disposed on the first electrode of the second subpixel;
a third light emitting layer disposed on the first electrode of the third subpixel; and
a second electrode disposed on the first to third light emitting layers,
wherein the third light emitting layer is extended onto the bank between the first subpixel and the second subpixel, and
wherein the extended third light emitting layer does not overlap with the first light emitting layer in the emission area.

2. The electroluminescent display apparatus of claim 1 , wherein the extended third light emitting layer is disposed on an upper surface of each of the first light emitting layer and the second light emitting layer on the bank.

3. The electroluminescent display apparatus of claim 1 , wherein the first light emitting layer is further disposed on the bank between the second subpixel and the third subpixel and overlaps the second light emitting layer and the third light emitting layer.

4. The electroluminescent display apparatus of claim 3 , wherein the first light emitting layer disposed on the bank between the second subpixel and the third subpixel is located under a lower surface of each of the second light emitting layer and the third light emitting layer.

5. The electroluminescent display apparatus of claim 1 , wherein the second light emitting layer is further disposed on the bank between the third subpixel and the first subpixel and overlaps the third light emitting layer and the first light emitting layer.

6. The electroluminescent display apparatus of claim 5 , wherein the second light emitting layer disposed on the bank between the third subpixel and the first subpixel is located on an upper surface of the first light emitting layer and under a lower surface of the third light emitting layer.

7. The electroluminescent display apparatus of claim 1 , further comprising a fourth light emitting layer provided on the first light emitting layer, the second light emitting layer and the third light emitting layer,
wherein the fourth light emitting layer is extended to boundary regions between two adjacent subpixels among the first to third subpixels.

8. The electroluminescent display apparatus of claim 7 , wherein the first light emitting layer comprises a hole injecting layer, a hole transporting layer and an organic light emitting layer emitting light of a first color,
the second light emitting layer comprises a hole injecting layer, a hole transporting layer and an organic light emitting layer emitting light of a second color,
the third light emitting layer comprises a hole injecting layer, a hole transporting layer and an organic light emitting layer emitting light of a third color, and
the fourth light emitting layer comprises at least one of an electron transporting layer and an electron injecting layer.

9. The electroluminescent display apparatus of claim 1 , wherein the second electrode has a same pattern as each of the first light emitting layer provided in the first subpixel, the second light emitting layer provided in the second subpixel, and the third light emitting layer provided in the third subpixel, and
wherein the extended third light emitting layer is disposed on an upper surface of the second electrode provided on the first light emitting layer and an upper surface of the second electrode provided on the second light emitting layer.

10. The electroluminescent display apparatus of claim 9 , wherein the second electrode is disposed on the extended third light emitting layer and has a same pattern as the extended third light emitting layer.

11. The electroluminescent display apparatus of claim 1 , further comprising:
a lens array spaced apart from the substrate; and
an accommodating case accommodating the substrate and the lens array.

12. An electroluminescent display apparatus comprising:
a first pixel and a second pixel each including a first subpixel emitting light of a first color, a second subpixel emitting light of a second color, and a third subpixel emitting light of a third color, the first pixel and the second pixel provided in a substrate;
a first electrode in each of the first subpixel, the second subpixel, and the third subpixel in the substrate;
a bank provided between the first pixel and the second pixel and between two adjacent subpixels among the first to third subpixels to cover an edge of the first electrode and define an emission area;
a first light emitting layer disposed on the first electrode of the first subpixel;
a second light emitting layer disposed on the first electrode of the second subpixel;
a third light emitting layer disposed on the first electrode of the third subpixel; and
a second electrode disposed on the first to third light emitting layers,
wherein the third light emitting layer is extended onto the bank between the first subpixel and the second subpixel and overlaps the first light emitting layer and the second light emitting layer on the bank, and
wherein the extended third light emitting layer does not overlap with the first light emitting layer in the emission area.

13. The electroluminescent display apparatus of claim 12 , wherein the first light emitting layer is extended onto the bank between the second subpixel and the third subpixel and overlaps the second light emitting layer and the third light emitting layer, and
wherein the second light emitting layer is extended onto the bank between the third subpixel and the first subpixel and overlaps the third light emitting layer and the first light emitting layer.

14. The electroluminescent display apparatus of claim 12 , wherein the extended third light emitting layer is disconnected in a boundary region between the first pixel and the second pixel.

15. The electroluminescent display apparatus of claim 12 , wherein the second light emitting layer and the third light emitting layer are disposed between the first subpixel of the first pixel and the first subpixel of the second pixel,
wherein the first light emitting layer and the third light emitting layer are disposed between the second subpixel of the first pixel and the second subpixel of the second pixel, and
wherein the first light emitting layer and the second light emitting layer are disposed between the third subpixel of the first pixel and the third subpixel of the second pixel.

16. The electroluminescent display apparatus of claim 15 , wherein the third light emitting layer disposed between the first subpixel of the first pixel and the first subpixel of the second pixel are spaced apart from the third light emitting layer disposed between the second subpixel of the first pixel and the second subpixel of the second pixel.

17. The electroluminescent display apparatus of claim 15 , wherein the third light emitting layer disposed between the first subpixel of the first pixel and the first subpixel of the second pixel comprises a first portion having a first width and a second portion having a second width smaller than the first width, and
wherein the first portio

Assignees

• Lg Display Co Ltd

Inventors

• Park Jiyoung
• Lee Kyunghoon
• Kim Daehee
• Choi Hyeju

Classifications

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K59/80524

  Transparent cathodes, e.g. comprising thin metal layers · CPC title

• H10K59/805

  Electrodes · CPC title

• H10K59/122

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

• H10K59/35 Primary

  comprising red-green-blue [RGB] subpixels · CPC title