Light Emitting Display Device

Patent metadata

Field	Value
Publication number	US-2024260355-A1
Application number	US-202318475773-A
Country	US
Kind code	A1
Filing date	Sep 27, 2023
Priority date	Jan 30, 2023
Publication date	Aug 1, 2024
Grant date	—

Abstract

A light emitting display device includes a substrate including a display area including a plurality of sub-pixels and a non-display area surrounding the display area, a plurality of first electrodes provided in the plurality of sub-pixels, a second electrode facing the plurality of first electrodes and extending over the entire display area and a part of the non-display area, an interlayer including a plurality of stacks provided between the plurality of first electrodes and the second electrode and a charge generation layer between the plurality of stacks, a first connection electrode provided in the non-display area and connected to the second electrode, and a second connection electrode disposed closer to the display area than the first connection electrode and connected to the charge generation layer, thus stabilizing the potential of a common layer having high mobility by using a connection electrode to prevent lateral leakage current caused by the common layer.

First claim

What is claimed is:

1 . A light emitting display device comprising:
a substrate including a display area having a plurality of sub-pixels and a non-display area surrounding the display area; a plurality of first electrodes disposed at the plurality of sub-pixels; a second electrode facing the plurality of first electrodes over the display area and a part of the non-display area; an interlayer including a plurality of stacks disposed between the plurality of first electrodes and the second electrode and a charge generation layer disposed between the plurality of stacks; a first connection electrode disposed at the non-display area and connected to the second electrode; and a second connection electrode disposed closer to the display area than the first connection electrode and connected to the charge generation layer.

2 . The light emitting display device of claim 1 , wherein the charge generation layer overlaps with the second connection electrode, and an edge of the charge generation layer is positioned between the second connection electrode and the first connection electrode.

3 . The light emitting display device of claim 1 , wherein the second connection electrode has a closed loop shape, and
wherein the second connection electrode and the charge generation layer have a connection region in the closed loop shape corresponding to a shape of the second connection electrode.

4 . The light emitting display device of claim 1 , wherein the second connection electrode and the charge generation layer have a connection region in a line along at least one side of the substrate.

5 . The light emitting display device of claim 3 , wherein the second connection electrode and the charge generation layer have connection regions in a plurality of areas spaced apart from each other at least along the shape of the second connection electrode.

6 . The light emitting display device of claim 1 , wherein the second connection electrode includes a plurality of second connection electrodes spaced apart from each other and the plurality of second connection electrodes are provided at the display area.

7 . The light emitting display device of claim 6 , further comprising a bank exposing light emitting parts of the plurality of first electrodes,
wherein the plurality of second connection electrodes penetrate the bank.

8 . The light emitting display device of claim 2 , wherein each of the plurality of stacks includes a hole transport layer, an emission layer, and an electron transport layer, and
wherein an edge of the electron transport layer corresponds to or is positioned outside an edge of the hole transport layer.

9 . The light emitting display device of claim 8 , wherein the emission layers of the plurality of stacks emit a same color as at least one of the plurality of sub-pixels.

10 . The light emitting display device of claim 8 , wherein the charge generation layer, an electron transport layer of an upper stack of the charge generation layer, and the second electrode are sequentially stacked on the second connection electrode.

11 . The light emitting display device of claim 1 , wherein the plurality of sub-pixels includes first to third sub-pixels adjacent to each other,
the first sub-pixel includes a first color emission layer in each of the plurality of stacks with the charge generation layer interposed between the plurality of stacks, the second sub-pixel includes a second color emission layer in each of the plurality of stacks with the charge generation layer interposed between the plurality of stacks, and the third sub-pixel includes a third color emission layer in each of the plurality of stacks with the charge generation layer interposed between the plurality of stacks.

12 . The light emitting display device of claim 1 , wherein the first connection electrode is connected to a power line through which a low-potential voltage is supplied, and the second connection electrode is connected to a reset voltage line through which a reset voltage is supplied.

13 . The light emitting display device of claim 1 , wherein the second connection electrode is positioned on a same layer as the plurality of first electrodes.

14 . The light emitting display device of claim 1 , wherein the second connection electrode is positioned on a different layer from the plurality of first electrodes.

15 . A light emitting display device comprising:
a substrate including a display area having a plurality of sub-pixels and a non-display area surrounding the display area; a plurality of first electrodes disposed at the plurality of sub-pixels; a first stack including a first common layer, a first emission layer, and a second common layer on the plurality of first electrodes; a third common layer disposed on the first stack; a second stack including a fourth common layer, a second emission layer, and a fifth common layer on the third common layer; a second electrode provided on the second stack over the entire display area and a part of the non-display area; a first connection electrode disposed on a same layer as the plurality of first electrodes at the non-display area and connected to the second electrode; and a second connection electrode disposed on a same layer as the plurality of first electrodes disposed to closer to the display area than the first connection electrode and connected to at least one of the first common layer, the third common layer, and the fourth common layer.

16 . The light emitting display device of claim 15 , wherein the third common layer includes metal ions.

17 . The light emitting display device of claim 15 , wherein the plurality of sub-pixels includes first to third sub-pixels adjacent to each other,
the first emission layer and the second emission layer of the first sub-pixel include a first color emission layer emitting light of a first color, the first emission layer and the second emission layer of the second sub-pixel include a second color emission layer emitting light of a second color, and the first emission layer and the second emission layer of the third sub-pixel include a third color emission layer emitting light of a third color.

18 . The light emitting display device of claim 15 , wherein the first connection electrode is connected to a power line through which a low-potential voltage is supplied, and the second connection electrode is connected to a reset voltage line through which a reset voltage is supplied.

19 . The light emitting display device of claim 15 , wherein each of the first common layer and the fourth common layer includes a hole transport layer,
each of the second common layer and the fifth common layer includes an electron transport layer, and the third common layer includes a charge generation layer.

20 . The light emitting display device of claim 15 , wherein the third common layer overlaps with the second connection electrode, and an edge of the third common layer is positioned between the second connection electrode and the first connection electrode.

21 . The light emitting display device of claim 15 , wherein the second connection electrode is positioned in the non-display area inside the second connection electrode and has a closed loop shape.

22 . The light emitting display device of claim 15 , wherein the second connection electrode includes a plurality of second connection electrodes spaced apart from each other and the plurality of second connection electrodes are provide

Assignees

• Lg Display Co Ltd

Inventors

• Kwak Chang Hwan
• Choi Yun Hee
• Kwon Sun Kap
• Park Jin Ho

Classifications

• H10K59/805

  Electrodes · CPC title

• H10K59/35

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

• H10K59/30

  Devices specially adapted for multicolour light emission · CPC title

• H10K59/131 Primary

  Interconnections, e.g. wiring lines or terminals · CPC title

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title