Organic light emitting display device reducing leakage current generated between pixels

Patent metadata

Field	Value
Publication number	US-10411079-B2
Application number	US-201615174707-A
Country	US
Kind code	B2
Filing date	Jun 6, 2016
Priority date	Jun 25, 2015
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

Provided is an organic light emitting display device including at least two organic light emitting elements disposed adjacent to each other, respectively including an anode, an organic light emitting unit, and a cathode, and sharing at least one common layer in the organic light emitting unit. The at least one common layer includes a characteristic degradation area that reduces or minimizes an amount of leakage current generated between the at least two organic light emitting elements.

First claim

What is claimed is:

1. An organic light emitting display device comprising: at least two organic light emitting elements adjacent to each other, respectively including an anode, a cathode, and an organic light emitting unit comprising a plurality of organic layers including an organic light emitting layer, wherein the at least two organic light emitting elements share at least one common layer among the plurality of organic layers in the organic light emitting elements, a bank between the at least two organic light emitting elements; an area on the common layer corresponding to where at least one of the organic light emitting layers of the at least two organic light emitting elements adjacent to each other overlap, and a characteristic degradation area formed on the area in the common layer corresponding to where the at least one of the organic light emitting layers of the at least two organic light emitting elements adjacent to each other overlap, wherein the characteristic degradation area is configured to reduce an amount of leakage current generated between the two organic light emitting element, and wherein the characteristic degradation area is disposed so as not to overlap with the anode, and wherein a width of the characteristic degradation area has a value of 10% to 60% of a maximum straight distance from one side surface of the bank covering an end of the anode in one of the at least two organic light emitting elements to another side surface of the bank covering an end of the anode in a remaining one of the at least two organic light emitting elements, wherein the characteristic degradation area extends throughout the plurality of organic layers in the area in the common layer corresponding to where the organic light emitting layers of the at least two organic light emitting elements adjacent to each other overlap.

2. The organic light emitting display device according to claim 1 , further comprising:
wherein the at least one common layer covers the bank.

3. The organic light emitting display device according to claim 2 , wherein the characteristic degradation area corresponds to at least one portion of the bank.

4. The organic light emitting display device according to claim 3 , wherein each of a distance from the one side surface of the bank to the characteristic degradation area and a distance from the other side surface of the bank to the characteristic degradation area has a value of 20% or more of the maximum straight distance.

5. The organic light emitting display device according to claim 3 , wherein the characteristic degradation area is configured by ultraviolet (UV) ray irradiation.

6. The organic light emitting display device according to claim 3 , wherein the characteristic degradation area is a darker in color than another area of the at least one common layer.

7. The organic light emitting display device according to claim 3 , wherein a maximum current flowing in the characteristic degradation area is lower than a maximum current flowing in another area of the at least one common layer.

8. The organic light emitting display device according to claim 3 , wherein the at least one common layer includes at least one among a hole injecting layer, a hole transporting layer, the organic light emitting layer, an electron transporting layer, an electron injecting layer, and a charge generating layer.

9. An organic light emitting display device comprising: a first anode and a second anode separated from each other on a substrate; a bank between the first anode and the second anode, the bank covering an end of the first anode and an end of the second anode; an organic light emitting unit comprising a plurality of organic layers including at least one common layer covering the first anode, the second anode, and the bank; and a cathode on the organic light emitting unit, wherein a characteristic degradation area is formed in each of the plurality of organic layers disposed on the bank including the one common layer, wherein a current flow characteristic of the characteristic degradation area is different from a current flow characteristic of an area corresponding to the first anode or the second anode included in organic layers disposed on the first anode or the second anode, and wherein the characteristic degradation area is disposed so as not to overlap with the anode, and wherein a width of the characteristic degradation area has a value of 10% to 60% of a maximum straight distance from one side surface of the bank covering an end of the anode in one of the at least two organic light emitting elements to another side surface of the bank covering an end of the anode in a remaining one of the at least two organic light emitting elements, wherein the characteristic degradation area is a darker on color than the area corresponding to the first anode or the second anode.

10. The organic light emitting display device according to claim 9 , wherein a maximum current flowing in the characteristic degradation area is lower than a maximum current flowing in the area corresponding to the first anode or the second anode.

11. The organic light emitting display device according to claim 10 , wherein the characteristic degradation area is configured by ultraviolet (UV) ray irradiation.

12. The organic light emitting display device according to claim 10 , wherein the at least one common layer includes at least one among a hole injecting layer, a hole transporting layer, an organic light emitting layer, an electron transporting layer, an electron injecting layer, and a charge generating layer.

13. An organic light emitting display device comprising: two adjacent pixels; a bank that separates the two adjacent pixels; a plurality of organic common layers covering and sharing the two adjacent pixels and the bank; and an organic light emitting layer on the common layer in each of the two adjacent pixels, and a characteristic degradation area on the bank in each of the plurality of organic common layers, wherein the characteristic degradation partial area in each of the plurality of organic common layers is configured to reduce an amount of leakage current flowing in each of the plurality of organic common layers, and properties of organic materials constituting the characteristic degradation area is different from properties of organic materials constituting a rest of each of the plurality of organic common layers, and wherein the characteristic degradation area is disposed so as not to overlap with the anode, and wherein a width of the characteristic degradation area has a value of 10% to 60% of a maximum straight distance from one side surface of the bank covering an end of the anode in one of the at least two organic light emitting elements to another side surface of the bank covering an end of the anode in a remaining one of the at least two organic light emitting elements, wherein the organic light emitting layer corresponding to the characteristic degradation area is also configured to reduce an amount of leakage current, wherein properties of organic materials constituting the organic light emitting layer corresponding to the characteristic degradation area are also different from properties of organic materials constituting a rest of the organic light emitting layer.

14. The organic light emitting display device according to claim 13 , wherein the characteristic degradation area is formed as a result of improper deposition of organic light emitting material due to a mask alignment error.

15. The organic light emitting display device according to claim 13 , wherein a structure where element characteristics are degraded is formed by irradiating

Assignees

• Lg Display Co Ltd

Inventors

• Cho Jungmo
• Seok Hanbyeol
• Lee Sohee

Classifications

• H01L27/3246 Primary

  Electricity · mapped topic

• H01L51/5088

  Electricity · mapped topic

• H01L51/5056

  Electricity · mapped topic

• H10K50/15

  Hole transporting layers · CPC title

• H10K50/17 Primary

  Carrier injection layers · CPC title