Organic light emitting display device with auxiliary electrode and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-10854699-B2
Application number	US-201816112330-A
Country	US
Kind code	B2
Filing date	Aug 24, 2018
Priority date	Oct 29, 2015
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

Discussed is an organic light emitting display device with auxiliary electrode and method of manufacturing the same according to the embodiments. The present disclosure is directed to provide a top emission type transparent organic light emitting display device and a method of manufacturing the same, which provides an area of an auxiliary electrode that effectively reduces a resistance of a cathode electrode, and decreases the number of masks, thereby simplifying the manufacturing process.

First claim

What is claimed is:

1. A method of manufacturing an organic light emitting display device, the method comprising:
forming an anode electrode on a substrate;
forming a first bank on the anode electrode;
forming an auxiliary electrode on the first bank, wherein the auxiliary electrode includes a lower auxiliary electrode, an upper auxiliary electrode and a cover auxiliary electrode sequentially stacked in a vertical direction, and wherein the cover auxiliary electrode has an open side exposing a side surface of the upper auxiliary electrode;
removing the upper auxiliary electrode selectively to form a separation space between the cover auxiliary electrode and the lower auxiliary electrode, wherein the lower auxiliary electrode, the separation space and the cover auxiliary electrode are sequentially stacked in the vertical direction;
forming a second bank on the auxiliary electrode, wherein the second bank exposes the open side of the cover auxiliary electrode;
forming an organic emission layer on the anode electrode, wherein the organic emission layer is not deposited in the separation space; and
forming a cathode electrode on the organic emission layer, wherein the cathode electrode is deposited in the separation space to directly contact the lower auxiliary electrode within the separation space, wherein the lower auxiliary electrode, the cathode electrode, the separation space and the cover auxiliary electrode are sequentially stacked in the vertical direction.

2. The method of claim 1 , wherein the forming of the first bank comprises forming the first bank by using a half-tone mask to have a relatively thicker thickness on one side and on another side of the anode electrode and have a relatively thinner thickness in another region.

3. The method of claim 1 , further comprising:
after the forming of the second bank, ashing the first bank and the second bank to externally expose the anode electrode in a region other than a one side and another side of the anode electrode.

4. The method of claim 1 , wherein the forming the auxiliary electrode comprises:
forming the auxiliary electrode; and
forming a photoresist pattern on the auxiliary electrode to expose the side surface of the upper auxiliary electrode,
wherein the removing of the upper auxiliary electrode in a certain area of the auxiliary electrode is conducted by using the photoresist pattern as a mask, and
wherein the forming of the second bank is conducted by using the photoresist pattern.

5. The method of claim 1 , wherein the forming the auxiliary electrode forms the auxiliary electrode to surround an exposed region of the anode electrode.

6. The method of claim 5 , wherein the auxiliary electrode is formed to surround less than four sides of each suhpixel of the organic light emitting display device.

7. The method of claim 1 , wherein the cover auxiliary electrode encloses an upper surface of the separation space and a side surface of the separation space that is opposite to the open side of the separation space, and the lower auxiliary electrode encloses a lower surface of the separation space.

8. The method of claim 7 , wherein the cathode extends through the open side and into the separation space without contacting the cover auxiliary electrode.

9. A method of manufacturing an organic light emitting display device, the method comprising:
forming an anode electrode on a substrate;
forming a first bank on the anode electrode;
forming an auxiliary electrode on the first bank, wherein the auxiliary electrode includes a lower auxiliary electrode, an upper auxiliary electrode and a cover auxiliary electrode, and wherein the cover auxiliary electrode has an open side exposing a side surface of the upper auxiliary electrode;
removing the upper auxiliary electrode selectively to form a separation space between the cover auxiliary electrode and the lower auxiliary electrode;
forming a second bank on the auxiliary electrode, wherein the second bank exposes the open side of the cover auxiliary electrode;
after the forming of the second bank, ashing the first bank and the second bank to externally expose the anode electrode in a region other than a one side and another side of the anode electrode;
forming an organic emission layer on the anode electrode, wherein the organic emission layer is not deposited in the separation space; and
forming a cathode electrode on the organic emission layer, wherein the cathode electrode is deposited in the separation space to directly contact the lower auxiliary electrode.

10. A method of manufacturing an organic light emitting display device, the method comprising:
forming an anode electrode on a substrate;
forming a first bank on the anode electrode;
forming an auxiliary electrode on the first bank, wherein the auxiliary electrode includes a lower auxiliary electrode, an upper auxiliary electrode and a cover auxiliary electrode, and wherein the cover auxiliary electrode has an open side exposing a side surface of the upper auxiliary electrode;
removing the upper auxiliary electrode selectively to form a separation space between the cover auxiliary electrode and the lower auxiliary electrode;
forming a second bank on the auxiliary electrode, wherein the second bank exposes the open side of the cover auxiliary electrode;
forming an organic emission layer on the anode electrode, wherein the organic emission layer is not deposited in the separation space; and
forming a cathode electrode on the organic emission layer; wherein the cathode electrode is deposited in the separation space to directly contact the lower auxiliary electrode,
wherein the forming the auxiliary electrode comprises:
forming the auxiliary electrode; and
forming a photoresist pattern on the auxiliary electrode to expose one side surface of the upper auxiliary electrode,
wherein the removing of the upper auxiliary electrode in a certain area of the auxiliary electrode is conducted by using the photoresist pattern as a mask, and
wherein the forming of the second bank is conducted by using the photoresist pattern.

Assignees

• Lg Display Co Ltd

Inventors

• Lee Joonsuk
• Kim Sejune

Classifications

• H10K59/80522

  combined with auxiliary electrodes · CPC title

• H10K59/80516

  combined with auxiliary electrodes, e.g. ITO layer combined with metal lines · CPC title

• H10K59/131

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

• H10K59/1315 Primary

  comprising structures specially adapted for lowering the resistance · CPC title

• H01L27/3213

  Electricity · mapped topic