Organic light emitting display device

Patent metadata

Field	Value
Publication number	US-9997734-B2
Application number	US-201715592844-A
Country	US
Kind code	B2
Filing date	May 11, 2017
Priority date	May 23, 2016
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

Embodiments disclosed herein relate to a light emitting display device comprising a plurality of subpixels, the plurality of subpixels including at least a first subpixel and a second subpixel. The light emitting display device includes a common layer shared by a first light emitting diode of the first subpixel and a second light emitting diode of the second subpixel, the common layer disposed between a first anode electrode and a first cathode electrode of the first subpixel and between a second anode electrode and a second cathode electrode of the second subpixel, and an auxiliary electrode disposed on a different layer from the common layer, the first anode electrode, the first cathode electrode, the second anode electrode, and the second cathode electrode, the auxiliary electrode connected to the common layer through a contact hole.

First claim

What is claimed is:

1. An electroluminescent display device comprising:
a thin film transistor on a surface of a substrate facing in a first direction;
a protective layer on the thin film transistor;
a planarizing layer covering a surface of the protective layer facing in the first direction;
a first electrode disposed on a surface of the planarizing layer facing in the first direction and connected to the thin film transistor;
a bank on one side of the first electrode;
a light emitting unit disposed on a surface of the first electrode, the light emitting unit including a transporting layer and a light emitting layer;
a second electrode on a surface of the light emitting unit facing in the first direction; and
an auxiliary electrode disposed below the first electrode and the bank, a first area of the auxiliary electrode facing a portion of the bank in the first direction, the auxiliary electrode directly connected to the transporting layer,
wherein a second area of the auxiliary electrode faces a portion of the first electrode in the first direction.

2. The electroluminescent display device according to claim 1 , wherein the auxiliary electrode is disposed between the protective layer and the planarizing layer.

3. The electroluminescent display device according to claim 2 , wherein the transporting layer and the auxiliary electrode are connected to each other through a contact hole penetrating the planarizing layer and the bank.

4. The electroluminescent display device according to claim 1 , wherein the transporting layer includes at least one of a hole injecting layer and a hole transporting layer.

5. The electroluminescent display device according to claim 1 , wherein the auxiliary electrode is electrically connected to the first electrode.

6. The electroluminescent display device according to claim 1 , further comprising:
a red light emitting layer of a red sub pixel, a green light emitting layer of a green sub pixel, and a blue light emitting layer of a blue sub pixel,
wherein the red light emitting layer, the green light emitting layer, and the blue light emitting layer include at least one phosphorescent material.

7. The electroluminescent display device according to claim 1 , wherein the auxiliary electrode is formed of at least one of aluminum (Al), silver (Ag), calcium (Ca), magnesium (Mg), platinum (Pt), gold (Au), copper (Cu), and indium tin oxide (ITO).

8. An organic light emitting display device comprising:
an organic layer corresponding to a red sub pixel, a green sub pixel, and a blue sub pixel; and
organic light emitting layers, each corresponding to a respective one of the red sub pixel, the green sub pixel, and the blue sub pixel,
wherein the organic layer and the organic light emitting layers are disposed between a first electrode and a second electrode,
wherein the organic layer is in contact with an auxiliary electrode below the first electrode through a contact hole penetrating a bank which defines at least one of the red sub pixel, the green sub pixel, and the blue sub pixel,
wherein a first area of the auxiliary electrode overlaps with a portion of the first electrode and a second area of the auxiliary electrode overlaps with a portion of the bank.

9. The organic light emitting display device according to claim 8 , further comprising:
a thin film transistor, a protective layer, and a planarizing layer configured below the first electrode,
wherein the auxiliary electrode is disposed between the protective layer and the first electrode.

10. The organic light emitting display device according to claim 9 , wherein the organic layer includes at least one of a hole injecting layer and a hole transporting layer.

11. The organic light emitting display device according to claim 9 , wherein the thin film transistor includes a gate electrode, a source electrode, and a drain electrode, and wherein the auxiliary electrode forms a storage capacitance together with the source electrode or the drain electrode.

12. A light emitting display device comprising a plurality of subpixels, the plurality of subpixels including at least a first subpixel and a second subpixel, the light emitting display device comprising:
a common layer shared by a first light emitting diode of the first subpixel and a second light emitting diode of the second subpixel, the common layer disposed between a first anode electrode and a first cathode electrode of the first subpixel and between a second anode electrode and a second cathode electrode of the second subpixel; and
an auxiliary electrode disposed on a different layer from the common layer, the first anode electrode, the first cathode electrode, the second anode electrode, and the second cathode electrode, the auxiliary electrode connected to the common layer through a contact hole,
wherein a first area of the auxiliary electrode overlaps with a portion of the first light emitting diode and a second area of the auxiliary electrode overlaps with a portion of the second light emitting diode.

13. The light emitting display device of claim 12 , wherein the first area of the auxiliary electrode overlaps with a portion of the first anode electrode and the second area of the auxiliary electrode overlaps with a portion of the second anode electrode.

14. The light emitting display device of claim 12 , wherein the contact hole penetrates a bank separating the first light emitting diode and the second light emitting diode.

15. The light emitting display device according to claim 12 , further comprising:
a thin film transistor to control an operation of one of the first light emitting diode and the second light emitting diode; and
a protective layer covering the thin film transistor, the protective layer formed between the thin film transistor and the one of the first light emitting diode and the second light emitting diode, wherein the auxiliary electrode is disposed between the protective layer and the one of the first light emitting diode and the second light emitting diode.

16. The light emitting display device according to claim 12 , wherein the common layer includes at least one of a hole injecting layer and a hole transporting layer.

17. The light emitting display device according to claim 12 , wherein the common layer includes an organic material.

Assignees

• Lg Display Co Ltd
• Lg Display Co Ltd

Inventors

• Kwon Sunkap
• Han Kyuil

Classifications

• H10K59/80516

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

• H10K50/17

  Carrier injection layers · CPC title

• H10K50/11

  characterised by the electroluminescent [EL] layers · CPC title

• H10K59/805 Primary

  Electrodes · CPC title

• H01L27/3262

  Electricity · mapped topic