Organic light-emitting display device

Patent metadata

Field	Value
Publication number	US-10650745-B2
Application number	US-201715667257-A
Country	US
Kind code	B2
Filing date	Aug 2, 2017
Priority date	Aug 24, 2016
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

An organic light-emitting display (OLED) device includes an anode, an organic emitting layer on the anode, and a cathode on the organic emitting layer. The cathode is configured to transmit at least a part of light emitted from the organic emitting layer and is formed of an alloy having a first metal and an oxide of a second metal. The cathode contains an alloy of a metal and a metal oxide and has an increased thickness, such that the process margin for the cathode can be improved.

First claim

What is claimed is:

1. An organic light-emitting display device comprising:
an anode;
an organic emitting layer on the anode; and
a cathode, on the organic emitting layer, to transmit at least a part of light emitted from the organic emitting layer,
wherein the cathode has a single layer of an alloy having a first metal and an oxide of a second metal to have the cathode have a thickness equal to or greater than 250 Å to about 400 Å,
wherein the cathode has a specific light transmissive characteristics that achieve a top emission type display configuration using the alloy of the first metal and the oxide of the second metal that exhibits improved thickness characteristics while achieving comparable characteristics for light emission efficiency, color coordinates, viewing angle and lifespan when compared to a cathode made of AgMg alloy, and
wherein the cathode having the improved thickness characteristics results in a better cathode deposition uniformity and an improved margin of error during manufacturing to result in a higher manufacturing yield.

2. The organic light-emitting display device of claim 1 , wherein the first metal is at least one among Ag, Al and Cu.

3. The organic light-emitting display device of claim 1 , wherein the second metal is at least one among Nd, Ta, Nb, Mo, W, Ti, Si, B, Ni, Au, Cu, Al, Sn, Mg, Pt and Pd.

4. The organic light-emitting display device of claim 1 , wherein a rate of change in a transmittance of the cathode per 50 Å of the thickness of the cathode is equal to or less than 1.5%.

5. The organic light-emitting display device of claim 4 , wherein a thickness uniformity of the cathode is within ±10%.

6. The organic light-emitting display device of claim 1 , wherein the alloy has a ratio of the first metal to the oxide of the second metal of 2:1 or more.

7. The organic light-emitting display device of claim 6 , wherein the alloy has a ratio of the first metal to the oxide of the second metal of 3:1 to 5:1.

8. The organic light-emitting display device of claim 1 , wherein the cathode has no additional auxiliary line for supplying power, and
wherein the cathode is configured as a single film.

9. The organic light-emitting display device of claim 1 , further comprising:
a capping layer on the cathode,
wherein a refractive index of the capping layer is based on a refractive index of the cathode.

10. The organic light-emitting display device of claim 9 , wherein the refractive index of the cathode is within a range from 0.2 to 1.8.

11. The organic light-emitting display device of claim 9 , wherein a difference (dN) between the refractive index of the cathode and the refractive index of the capping layer is within a range of 0<dN<1.6.

12. An organic light-emitting display device comprising:
an anode;
an organic emitting layer on the anode;
a cathode on the organic emitting layer, and having a single layer of an alloy having a first metal and an oxide of a second metal; and
a capping layer on the cathode,
wherein a thickness of the cathode is equal to or greater than 250 Å to about 400 Å,
wherein a difference (dN) between a refractive index of the cathode and a refractive index of the capping layer is within a range of 0<dN<1.6,
wherein the cathode has a specific light transmissive characteristics that achieve a top emission type display configuration using the alloy of the first metal and the oxide of the second metal that exhibits improved thickness characteristics while achieving comparable characteristics for light emission efficiency, color coordinates, viewing angle and lifespan when compared to a cathode made of AgMg alloy, and
wherein the cathode having the improved thickness characteristics results in a better cathode deposition uniformity and an improved margin of error during manufacturing to result in a higher manufacturing yield.

13. The organic light-emitting display device of claim 12 , wherein the second metal is at least one among Nd, Ta, Nb, Mo, W, Ti, Si, B, Ni, Au, Cu, Al, Sn, Mg, Pt and Pd.

14. The organic light-emitting display device of claim 12 , wherein the first metal is at least one among Ag, Al and Cu.

15. An organic light-emitting display device comprising:
a plurality of pixels in a display area of a substrate,
each of the plurality of pixels having an organic light emitting layer between a cathode and an anode, and
the cathode having specific light transmissive characteristics that achieve a top emission type display configuration and having a single layer of an oxide metal alloy that exhibits improved thickness characteristics while achieving comparable characteristics for light emission efficiency, color coordinates, viewing angle and lifespan when compared to a cathode made of AgMg alloy,
wherein a thickness of the oxide metal alloy cathode is at least 250 Å, and
wherein the oxide metal alloy cathode having the improved thickness characteristics results in a better cathode deposition uniformity and an improved margin of error during manufacturing to result in a higher manufacturing yield.

16. The organic light-emitting display device of claim 15 , wherein the oxide metal alloy cathode comprises an oxide of a metal selected from a group consisting of Nd, Ta, Nb, Mo, W, Ti, Si, B, Ni, Au, Cu, Al, Sn, Mg, Pt and Pd, and comprises an additional metal selected from a group consisting of Ag, Al and Cu.

17. The organic light-emitting display device of claim 15 , wherein a refractive index of the oxide metal alloy cathode is within a range from 0.2 to 1.8.

Assignees

• Lg Display Co Ltd
• Univ Industry Cooperation Group Kyung Hee Univ

Inventors

• Kwon Sunkap
• Kwon Janghyuk
• Park Mijin
• Kim Seongkeun

Classifications

• G09G3/3291

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G3/3258 Primary

  with pixel circuitry controlling the voltage across the light-emitting element · CPC title

• H01L51/5234

  Electricity · mapped topic

• H01L2251/5315

  Electricity · mapped topic

• H01L51/5072

  Electricity · mapped topic