System and method for matching electrode resistances in OLED light panels

Patent metadata

Field	Value
Publication number	US-9673412-B2
Application number	US-201514852072-A
Country	US
Kind code	B2
Filing date	Sep 11, 2015
Priority date	Dec 13, 2012
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

Provided are an OLED device and a method of manufacturing the OLED device that may provide improved luminance uniformity. The disclosed OLED may have a first electrode that has a first sheet resistance Rs, and a second electrode that has a second sheet resistance, wherein the second sheet resistance may be in the range of 0.3 Rs-1.3 Rs. In addition, the disclosed OLED may have a plurality of equal potential difference between points on a first electrode and a second electrode. The equal potential difference may be provided by a gradient resistance formed on at least one of the electrodes.

First claim

The invention claimed is:

1. An organic light emitting device, comprising:
a first electrode;
a second electrode; and
an organic emissive layer disposed between the first electrode and the second electrode;
wherein, for each of a plurality of points on the first electrode, the potential difference between the point on the first electrode and a corresponding point on the second electrode, is within 5% of the potential difference between each of the other plurality of points on the first electrode and a corresponding point on the second electrode;
wherein, for each point on the first electrode, the point and the corresponding point on the second electrode lie on a line that is substantially perpendicular to the first electrode and to the second electrode.

2. The device of claim 1 , wherein each potential difference is approximately equal to each of the other plurality of points on the first electrode and a corresponding point on the second electrode.

3. The device of claim 1 , wherein each potential difference is within about 1% of each of the other plurality of points on the first electrode and a corresponding point on the second electrode.

4. The device of claim 1 , wherein the first electrode has an electrode contact disposed on a single edge of the first electrode.

5. The device of claim 4 , wherein the electrode contact edge is less than about 25% of the total circumference of the first electrode.

6. The device of claim 1 , wherein an electrode contact for the first electrode is on a single edge of the first electrode, and a contact for the second electrode is on a single edge of the second electrode that is opposite the electrode contact for the first electrode.

7. The device of claim 1 , wherein at least one of the first and second electrodes has a gradient resistance where the gradient is in a current flow direction.

8. The device of claim 7 , wherein the electrode having a gradient resistance further has an electrical contact and the electrical contact is at the end with the lowest resistance.

9. The device of claim 1 , wherein the device has at least one dimension of at least 2 cm.

10. The device of claim 1 , wherein the device has at least one dimension of at least 10 cm.

11. The device of claim 1 , wherein an active area of the device is at least 50 cm2.

12. The device of claim 1 , wherein an active area of the device is at least 72 cm2.

13. The device of claim 1 , further comprising:
a transport layer disposed between the first electrode and the second electrode, the transport layer having a non-uniform thickness.

14. The device of claim 1 , further comprising an electrode contact for a first electrode located on a single edge of the first electrode, and an electrode contact for the second electrode located on a single edge of the second electrode, wherein the two electrode contacts are located at approximately the farthest locations from one another.

15. The device of claim 1 , wherein the device outputs at a luminance uniformity greater than 80% at 1,000 cd/m2.

16. The device of claim 1 , wherein the device has a 100% fill factor.

Assignees

• Universal Display Corp

Inventors

• Pang Huiqing
• Ma Ruiqing

Classifications

• H01J1/62

  Luminescent screens; Selection of materials for luminescent coatings on vessels · CPC title

• H10K50/15

  Hole transporting layers · CPC title

• H10K50/11 Primary

  characterised by the electroluminescent [EL] layers · CPC title

• H01L2251/55

  Electricity · mapped topic

• H01L51/5225

  Electricity · mapped topic