System and method for matching electrode resistances in OLED light panels

Patent metadata

Field	Value
Publication number	US-10797258-B2
Application number	US-201916451576-A
Country	US
Kind code	B2
Filing date	Jun 25, 2019
Priority date	Dec 13, 2012
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

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. A method of fabricating an electrode for an organic light emitting device, comprising:
obtaining a first electrode material source;
disposing the first electrode material source over a substrate;
arranging the substrate on a substrate jig at an angle θ relative to a line normal to the substrate from the first electrode material source, where 0<θ<90°; and
depositing the first electrode material from the first electrode material source onto the substrate to form a first electrode having a non-uniform thickness.

2. The method of claim 1 , wherein the thickness is greater on one end of the first electrode and decreases gradually to the other end of the first electrode.

3. The method of claim 1 , further comprising:
depositing a plurality of layers of the first electrode material through each of a series of shadow masks, each shadow mask in the series of shadow masks having a smaller area through which the electrode material is deposited than the previous shadow mask in the series.

4. The method of claim 1 , further comprising:
passing the substrate through a plurality of positions in a linear deposition system; and
at each position, depositing the first electrode material over the substrate at a different thickness and over a different portion of an area of the substrate than at each of the other positions.

5. The method of claim 4 , further comprising moving the substrate through the plurality of positions at a varied speed to cause the electrode material to be deposited at a different thickness at each position.

6. The method of claim 1 , further comprising:
depositing the first electrode material to form an electrode contact for an electrode on a single edge of the electrode.

7. The method of claim 1 , further comprising:
disposing a mask between a deposition device used to deposit the electrode material and the substrate concurrently with depositing the first electrode material over the substrate.

8. The method of claim 1 , wherein the first electrode material is deposited over the substrate in multiple passes of the substrate beneath a deposition device used to deposit the first electrode material over the substrate.

9. The method of claim 1 , wherein the first electrode material is deposited over the substrate in a single pass of the substrate beneath a deposition device used to deposit the first electrode material over the substrate to form the first electrode.

10. The method of claim 1 , wherein the depositing the first electrode material is performed within a linear vacuum deposition system.

11. The method of claim 1 , further comprising:
selecting the non-uniform thickness to result in a selected gradient resistance of the first electrode after deposition of the first electrode material.

12. The method of claim 1 , further comprising:
moving the substrate relative to an electrode material deposition device at a constant rate.

Assignees

• Universal Display Corp

Inventors

• Pang Huiqing
• Ma Ruiqing

Classifications

• H10K50/15

  Hole transporting layers · CPC title

• H10K50/11 Primary

  characterised by the electroluminescent [EL] layers · CPC title

• H10K2101/40

  Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers · CPC title

• H10K50/805

  Electrodes · CPC title

• H01J1/62

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