OLED Auxiliary Electrode Surface Roughness
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Solution Overview
Problem
Organic light-emitting display devices face irregular brightness due to high resistance in thin metal electrodes, leading to voltage drops and uneven brightness.
Innovation Solution
The introduction of an auxiliary electrode with surface roughness, electrically connected to the second electrode, improves sheet resistance by forming a patterned insulating layer and using metals like silver, copper, or Ag-Mg alloy, which reduces voltage drops and ensures uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a thin metal electrode with large area is used to build top-emission or dual-emission OLED, then the device structure is simplified and manufacturing is easier, but the electrode has high resistance causing voltage drop and irregular brightness
Solution Approach 1:
The patent introduces an auxiliary electrode patterned on the first electrode to segment the current path. This auxiliary electrode has a top surface with surface roughness that penetrates through the intermediate layer to electrically connect with the second electrode, creating multiple current conduction paths that reduce overall resistance and eliminate voltage drop issues in large-area electrodes
Solution Approach 2:
The patent changes the surface parameter of the auxiliary electrode by creating surface roughness on its top surface. This roughness allows the auxiliary electrode to penetrate through the intermediate layer and establish electrical connection with the second electrode, transforming the electrode from a simple planar structure to one with three-dimensional connectivity that reduces resistance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces voltage drops and achieves uniform brightness by improving the sheet resistance of large electrodes, enhancing the performance of organic light-emitting display devices.
Implementation Method 1
The auxiliary electrode and the second electrode are electrically connected to each other via the surface roughness of the top surface of the auxiliary electrode
Data Source
AI summary
An organic light-emitting display device is disclosed. The display device includes a substrate; a first electrode on the substrate; an auxiliary electrode patterned on and insulated from the first electrode, and having a top surface that has surface roughness; an intermediate layer on the first electrode and the auxiliary electrode; and a second electrode on the intermediate layer and facing the first electrode. The auxiliary electrode and the second electrode are electrically connected to each other via the surface roughness of the top surface of the auxiliary electrode.