OLED Pixel Electrode Surface Treatment for Interfacial Resistance
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Solution Overview
Problem
The interfacial resistance between the pixel electrode and the intermediate layer in organic light-emitting display devices increases due to hydrophobic materials used in the pixel-defining layer, leading to efficiency deterioration.
Innovation Solution
A method involving the use of a hydrophobic material layer with fluorine groups on the pixel electrode, followed by surface treatment to remove fluorine groups from the pixel electrode surface, maintaining hydrophobicity on the pixel-defining layer while reducing interfacial resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a hydrophobic material is used in the pixel-defining layer to prevent ink residue formation, then ink residue formation is prevented, but the interfacial resistance between the pixel electrode and the intermediate layer increases
Solution Approach 1:
The patent applies different surface properties to different regions of the pixel-defining layer. The upper surface maintains hydrophobicity to prevent ink residue, while the lower surface (facing the pixel electrode) is made hydrophilic through plasma treatment to reduce interfacial resistance. This local differentiation of surface properties resolves the contradiction between preventing ink residue and maintaining low interfacial resistance.
Solution Approach 2:
The patent performs plasma treatment on the lower surface of the pixel-defining layer before depositing the intermediate layer. This preliminary action modifies the surface energy and creates a hydrophilic surface that promotes good adhesion and low interfacial resistance, ensuring optimal interface properties before the intermediate layer is formed.
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
This approach prevents ink residue formation and maintains low interfacial resistance, enhancing the efficiency of the organic light-emitting display device.
Implementation Method 1
surface treatment to remove fluorine groups from the pixel electrode surface
Data Source
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AI summary
A method of manufacturing an organic light-emitting display device is provided. The method includes forming a pixel electrode, forming a hydrophobic material layer on the pixel electrode, wherein the hydrophobic material layer includes a hydrophobic material, forming a pixel-defining layer by patterning the hydrophobic material layer, so as to expose at least a portion of the pixel electrode, and removing the hydrophobic material on the exposed portion of the pixel electrode using surface treatment.