OLED Anode Oxidized Surface Layer for Uniformity
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Solution Overview
Problem
Organic light-emitting diode (OLED) displays face challenges with uniformity of organic layers within pixels due to non-uniform conductive anode surfaces, leading to current shunting and leakage issues, which affect fill factor and layer thickness.
Innovation Solution
A conducting inorganic anode with an oxidized surface layer is treated using oxygen plasma to create a non-conductive, hole-transporting surface, preventing current shunting and smoothing the anode edges, and the process involves forming a patterned anode on a TFT substrate, treating it with oxygen plasma, and applying organic active layers via liquid deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conducting inorganic anode is used to provide electrical conductivity, then electrical conductivity is improved, but current shunting and leakage occur due to non-uniform surface
Solution Approach 1:
The patent applies a hole-transporting material layer selectively on the anode surface to create local functional differentiation. The anode maintains its conducting properties in the bulk while the surface layer provides uniform hole transport, resolving the contradiction between electrical conductivity and surface uniformity through spatial functional separation.
Solution Approach 2:
The patent creates a composite structure combining the conducting inorganic anode material with an organic hole-transporting material layer. This composite approach allows the system to simultaneously exhibit electrical conductivity from the inorganic substrate and surface uniformity with controlled hole transport from the organic layer.
2Ease of manufacture
If liquid deposition technique is used to form organic layers, then manufacturing flexibility is improved, but layer uniformity is affected by anode surface irregularities
Solution Approach 1:
The patent applies the hole-transporting material layer on the anode surface before depositing the organic active layers. This preliminary action creates a uniform foundation that compensates for underlying surface irregularities, ensuring uniform organic layer formation while maintaining the flexibility of liquid deposition techniques.
Solution Approach 2:
The hole-transporting material layer acts as an intermediary between the irregular anode surface and the organic active layers. This intermediate layer provides a uniform interface that enables uniform deposition of subsequent layers while preserving the manufacturing flexibility of liquid deposition methods.
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 enhances the uniformity of organic layers, prevents current shunting, and improves the fill factor and layer thickness, resulting in a more efficient and reliable OLED display.
Implementation Method 1
treating the anode with an oxygen plasma with a sufficient power density and for a sufficient time to form a non-conductive, hole-transport surface layer on the anode
Data Source
AI summary
There is provided an anode for an organic electronic device. The anode is a conducting inorganic material having an oxidized surface layer. The surface layer is non-conductive and hole-transporting.