Fuse Pattern for OLED Electrode Current Uniformity
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Solution Overview
Problem
Organic light emitting devices with large areas face issues with non-uniform light emission due to high resistance in electrodes, leading to voltage drops and electrical short circuits, which affect brightness and stability.
Innovation Solution
Incorporating a fuse pattern that electrically connects the first and auxiliary electrodes, allowing automatic cutoff of excessive current and preventing electrical short circuits, thereby ensuring uniform current distribution and maintaining brightness across the emission area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high driving current is used to improve brightness in large area devices, then light emission brightness is improved, but voltage drop increases and current uniformity deteriorates
Solution Approach 1:
The electrode is divided into multiple segments (first electrode, auxiliary electrode, and fuse pattern) to distribute current flow paths. This segmentation reduces voltage drop across the large area and improves current uniformity while maintaining high brightness through increased current injection capability
2Reliability
If electrode resistance is decreased to improve current uniformity, then current distribution is improved, but electrode material selection and structure become more complex
Solution Approach 1:
A fuse pattern acts as an intermediary element connecting the first electrode and auxiliary electrode. This intermediate structure provides additional current pathways and reduces overall electrode resistance, improving current uniformity without requiring complete redesign of the main electrode materials
3Illumination intensity
If thin film electrode is used to maintain transparency, then optical transparency is improved, but electroconductivity decreases
Solution Approach 1:
The electrode system uses a composite structure combining transparent conductive materials (for transparency) with additional conductive layers and fuse patterns (for electroconductivity). This multi-layer composite approach maintains optical transparency while providing sufficient electrical conductivity through the combined effect of multiple materials
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 fuse pattern effectively prevents electrical short circuits and ensures uniform light emission across large areas by automatically cutting off excessive current, enhancing the stability and efficiency of the organic light emitting device.
Implementation Method 1
the fuse pattern which electrically connects the first electrode and the auxiliary electrode to each other
Implementation Method 2
uses a phenomenon where electric energy is converted into light energy by using an organic material, that is, an organic light emission phenomenon
Data Source
AI summary
The present invention relates to an organic light emitting device and a method for preparing the same. An organic light emitting device according to the present invention comprises an organic light emitting unit having a structure in which a substrate, a first electrode, an organic material layer, and a second electrode are sequentially laminated, wherein the organic light emitting device comprises an auxiliary electrode and a fuse pattern; and the first electrode and the auxiliary electrode are electrically connected to each other through the fuse pattern.