OLED Electrode Segmentation for Leakage Current Control
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Solution Overview
Problem
Organic light emitting devices (OLEDs) face functional loss and increased leakage current due to short defects, which can lead to dead pixels and reduced light emission, and existing methods to mitigate these issues are costly and incomplete.
Innovation Solution
The OLED design incorporates a substrate with a first electrode featuring separated conductive units and a conductive connection with high resistance regions, allowing current to flow through auxiliary electrodes, thereby preventing excessive current leakage and maintaining functionality even with short defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the organic layer is increased to decrease short defects, then the reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The first electrode is divided into multiple conductive units that are separated from each other, with each unit independently connected to the auxiliary electrode through high resistance regions. This segmentation allows current to be distributed across multiple paths, reducing the impact of short defects in any single region and maintaining device reliability without increasing organic layer thickness.
Solution Approach 2:
High resistance regions are introduced as intermediary elements between the conductive units and the auxiliary electrode. These high resistance regions act as current regulators that prevent excessive current flow in case of short defects, thereby improving reliability without requiring increased organic layer thickness.
2Reliability
If the organic layer thickness is increased to prevent short defects, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The first electrode is segmented into multiple conductive units with separate connections to the auxiliary electrode. This segmentation creates multiple independent current paths, improving reliability against short defects while maintaining a relatively simple overall device structure without requiring increased organic layer thickness.
3Device complexity
If conventional electrode structure is used, then the device complexity is reduced, but leakage current increases when short defects occur
Solution Approach 1:
The first electrode is divided into multiple conductive units that are separated and independently connected to the auxiliary electrode through high resistance regions. This segmentation limits leakage current by distributing current across multiple high-resistance paths, preventing excessive current concentration even when short defects occur, while maintaining relatively simple device complexity.
Solution Approach 2:
The resistance parameter of the connection regions between conductive units and auxiliary electrode is changed to high resistance. This parameter change effectively limits leakage current flow while maintaining a simple electrode structure without requiring complex additional components.
4Manufacturing precision
If uniform electrode structure is used, then the manufacturing precision is improved, but current distribution becomes uneven when short defects occur
Solution Approach 1:
The first electrode is segmented into multiple conductive units with separate connections to the auxiliary electrode through high resistance regions. This segmentation ensures that even with uniform manufacturing, current distribution remains stable by providing multiple independent paths, preventing current concentration in case of short defects in any single region.
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 design ensures stable operation of OLEDs without increased leakage current, even when short circuits occur, by controlling current flow through high resistance regions, thus preventing device failure and maintaining light emission.
Implementation Method 1
the conductive connection includes one or more high resistance regions
Data Source
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AI summary
The present specification relates to an organic light emitting device and a method for manufacturing the same.