OLED Secondary Electrode Structure for Short-Circuit Protection
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Solution Overview
Problem
Existing OLED devices face issues with short circuits due to defects like dust particles, burrs, and pinholes, leading to reduced reliability and efficiency, especially in large light-emitting areas, and current protection mechanisms are inadequate for varying lighting requirements and edge or non-light-emitting region short circuits.
Innovation Solution
The design incorporates a secondary electrode structure with dielectric material layers and sub-electrodes that cover the light-emitting region, providing comprehensive short circuit protection without pixelation, using thin metal or metal oxide conductors and reflective outer layer electrodes to enhance conductivity and light emission uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the organic layer thickness is increased to reduce short circuit points, then the reliability is improved, but the drive voltage increases and device efficiency decreases
Solution Approach 1:
The patent introduces a vertical dimension solution by adding a secondary electrode structure between the anode and cathode. This structure includes a sub-electrode and dielectric material layer arranged in layers, creating additional spatial dimensions for current distribution. The secondary electrode structure provides alternative current pathways without increasing the horizontal organic layer thickness, thus preventing short circuits while maintaining device efficiency.
2Reliability
If a short circuit prevention portion with high resistance is added to prevent short circuits, then the reliability is improved, but the photovoltaic performance decreases due to large failure current
Solution Approach 1:
The patent introduces a secondary electrode structure as an intermediary element between the anode and cathode. This structure includes a sub-electrode and dielectric material layer that act as a mediator to distribute and regulate current flow. The intermediary structure provides controlled impedance rather than high resistance, allowing it to prevent short circuits while minimizing impact on photovoltaic performance by smoothly managing current distribution.
3Area of stationary object
If the light-emitting area is increased, then the lighting performance is improved, but the likelihood of short circuit points increases
Solution Approach 1:
The patent segments the electrode structure by introducing a secondary electrode structure with sub-electrode and dielectric material layer. This segmentation divides the current pathway into multiple controlled sections, allowing each segment to be optimized independently. The segmented structure enables larger light-emitting areas while maintaining reliability by creating multiple distributed current pathways that reduce the probability of short circuits across the expanded area.
4Reliability
If a secondary electrode structure with sub-electrode and dielectric material layer is added, then the short circuit prevention is improved, but the device complexity increases
Solution Approach 1:
The secondary electrode structure is designed with multi-functionality to justify its addition. The sub-electrode and dielectric material layer serve multiple functions: preventing short circuits, distributing current uniformly, providing mechanical support, and maintaining electrical insulation. By consolidating multiple functions into a single integrated structure, the patent minimizes the increase in device complexity while achieving comprehensive short circuit prevention.
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 significantly improves the stability and yield of OLED devices by preventing short circuits, maintaining light emission, and reducing manufacturing complexity, with optimized sub-electrode thickness and dielectric material properties enhancing device efficiency and longevity.
Implementation Method 1
a first secondary electrode structure is disposed between the substrate and the light-emitting component and includes a first sub-electrode and a first dielectric material layer
Implementation Method 2
using thin metal or metal oxide conductors and reflective outer layer electrodes to enhance conductivity
Implementation Method 3
reflective outer layer electrodes to enhance conductivity and light emission uniformity
Data Source
AI summary
An organic electroluminescent device includes, from bottom to top, a substrate, a first electrode and a light-emitting component in sequence, where the light-emitting component is disposed on the first electrode, and a secondary electrode structure is disposed on an upper side surface of the light-emitting component and includes a sub-electrode, a dielectric material layer and an outer layer electrode, where the dielectric material layer is disposed between the sub-electrode and the outer layer electrode, the sub-electrode is in contact with the light-emitting component, the dielectric material layer and the sub-electrode completely cover a light-emitting region of the light-emitting component, the outer layer electrode completely covers the dielectric material layer, and in a non-light-emitting region on the periphery of the light-emitting component, the outer layer electrode is electrically connected to the sub-electrode.