Cathode Oxide Layer Reduces Leakage Current in Display Devices
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Solution Overview
Problem
Current display devices face issues with current leakage and high resistance due to conductive particles present in the cathode electrode, which are difficult to identify and prevent during manufacturing.
Innovation Solution
A method involving a controlled oxidation process to form an oxide layer on the interface between conductive particles and the metal layer, reducing leakage current and minimizing resistance by electrically insulating the particles, and a multi-layered metal electrode structure to enhance the cathode's functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal layer is formed to create the cathode electrode, then the cathode electrode provides necessary electrical conductivity, but conductive particles in the metal layer cause current leakage
Solution Approach 1:
The patent applies a controlled oxidation process to convert the harmful conductive particles into beneficial oxide particles with insulating properties. By exposing the metal layer to oxygen plasma or chemical oxidants, the conductive metal particles are transformed into non-conductive oxide particles, thereby eliminating the current leakage problem while maintaining the overall cathode electrode functionality.
Solution Approach 2:
The patent changes the physical and chemical parameters of the conductive particles through oxidation. The metal particles undergo a phase and property transformation from conductive state to insulative oxide state, fundamentally altering their electrical properties to prevent current leakage while preserving the cathode's electron injection capability.
2Ease of manufacture
If the cathode electrode structure is simplified for ease of manufacture, then manufacturing cost is reduced, but resistance of the cathode electrode increases
Solution Approach 1:
The oxidation process is performed as a preliminary treatment step before final cathode electrode assembly. By pre-oxidizing the metal layer to form an insulating barrier on conductive particles, the patent prevents subsequent current leakage issues without requiring complex post-manufacturing adjustments or additional structural components.
Solution Approach 2:
The patent replaces mechanical or physical mixing methods with a chemical oxidation process to achieve particle insulation. Instead of mechanically separating or coating particles, the chemical oxidation method uniformly transforms particle properties throughout the metal layer, providing consistent resistance reduction across the entire cathode electrode.
3Ease of manufacture
If conductive particles are present in the cathode electrode, then the electrode can be formed with standard materials, but these particles create leakage current paths
Solution Approach 1:
The patent transforms the harmful conductive particles into beneficial insulating oxide particles through controlled oxidation. This conversion maintains the simplicity of using standard metal materials while eliminating the leakage current problem by fundamentally changing the electrical properties of the particles through chemical oxidation.
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
Significantly reduces leakage current and lowers the resistance of the cathode electrode while maintaining its functional integrity, ensuring effective operation of the display device.
Implementation Method 1
A method involving a controlled oxidation process to form an oxide layer on the interface between conductive particles and the metal layer
Data Source
AI summary
An electroluminescent device may be provided that includes a substrate, a first electrode provided on the substrate, a light emitting layer provided on the first electrode, and a first metal layer provided on the light emitting layer. An oxide layer may also be provided at an interface of the first metal layer and a conductive particle. Other embodiments as described herein may also be provided.