Elastic Contact Electrode for OLED Display Fabrication
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Solution Overview
Problem
The existing organic electroluminescence display devices face a contacting defect issue between the light emission array and the TFT array due to weak adhesion between metal contact electrodes, leading to incomplete signal transmission and fabrication challenges.
Innovation Solution
The use of a conductive polymer material for the contact electrode, which allows for complete contact with the light emission array electrodes by pressing, eliminating the need for a mask process and simplifying the fabrication method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal contact electrodes are used to connect light emission array and TFT array, then electrical connection is established, but adhesion is weak leading to contact defects
Solution Approach 1:
The patent uses a composite structure consisting of an elastic layer (first material) and a conductive layer (second material) where the second material has different elastic modulus than the first material. This composite structure combines the adhesion benefits of the elastic layer with the electrical conductivity of the conductive layer, resolving the contradiction between contact reliability and adhesion strength.
Solution Approach 2:
The patent changes the physical parameters of the contact electrode by using materials with different elastic moduli. The elastic layer provides compliance and adhesion, while the conductive layer provides electrical connectivity. This parameter differentiation allows the structure to simultaneously achieve strong adhesion and reliable electrical contact.
2Manufacturing precision
If mask process is used for forming contact electrodes, then precise positioning is achieved, but fabrication complexity increases
Solution Approach 1:
The elastic contact electrode structure enables self-alignment and self-adjustment during the bonding process. The elasticity of the first material allows the contact electrode to conform to the underlying structures without requiring precise mask alignment, thereby achieving positioning accuracy while simplifying the fabrication process.
Solution Approach 2:
The patent employs a flexible elastic layer that can deform and conform to the underlying substrate and electrode structures. This flexibility eliminates the need for rigid mask alignment processes while maintaining precise contact positioning through elastic deformation and self-adjustment.
3Stability of the object's composition
If rigid contact electrodes are used, then structural stability is maintained, but contact completeness deteriorates due to inability to conform to surface variations
Solution Approach 1:
The patent introduces dynamic flexibility through the elastic layer that allows the contact electrode to adapt its shape during bonding. The elastic material can deform to conform to surface variations while maintaining structural integrity, achieving both contact completeness and structural stability through controlled elastic deformation.
Solution Approach 2:
The elastic layer acts as a flexible component that can deform and conform to the underlying substrate topography. This flexibility ensures complete contact area coverage while the overall structure maintains stability through the bonded configuration and material properties.
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 solution ensures reliable electrical connection between the light emission and TFT arrays, reduces the risk of contact defects, and lowers fabrication costs by using a more flexible and ductile material, improving contact area and reducing wire breakage.
Implementation Method 1
The contact electrode formed of a conductive polymer material has elasticity and ductility, thereby completely contacting the electrodes of the light emission array by pressing
Data Source
AI summary
An organic electro-luminescence display device includes at least one light emission device, the organic light emission device having a first electrode; at least one thin film transistor for driving the light emission device, a pixel electrode being connected to the at least one thin film transistor; a conductive layer formed of a conductive polymer material to electrically connect the light emission device and the pixel electrode.