Multilayer Electrode Contact Button Area Expansion
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Solution Overview
Problem
In liquid crystal display units, the multilayer panel electrode structure experiences high contact resistance due to a smaller contact area between the aluminum and ITO conductor layers, which can adversely affect electrical signal transmission, particularly at the input terminal.
Innovation Solution
The electrode structure is enhanced by creating a multilayer contact button portion with an enlarged area, where the second conductor layer of ITO is stacked over the first conductor layer of aluminum, increasing the contact area to reduce resistance and protect against corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multilayer structure of ITO stacked on aluminum conductor layer is formed to protect from corrosion, then reliability is improved, but contact resistance increases due to smaller contact area
Solution Approach 1:
The patent applies dimensionality change by enlarging the contact button portion area in the planar dimension (X-Y plane) rather than increasing thickness. This allows the multilayer conductor structure to maintain both corrosion protection and low contact resistance by expanding the contact footprint area, thereby reducing contact resistance while preserving the protective multilayer configuration.
2Reliability
If the contact button portion area is enlarged to reduce contact resistance, then electrical connection reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by selectively enlarging only the contact button portion area where electrical connection occurs, while keeping other areas of the panel electrode at their original dimensions. This localized enlargement reduces contact resistance at critical connection points without unnecessarily increasing the overall device complexity or area.
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 configuration significantly reduces contact resistance and enhances the reliability of electrical connections, preventing corrosion and ensuring stable signal transmission in liquid crystal display units.
Implementation Method 1
a conductor layer of ITO is stacked on a conductor layer of aluminum to protect the conductor layer of metal, thereby expecting suppression of corrosion occurrence etc.
Implementation Method 2
contact resistance will occur in a portion of contact between the conductor layer of aluminum and the conductor layer of ITO. The contact resistance is in inverse proportion to the area of contact between the conductor layer of aluminum and the conductor layer of ITO.
Data Source
AI summary
An electrode structure includes at least a contact button portion that has a portion of multilayer structure of two or more conductor layers stacked and enlarged in area. A part mounting structure includes a substrate, a contact button portion which is formed on the substrate and on which a part is mounted by connection via a bump, wherein at least the contact button portion has a portion of multilayer structure of two or more conductor layers stacked, a part of which is enlarged in area. A liquid crystal display unit is equipped with the part mounting structure.