Thin Metal Wire Lattice Electrode Layout for Transparent Touch Panels
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Solution Overview
Problem
Conventional touch panels with ITO electrodes exhibit high resistance, leading to low current transfer rates and slow response speeds, especially in larger devices, and thin metal wire electrodes are opaque, affecting transparency and visibility.
Innovation Solution
A conductive sheet with alternating layers of thin metal wire lattices on both surfaces of a substrate, where the lattices are arranged in a specific pattern to reduce resistance and improve visibility, allowing for efficient current transfer and visibility in projected capacitive touch panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO (indium tin oxide) is used as an electrode material, then the electrode can be formed, but the resistance is high leading to low current transfer rate and slow response speed
Solution Approach 1:
The patent changes the material parameter from ITO to thin metal wires, which fundamentally alters the electrical resistance characteristic. This material substitution enables significantly lower resistance and higher current transfer rates, directly resolving the contradiction between response speed and current transfer efficiency
Solution Approach 2:
The patent employs a composite structure combining transparent substrate with thin metal wire lattices. This composite approach maintains the transparency needed for display applications while introducing metal's superior electrical conductivity, simultaneously achieving both optical and electrical performance requirements
2Loss of energy
If thin metal wires are used to form an electrode with lowered surface resistance, then the resistance is reduced, but the electrode becomes opaque affecting transparency and visibility
Solution Approach 1:
The patent segments the continuous metal electrode into discrete thin metal wire lattices. This segmentation creates gaps between the wires that allow light transmission, maintaining transparency while the metal wires themselves provide the low resistance pathway for current flow, thus resolving the contradiction between electrical performance and optical transparency
Solution Approach 2:
The patent applies different properties to different parts of the electrode structure: the thin metal wires provide high conductivity while the spaces between wires maintain transparency. This local differentiation of functional properties allows simultaneous achievement of low resistance and high visibility
Data Source
AI summary
A conductive component including two or more conductive first and second large lattices composed of a thin metal wire, wherein the first and second large lattices each contain a combination of two or more small lattices, a first unconnected pattern composed of a thin metal wire separated from the first and second large lattices is formed around a side of the first large lattices, a second unconnected pattern composed of a thin metal wire separated from the first and second large lattices is formed around a side of the second large lattices, the first large lattices are arranged adjacent to the second large lattices as viewed from above, the first and second unconnected patterns overlap with each other to form a combined pattern between the first and second large lattices as viewed from above, and the combined pattern contains a combination of two or more of the small lattices.