Annular Node Mesh Touch Panel Reducing Signal Attenuation
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Solution Overview
Problem
Large-size touch panels face issues with high surface resistance at nodes in mesh structures, leading to signal attenuation and restricted line width design, which affects touch sensitivity and response speed.
Innovation Solution
A touch panel with a mesh structure featuring annular-shaped nodes and center holes, allowing reduced surface resistance and enabling narrower conductive wire widths without disconnection risks, thereby improving signal transmission and light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mesh structure uses conventional nodes formed by intersecting conductive wires, then the structure is simple and easy to manufacture, but the surface resistance at nodes is large causing signal attenuation
Solution Approach 1:
The node is segmented into an annular shape with a center hole, separating the conductive path into outer ring and inner hole regions. This segmentation reduces the effective resistance area while maintaining structural integrity, lowering surface resistance at the node without complicating the manufacturing process
Solution Approach 2:
The node design transitions from a simple point intersection to a two-dimensional annular structure with a center hole. This dimensional change increases the effective conductive area and reduces current density, thereby reducing surface resistance and improving signal transmission quality
2Illumination intensity
If the conductive wire line width is reduced to improve light transmission, then light transmission improves, but the line width cannot be designed too small due to node resistance constraints
Solution Approach 1:
The annular node design applies local quality changes by creating a concentrated conductive path in the outer ring while leaving the center hole open. This allows the conductive wires to have narrower line widths in the active region for better light transmission, while the annular node structure provides sufficient electrical connection reliability
Solution Approach 2:
The annular node acts as an intermediary structure between the conductive wires, providing a low-resistance connection point that decouples the line width design from the node resistance constraint. This intermediary allows narrower wire widths to be used without compromising signal transmission stability
3Reliability
If ITO material is used for electrodes in large-size touch panels, then the material is transparent and conductive, but the resistance value is relatively large not suitable for large-size panels
Solution Approach 1:
The patent employs a composite mesh structure combining annular nodes with conductive wires, creating a distributed conductive network that reduces overall resistance. This composite approach allows the use of standard transparent conductive materials while achieving the low resistance values required for large-size panels through the mesh architecture itself
Data Source
AI summary
A touch panel includes a transparent substrate and a sensing pattern formed on the transparent substrate. The sensing pattern is in the form of a mesh structure. The mesh structure includes a plurality of conductive wires intersecting with each other to form a plurality of grids and a plurality of nodes connected between the grids. The grids are formed by the conductive wires intersecting with each other, and the nodes are formed at the intersection points of the conductive wires. The node has an annular shape with a center hole being defined in a center portion of the node. Due to the nodes having an annular shape, the surface resistance at the nodes is decreased and the signal attenuation is accordingly reduced. The conductive wires are connected firmly without the risk of breakage after the sensing pattern is formed.