Shielded Touch Panel Layout for Warpage and Interference Balance
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Solution Overview
Problem
Conventional touch panels face issues with warpage due to imbalanced metal content on opposite sides of the board, leading to interference problems.
Innovation Solution
A touch panel design featuring a carrier with first and second metal structures, including sensing and driving electrode layers, shielding layers, and conductive pillars, with controlled distribution areas and holes to balance metal content and improve anti-interference properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the covering density of the shielding layer is increased to improve anti-interference property, then the anti-interference property is improved, but the metal content balance between two opposite sides of the board deteriorates, causing warpage issue
Solution Approach 1:
The patent applies local quality by creating different metal distribution patterns on opposite sides of the board. The first metal structure on the first surface and the second metal structure on the second surface are designed with different geometries and distributions, allowing each side to have optimized local metal content that collectively balances the overall structure while maintaining high anti-interference performance through the shielding layers.
Solution Approach 2:
The patent employs asymmetry by designing the first metal structure and second metal structure with different configurations. The first metal structure includes a sensing electrode layer and driving electrode layer with specific patterns, while the second metal structure includes shielding layers with different geometries. This asymmetric design allows balancing metal content on opposite sides while maintaining effective shielding and preventing warpage.
2Object-affected harmful factors
If the covering density of the shielding layer is increased to improve anti-interference property, then the anti-interference property is improved, but warpage issue occurs due to imbalanced metal content
Solution Approach 1:
The patent uses local quality by designing specific metal distribution patterns in different regions of the board. The first metal structure and second metal structure are configured with different geometries and densities in specific local areas, allowing the shielding effectiveness to be optimized locally while the overall metal balance prevents warpage deformation of the board shape.
Solution Approach 2:
The patent applies the counterweight principle by designing the second metal structure on the second surface to compensate for the metal distribution of the first metal structure on the first surface. The shielding layers and conductive pillars are strategically positioned and sized to create a counterbalancing effect, offsetting potential warpage forces while maintaining high anti-interference properties through effective shielding.
3Stability of the object's composition
If distribution holes are formed in the second shielding layer to control metal distribution, then metal content balance is improved, but the structure complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the second shielding layer into multiple regions with distribution holes at specific positions. Instead of creating a complex overall structure, the shielding layer is segmented into functional zones - areas with holes for metal balance and areas without holes for continuous shielding. This segmented approach simplifies the manufacturing process while achieving both metal content balance and effective anti-interference performance.
Data Source
AI summary
A touch panel includes a carrier, a first metal structure, and a second metal structure, the latter two of which are respectively disposed on two opposite sides of the carrier. The first metal structure includes a sensing electrode layer and a driving electrode layer that is spaced apart from the sensing electrode layer. The second metal structure includes a first shielding layer and a second shielding layer. A first projection region defined by orthogonally projecting the first shielding layer onto the first metal structure is overlapped with M % of area of the sensing electrode layer. The second shielding layer has a plurality of distribution holes. A second projection region defined by orthogonally projecting the second shielding layer onto the first metal structure is overlapped with N % of area of the driving electrode layer, and M and N are positive numbers and different from each other.