Touch Panel Electrostatic Capacity Balance
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Solution Overview
Problem
Conventional projected capacitive touch panels with a two-layer structure suffer from low detection sensitivity due to large electrostatic capacity differences between X and Y electrodes, leading to suboptimal performance in detecting touch positions.
Innovation Solution
The touch panel member is designed with a two-layer structure comprising a first and second transparent resin layer and electrode substrates, where the second conductive pattern group is configured to achieve an electrostatic capacity between 80% to 120% of the first electrostatic capacity, ensuring balanced detection sensitivity for both X and Y axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a two-layer structure with X and Y electrodes is used to achieve large-size and high-sensitivity touch panels, then the touch panel can detect two-dimensional coordinates, but the electrostatic capacity difference between X and Y electrodes causes low detection sensitivity
Solution Approach 1:
The patent adjusts the electrostatic capacity parameters of the X and Y electrodes by modifying their respective conductive pattern groups. Specifically, it configures the second conductive pattern group (Y electrode) to have an electrostatic capacity that is 80%-120% of the first conductive pattern group (X electrode), thereby balancing the previously unequal capacities and improving detection sensitivity across both axes.
2Reliability
If see-through electrodes with mesh pattern are used to reduce wiring resistance, then electrical conductivity is improved, but the electrostatic capacity balance between layers deteriorates
Solution Approach 1:
The patent modifies the parameters of the conductive patterns by adjusting the mesh configuration, line width, or spacing of the second conductive pattern group to achieve balanced electrostatic capacities while maintaining the low-wiring-resistance benefit of the mesh structure.
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 enhances the detection sensitivity of the touch panel by maintaining electrostatic capacities in a balanced range, thereby improving the accuracy and reliability of touch position detection.
Implementation Method 1
the second conductive pattern group is configured to cause a second electrostatic capacity between the reference conductor and the second conductive pattern group range from 80% to 120%, inclusive, of a first electrostatic capacity between the reference conductor and the first conductive pattern group
Data Source
AI summary
A touch panel member includes a first transparent resin layer, a first electrode substrate, a second transparent resin layer, and a second electrode substrate, which are disposed in this order. The first electrode substrate includes a first substrate and a first conductive pattern group. The second electrode substrate includes a second substrate and a second conductive pattern group. When a reference conductor is brought into contact with a touch panel cover while the touch panel cover is disposed on the first transparent resin layer at a side opposite to the first electrode substrate, the second conductive pattern group is configured to cause a second electrostatic capacity between the reference conductor and the second conductive pattern group range from 80% to 120%, inclusive, of a first electrostatic capacity between the reference conductor and the first conductive pattern group.