Touch Screen Panel Ground Line Shielding Trace Coupling
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Solution Overview
Problem
Touch screen panels experience signal noise and reduced accuracy in detecting touch positions due to coupling phenomena between trace lines, which degrades the performance of capacitance-type touch screen panels.
Innovation Solution
Incorporating a ground line between the first and second trace lines, which are connected to sensing electrodes, to reduce coupling by providing a common ground power supply and using step parts in trace lines and ground lines to enhance electrical shielding and spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If trace lines are arranged close together to reduce device complexity, then manufacturing simplicity is improved, but coupling phenomena occur causing signal noise and reduced measurement precision
Solution Approach 1:
A ground line is introduced as an intermediary element between the first and second trace lines. This ground line acts as a shielding mediator that blocks electromagnetic coupling between the adjacent trace lines, thereby reducing signal noise while allowing the trace lines to remain in close proximity for simplified device structure.
2Measurement precision
If ground line is added between trace lines to reduce coupling, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The ground line is merged with the existing trace line structure rather than being implemented as a completely separate component. The ground line shares the same layer and material properties as the trace lines, and its positioning is integrated into the overall circuit design, thereby minimizing the increase in device complexity while achieving effective coupling reduction.
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
The implementation of a ground line and strategic design features in trace lines effectively reduces signal noise, improving the accuracy of touch position detection and maintaining the structural integrity of the touch screen panel.
Implementation Method 1
Incorporating a ground line between the first and second trace lines, which are connected to sensing electrodes, to reduce coupling by providing a common ground power supply and using step parts in trace lines and ground lines to enhance electrical shielding and spacing.
Data Source
AI summary
An embodiment is directed to a touch screen panel including first sensing electrodes, second sensing electrodes, and a pad unit to be electrically connected to the first sensing electrodes and the second sensing electrodes, the touch screen panel including first trace lines connecting the first sensing electrodes and the pad unit, second trace lines connecting the second sensing electrodes and the pad unit, and a ground line connected to a ground power supply, the ground line being between the first trace lines and the second trace lines.