Touch Panel Impedance Equalization for Sensing Accuracy
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Solution Overview
Problem
The varying lengths and impedances of connection wires in traditional capacitive touch panels lead to decreased sensing accuracy of touch positions due to different distances between wires and the controller.
Innovation Solution
Incorporating an impedance adjusting unit with parallel resistor units and controllable switches connected to each connection wire, allowing the controller to adjust and equalize the impedance of each wire, improving sensing precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If every X direction sensing series and Y direction sensing series are directly connected to the controller by corresponding connection wires, then the connection structure is simple, but the impedance of each connection wire becomes diverse due to different distances, decreasing sensing accuracy
Solution Approach 1:
An impedance adjusting unit is introduced as an intermediary component between the touch unit array and the controller. This unit includes multiple parallel resistor units that can be selectively connected to each connection wire through controllable switches, serving as a mediator to equalize the impedance of different connection wires without requiring complex routing or equal-length wire design
2Adaptability or versatility
If the distance between each connection wire and the controller is different due to space position factors, then the layout flexibility is high, but the length and impedance of each connection wire become different, affecting sensing accuracy
Solution Approach 1:
The impedance adjusting unit applies local compensation to each connection wire individually. Each parallel resistor unit can be independently controlled to adjust the impedance of its corresponding connection wire, allowing different parts of the system to have different local characteristics while maintaining overall system performance
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 solution ensures consistent impedance across all connection wires, enhancing the accuracy of touch location sensing in capacitive touch panels.
Implementation Method 1
the impedance adjusting unit comprises; a plurality of paralleled resistor units, wherein, each of connection wires connects to a corresponding parallel resistor unit
Data Source
AI summary
The present invention discloses a touch panel, comprising: a substrate, a touch unit array, a plurality of connection wires, an impedance adjusting unit and controller. The impedance adjusting unit and the controller are arranged on the substrate, the touch unit array connects to the impedance adjusting through the plurality of connection wires, the impedance adjusting unit connects to the controller, the impedance adjusting unit is processing adjustment to impedance of each connection wires to make impedance of each connection wires consistent. The touch panel of the present invention will adjust impedance of each connection wire to be consistent for improving the sensing precision of touch location of touch panel.