Capacitive Touch Panel Circuit Segmentation for Impedance Reduction
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Solution Overview
Problem
Conventional capacitive touch panels have high impedance circuit patterns that weaken touch signals, leading to inaccurate determination of touch location and decreased reliability.
Innovation Solution
The circuit pattern is modified by dividing it into several electrode sensing blocks with low impedance metal leads connected in parallel, reducing signal transmission impedance and enhancing signal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional circuit pattern with continuous ITO or ATO coating is used, then the touch panel can detect touch input, but the impedance is large which weakens the touch signal and reduces reliability
Solution Approach 1:
The continuous circuit pattern is divided into multiple discrete electrode sensing blocks arranged in series. Each block is separated by non-conductive regions, creating a segmented structure that reduces overall impedance while maintaining touch detection capability across the panel surface.
Solution Approach 2:
Multiple electrode sensing blocks are electrically connected in parallel through conductive leads to create an equivalent circuit with reduced impedance. The parallel configuration combines the conductive paths of individual blocks, lowering the total impedance presented to the touch signal.
2Measurement precision
If a continuous circuit pattern is used, then the manufacturing process is simple, but the signal transmission accuracy is reduced due to high impedance
Solution Approach 1:
The circuit pattern is segmented into multiple electrode sensing blocks with defined conductive and non-conductive regions. This segmentation improves touch location accuracy by creating distinct sensing zones while the systematic arrangement maintains manufacturing feasibility.
Solution Approach 2:
The electrical parameters of the circuit pattern are modified by changing from a continuous high-impedance structure to a segmented parallel configuration. This parameter change reduces impedance and improves signal transmission accuracy without requiring fundamentally new manufacturing processes.
3Productivity
If the circuit pattern impedance is high, then the material coating can be continuous and simple, but the touch signal is weakened and transmission efficiency is reduced
Solution Approach 1:
Multiple electrode sensing blocks are merged into a parallel electrical configuration, combining their conductive pathways. This merging effect reduces the equivalent impedance and increases signal transmission efficiency while maintaining the segmented physical structure for accurate touch detection.
Solution Approach 2:
The continuous conductive layer is segmented into discrete electrode blocks that are electrically paralleled. This segmentation combined with parallel connection reduces the overall impedance presented to the touch signal, improving transmission efficiency without sacrificing detection accuracy.
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 design improves the accuracy and reliability of touch signal transmission by reducing impedance, allowing for precise determination of touch location and increased efficiency of capacitive sensing signals.
Implementation Method 1
The electrode sensing block and the low impedance metal lead are stacked together and electrically connected in parallel, utilizing the electrical conduction property to reduce signal transmission impedance
Implementation Method 2
When the human finger touches on the capacitive touch panel, the human finger will absorb a little current from the touch panel and the touch panel will calculate the percentage of the absorbed current to find the X-axis Y-axis coordinate of the touch location
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A circuit pattern for capacitive touch panel is disclosed herein. The circuit pattern for capacitive touch panel includes a plurality of metal leads and a plurality of electrode sensing blocks. Those electrode sensing blocks are isolated to each other and electrically connected to the metal leads. The electrode sensing blocks will output a plurality of capacitive signals in accordance with a plurality of touch positions. According to the electrode pattern structure described above, the impedance of the electrode pattern can be decreased and the efficiency of the signal transmission can be improved and the sensibility of the touch panel can be increased.