Capacitive Touch Panel Circuit Structure for Low-Impedance Signals
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Solution Overview
Problem
Conventional capacitive touch panels suffer from high impedance in their circuit structures, leading to signal delay and inaccurate determination of touch location, which decreases the reliability of the touch panel.
Innovation Solution
The circuit structure is modified by dividing it into several electrically isolated electrode sensing blocks connected in parallel with low impedance metal leads to reduce signal transmitting impedance and enhance signal accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional circuit structure with ITO or ATO coating is used, then the touch panel can detect touch input, but the high impedance weakens the touch signal and reduces measurement precision
Solution Approach 1:
The sensing electrode is divided into multiple electrode sensing blocks that are electrically isolated from each other. Each block is connected to the same metal lead, creating multiple parallel signal paths that reduce overall impedance and improve signal transmission reliability while maintaining touch location detection accuracy.
Solution Approach 2:
The patent changes the electrical parameters of the circuit structure by introducing low impedance metal leads and configuring multiple electrode sensing blocks in parallel. This parameter change reduces the overall impedance of the sensing circuit, thereby strengthening the touch signal and improving both measurement precision and reliability.
2Measurement precision
If the circuit structure impedance is high, then the conventional coating structure is simple, but signal delay increases and touch location determination becomes inaccurate
Solution Approach 1:
Dividing the sensing electrode into multiple electrically isolated electrode sensing blocks creates multiple concurrent signal transmission paths. This segmentation reduces signal delay by distributing the electrical load and providing parallel conduction channels, thereby improving both response speed and location accuracy.
Solution Approach 2:
Multiple electrode sensing blocks are merged through connection to the same metal lead, creating a combined low-impedance signal path. This merging of multiple parallel paths reduces overall impedance and signal transmission delay while maintaining accurate touch location determination.
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 improves the efficiency of capacitive sensing signals, allowing for more accurate determination of touch location and increasing the reliability of the capacitive touch panel.
Implementation Method 1
a plurality of electrode sensing blocks. The electrode sensing blocks are electrically isolated to each other respectively and electrically connected to the metal leads, and output a capacitive signal in accordance with at least one touch position
Data Source
AI summary
A circuit structure for capacitive touch panel is disclosed herein. The circuit structure 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 structure can be decreased and the efficiency of the signal transmission can be improved and the sensibility of the touch panel can be increased.