Zigzag Electrode Touch Panel Sensing Structure
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Solution Overview
Problem
Single-layer capacitive touch sensors have limited sensitivity due to the arrangement and number of electrodes, which restricts their ability to accurately detect multiple touch points and occupy excessive area with wire layouts.
Innovation Solution
The capacitive touch panel design includes multiple electrodes in each group, with zigzag sub-electrodes and reduced wire widths, allowing for increased sensitivity and accuracy in touch sensing and multi-touch capabilities while minimizing the area occupied by wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple electrodes are disposed in each electrode group to enhance sensitivity, then touch sensing accuracy is improved, but the area occupied by wires increases
Solution Approach 1:
The patent transitions from planar wire layouts to three-dimensional zigzag electrode configurations. The electrodes extend in zigzag patterns across the substrate, utilizing vertical and diagonal dimensions rather than simple horizontal/vertical connections. This dimensional transformation allows multiple electrodes to be interconnected with reduced wire area occupation while maintaining electrical connectivity and touch sensing accuracy.
Solution Approach 2:
The zigzag electrode design nests multiple electrode connections within a compact spatial footprint. By folding the electrode paths back and forth in zigzag patterns, the patent effectively packs more electrode connections into the same area, reducing the overall wire area required while supporting multiple touch points and enhancing sensing accuracy.
2Adaptability or versatility
If the number of electrodes in each electrode group is increased to enhance sensitivity, then multi-touch detection capability is improved, but the device complexity increases
Solution Approach 1:
The patent divides the touch sensing surface into multiple electrode groups, with each group containing multiple discrete electrodes arranged in zigzag patterns. This segmentation allows independent detection of multiple touch points across different electrode groups, enhancing multi-touch capability while maintaining manageable complexity through modular organization of electrodes and their associated wiring.
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 enhances the sensitivity and accuracy of touch sensing by increasing the number of electrodes and touch operation regions, enabling more precise multi-touch detection without increasing the overall area required.
Implementation Method 1
When a user touches the panel using his finger, the proximity of the finger changes the coupling capacitor of the sensing structure. Then the capacitive touch panel can determine the touched location by the finger according to the analysis of the capacitance variation in the sensing structure.
Data Source
AI summary
The present invention relates to a sensing structure of touch panel, which comprises a plurality of electrode groups disposed on a substrate. The substrate has a first side and a second side. Each electrode group comprises a first external electrode, a second external electrode, a plurality of internal electrodes, and a plurality of wires. The first external electrode is disposed on a first side; the second external electrode is disposed on the second side; the plurality of internal electrodes are disposed between the first external electrode and the second external electrode; and the plurality of wires are disposed on both sides of the electrode group alternately. Thereby, by disposing the first external electrode, the second external electrode, and the internal electrodes, all being zigzag, the disposable number of electrodes in each electrode group is increased. Accordingly, the sensitivity of touch sensing for the sensing structure of touch panel is enhanced.