Capacitive Stylus Electrode Layout to Reduce Signal Coupling
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Solution Overview
Problem
Coupling between electrodes in capacitive styluses affects writing accuracy and performance, leading to reduced precision and reliability in touchscreen interactions.
Innovation Solution
The stylus design includes a first electrode in the stylus tip and a second electrode on the inner wall of the stylus rod or a fastener, increasing the distance between them to minimize coupling and enhance signal accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two transmitting electrodes are disposed in the stylus tip, then the stylus can detect location and inclination angle, but coupling occurs between the electrodes which reduces writing accuracy
Solution Approach 1:
The patent divides the electrode system into two separate transmitting electrodes (first and second transmitting electrodes) positioned at different locations within the stylus. This segmentation allows independent detection functions while reducing mutual coupling effects, as each electrode can be optimized for specific detection purposes without direct interference from the other.
Solution Approach 2:
The patent positions the two transmitting electrodes at different spatial locations within the stylus structure - one in the stylus tip and another in the stylus rod. This spatial dimensionality separation reduces electromagnetic coupling between electrodes while maintaining detection capabilities for both location and inclination angle through differential measurement.
2Volume of moving object
If the second electrode is disposed close to the first electrode in the stylus tip, then the structure is compact, but coupling between electrodes increases reducing signal accuracy
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional spatial distribution of electrodes. By positioning electrodes at different axial locations (tip vs. rod) and radial positions, the design achieves both compact overall dimensions and sufficient inter-electrode spacing to minimize coupling while maintaining signal accuracy.
Data Source
AI summary
A stylus and an electronic device component are disclosed. The stylus includes a stylus rod and a detachable stylus tip at one end of the stylus rod, and further includes a first electrode, a second electrode, and a circuit board. The first electrode is disposed in the stylus tip. The second electrode is disposed on an inner wall of the stylus rod, or the second electrode is disposed on a fastener in the stylus rod, and the second electrode is electrically connected to the second circuit board. This increases a distance between the first electrode and the second electrode, and reduces coupling between the first electrode and the second electrode. The stylus in embodiments of this application resolves a problem that writing accuracy of the stylus is reduced because the two electrodes in the stylus are easily coupled.