Capacitive Stylus Shielding for Tilt Detection
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Solution Overview
Problem
Existing capacitive styluses face interference from other signals or noise waves, leading to unstable signal fluctuations, which complicates the calculation of tilt and orientation by digitizer systems.
Innovation Solution
A capacitive stylus design incorporating a control circuit board, a pin, a signal-transmitting spring, insulating sheets, a shielding layer, and a signal emitter, where the signal-transmitting spring passes through apertures in the insulating and shielding layers to emit a stable high voltage signal, reducing noise interference and enabling precise tilt and orientation detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a capacitive stylus emits multiple signals for tilt and orientation detection, then the digitizer system can calculate tilt and orientation, but the signals are interfered by other signals or noises resulting in signal fluctuation
Solution Approach 1:
The patent introduces a shielding layer as an intermediary component between the signal emitter and the external environment. This shielding layer acts as a mediator that blocks external electromagnetic noises and interference signals from reaching the signal transmission path, thereby stabilizing the high voltage signals emitted by the pin and signal-transmitting spring while maintaining their utility for tilt and orientation detection
Solution Approach 2:
The patent converts the harmful effect of signal interference and noise into a benefit by using the shielding layer to selectively block unwanted signals while allowing the necessary high voltage signals to pass through. The shielding layer transforms the problematic electromagnetic environment into a controlled one where only the desired signals reach the digitizer system, improving both signal stability and detection precision
2Measurement precision
If complex algorithms are used to exclude signal fluctuation, then tilt and orientation can be correctly calculated, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by implementing the shielding layer before the signals are transmitted and potentially corrupted. This preventive measure blocks interference and noise in advance, ensuring that the signals reaching the digitizer system are already stabilized and clean, thereby eliminating the need for complex post-processing algorithms to correct signal fluctuations
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 design stabilizes the high voltage signal emitted by the stylus, allowing for accurate calculation of tilt and orientation by the tablet or touch panel, enhancing the precision and reliability of stylus position tracking.
Implementation Method 1
a shielding layer, and a second insulating sheet... the shielding layer electrically connecting with a ground of the control circuit board
Implementation Method 2
a first insulating sheet covers the signal-transmitting spring... a second insulating sheet covers the shielding layer
Data Source
AI summary
A capacitive stylus capable of providing signals for tilt and orientation detection is provided. The capacitive stylus is used for a tablet or a touch panel. The capacitive stylus can emit two high voltage waves, and the tablet or the touch panel receives the two high voltage waves and determines a tilt angle and an orientation of the capacitive stylus according to the two high voltage waves. This capacitive stylus has configuration allowing the tilt and orientation detection to be precise.