Touch Electrode Phase Alternation for Stylus Noise Filtering
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Solution Overview
Problem
Touch detection performance is degraded by noise in a frequency bandwidth similar to the resonance frequency of a stylus pen, leading to reduced precision in stylus pen interactions.
Innovation Solution
A touch device and method that apply driving signals with different phases to touch electrodes, including a first and second driving signal, to improve detection accuracy by filtering noise and enhancing signal amplitude calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If driving signals with the same phase are applied to touch electrodes, then the touch detection process is simple, but noise interference degrades detection precision
Solution Approach 1:
The patent applies periodic driving signals with different phases (first phase and second phase) alternately to the touch electrodes. By periodically switching between different phase signals and processing the detection results accordingly, the system distinguishes touch signals from noise through phase-dependent signal characteristics, thereby improving detection precision without excessive complexity
Solution Approach 2:
The patent changes the phase parameter of the driving signal applied to touch electrodes. By varying the phase of driving signals between first and second phases, the system creates distinguishable detection patterns that enable noise filtering and improved touch detection precision through parameter-based signal differentiation
2Reliability
If multiple driving signals with different phases are applied alternately, then noise interference is reduced, but the detection process becomes more complex
Solution Approach 1:
The system employs periodic alternation between first and second driving signals with different phases. This periodic structure creates predictable detection patterns that can be processed systematically, improving reliability through consistent signal-noise differentiation while managing complexity through regular cyclic operation
Solution Approach 2:
The patent incorporates feedback mechanisms where detection signals from multiple phases are processed and combined to generate final touch detection results. The controller uses feedback from phase-dependent detection signals to distinguish genuine touch events from noise, thereby improving reliability through feedback-based signal validation
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 solution effectively improves touch detection performance by reducing noise interference and enhancing the accuracy of stylus pen interactions, even in environments with noise in the same frequency bandwidth as the stylus pen's resonance.
Implementation Method 1
driving signals, each having a frequency corresponding to a resonance frequency of a stylus pen
Data Source
AI summary
a touch device according to an exemplary embodiment includes: a plurality of touch electrodes; and a driver/receiver that applies driving signals, each having a frequency corresponding to a resonance frequency of a stylus pen, to the plurality of touch electrodes, and receives detection signals from the plurality of touch electrodes, wherein the driving signals may include a first driving signal and a second driving signal, each having a different phase.