Touch System Base Signal Update for Interference Rejection
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Solution Overview
Problem
Conventional touch systems face challenges in distinguishing between intentional touch signals and interference signals caused by wrist, palm, or water stains, leading to misjudged operations and abnormal signal detection during boot-up or when these interferences are present.
Innovation Solution
A detection and updating method for touch systems that involves computing an integrated base signal using ideal and raw signal measurements, with regression analysis to adjust and compensate for noise, thereby reducing the impact of interference and eliminating abnormal operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch panel updates the base signal only when non-active, then power consumption is reduced and system complexity is minimized, but heterogeneous signals from palm or water stains persist for a long time causing abnormal operations to be misjudged
Solution Approach 1:
The patent implements dynamic base signal updating that adapts to system state: during active touch operation, base signal updates are suppressed to maintain stability, while during inactive periods or anomaly detection, updates are enabled to correct heterogeneous signals. This dynamic adjustment resolves the contradiction by making the updating mechanism flexible rather than fixed.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor touch detection results and automatically trigger base signal updates when anomalies are detected. The controller analyzes detection signals to determine whether updates should proceed, creating a closed-loop system that improves reliability without requiring complex manual intervention or continuous updating.
2Measurement precision
If the touch panel continuously updates the base signal to eliminate heterogeneous signals, then touch detection accuracy improves, but system complexity increases and abnormal operations may still be misjudged during boot-up
Solution Approach 1:
The patent performs preliminary base signal measurements and comparisons before final touch detection decisions. By pre-assessing whether detected anomalies represent genuine touch events or heterogeneous signals like palm or water stains, the system can prepare appropriate base signal updates in advance, improving measurement precision while managing complexity through structured preprocessing.
Solution Approach 2:
The signal measurement process is divided into distinct segments: initial base signal acquisition, anomaly detection phase, update decision phase, and execution phase. This segmentation allows each stage to be optimized independently, reducing overall system complexity while maintaining high measurement precision through focused processing at each stage.
3Measurement precision
If the touch panel uses multiple measuring frequencies for base signal measurement, then signal accuracy improves and noise is better filtered, but measurement time and processing complexity increase
Solution Approach 1:
The patent employs periodic measurements at multiple frequencies rather than continuous single-frequency measurement. By alternating between different measuring frequencies in a structured periodic pattern during base signal acquisition, the system achieves superior noise filtering and measurement accuracy while limiting total measurement time through the periodic rather than continuous approach.
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 method effectively reduces the influence of interference signals over time, preventing misjudged touch events and ensuring accurate detection by updating the base signal to account for varying environmental conditions.
Implementation Method 1
driving the driving electrodes in turns or in groups with a plurality of measuring frequencies, and detecting electrical changes on the sensing electrodes in turn
Data Source
AI summary
A detection and updating method of touch system includes: proceeding an ideal base signal measurement to obtain a plurality of ideal base signals under an ideal state; proceeding a raw base signal measurement to obtain a plurality of raw base signals under a raw state; forming a linear relationship related by the ideal base signals and the raw base signals to obtain two coefficients; calculating a plurality of new base signals according to the two coefficients and the ideal base signals; and, proceeding a base signal updating method by the new base signals.