Capacitive Touch Threshold Updating for False Touch Suppression
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Solution Overview
Problem
Existing electrostatic capacitive touch sensors face instability and false touch issues due to environmental changes, as most algorithms fail to dynamically update noise thresholds and rely on temporary changes, leading to product instability.
Innovation Solution
A method that repeatedly collects detection values from an untouched touch area, compares them to the current environmental threshold, and updates the threshold only when significant changes occur, using a counter to stabilize the system and prevent false touches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the environmental threshold is updated directly according to temporary changes in the environment, then the threshold adapts quickly to environmental changes, but false touches occur easily
Solution Approach 1:
The system performs preliminary actions by repeatedly collecting detection values (first preset number of times) before updating the environmental threshold. This preliminary data collection ensures that the threshold update is based on stable, representative environmental conditions rather than temporary fluctuations, thus preventing false touches while maintaining adaptability
Solution Approach 2:
The system uses feedback mechanisms by comparing detection values with the current environmental threshold and using the counter to determine whether updates should occur. The feedback loop ensures that threshold updates only happen when environmental changes are significant and sustained, balancing adaptability with reliability
2Reliability
If multiple values are collected before updating the noise threshold, then false touches are reduced, but the response time to environmental changes increases
Solution Approach 1:
The system applies partial action by collecting detection values only for a first preset number of times (not continuously) before updating the threshold. This partial sampling approach reduces the time loss compared to continuous collection while still providing enough data to avoid false touches, achieving a balance between reliability and response time
3Ease of operation
If the maximum change value of capacitance is judged without environmental judgment, then the operation is simple, but product instability occurs due to environmental changes
Solution Approach 1:
The system transforms the static judgment process into a dynamic one by introducing environmental judgment based on repeated detection values and counter comparisons. The judgment criteria adapt dynamically based on whether the detection value exceeds the environmental threshold by a second preset value, maintaining simplicity while improving stability
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 dynamic updating process ensures the environmental threshold is adjusted in real-time, reducing false touches and enhancing system stability by distinguishing between temporary and significant environmental changes.
Implementation Method 1
electrostatic capacitive touch sensor detects a change of capacitance of the touch panel
Implementation Method 2
When a human finger touches or approaches a touch panel with the electrostatic capacitive touch sensor, the electrostatic capacitive touch sensor detects a change of capacitance
Data Source
AI summary
The present disclosure discloses a method for updating an environmental threshold in touch sensing, a touch sensor, and a water outlet device. The method repeatedly collects a detection value until a difference obtained by comparing the detection value collected at an Nth repetition with a current environmental threshold is greater than a first threshold and a current value of a counter is greater than a second threshold and then updates the detection value collected at the Nth repetition to the current environmental threshold. In this way, the environmental threshold can be dynamically updated according to environmental changes, thereby reducing incorrect operations.