Touch Sensing System Interference Detection
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Solution Overview
Problem
Conventional touch sensing devices misjudge touch events due to interference from sources like electrostatic discharge or radiation noise, as they cannot dynamically adjust to interference intensity and may compromise component stability and aesthetics.
Innovation Solution
A method and system that dynamically sense capacitance at predetermined intervals, compute absolute differences, and determine the presence of an interference source by comparing capacitance values to a stored threshold, allowing for adaptive adjustments to prevent misjudgments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dimensions of the grounding copper foil are increased to facilitate grounding of radiation noise, then the anti-interference capability is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies dynamics by making the grounding copper foil dimensions adjustable rather than fixed. The control unit dynamically changes the effective grounding area based on detected interference levels, allowing the system to optimize between anti-interference capability and device simplicity in real-time conditions
Solution Approach 2:
The patent changes the parameter of grounding copper foil dimensions from a static value to a dynamically adjustable parameter. By controlling the effective grounding area through selective activation of different portions of the copper foil, the system adapts grounding strength to match interference conditions
2Reliability
If the gaps among components are reduced to reduce propagation of radiation noise, then the anti-interference capability is improved, but the appearance and aesthetics are compromised
Solution Approach 1:
The patent replaces the mechanical/physical approach of reducing component gaps with an electronic/software-based solution. The control unit uses algorithms to detect interference and dynamically adjust grounding parameters, substituting physical restructuring with intelligent control
3Device complexity
If conventional touch sensing devices use fixed threshold values for touch detection, then the device complexity is reduced, but measurement precision deteriorates under interference conditions
Solution Approach 1:
The patent makes the threshold value dynamic by allowing the control unit to adjust it based on detected interference levels and capacitance variations. This dynamic threshold adapts to changing environmental conditions while maintaining accurate touch event detection
Solution Approach 2:
The system implements feedback by continuously monitoring capacitance values and interference levels, then using this information to adjust the threshold value accordingly. The control unit compares detected capacitance changes against adaptive thresholds to distinguish genuine touch events from interference
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
Prevents misjudgments of touch events by accurately distinguishing between interference sources and normal touch events, maintaining component stability and aesthetics while reducing manufacturing costs.
Implementation Method 1
a touch sensor unit; and a sensed signal processing unit coupled to the touch sensor unit, wherein the sensed signal processing unit controls the touch sensor unit to sense a capacitance at every predetermined unit time interval
Data Source
AI summary
A method for detecting presence of an interference source is to be performed by a touch sensing system that stores a threshold capacitance difference. The method includes the steps of sampling capacitances periodically within a time period for obtaining a base capacitance value; sensing a comparison capacitance after the time period; computing an absolute difference between the comparison capacitance and the base capacitance value; and determining that the interference source is present when the comparison capacitance is smaller than the base capacitance value and the absolute difference is greater than the threshold capacitance difference.