Touch Signal Anti-Interference via Dynamic Scanning Frequency
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Solution Overview
Problem
In-vehicle touch screens are prone to signal interference from external electromagnetic and radiation environments, leading to inaccurate touch command reporting and reduced performance.
Innovation Solution
An anti-interference method that adjusts the scanning frequency of the touch control circuit based on capacitance values, storing and comparing touch signal data to filter out interference, and outputting only normal data, enhancing the accuracy and effectiveness of touch control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch control circuit uses a fixed scanning frequency, then the device complexity is reduced, but the measurement precision of touch signal data deteriorates under electromagnetic interference
Solution Approach 1:
The patent implements dynamic scanning frequency adjustment in the touch control circuit. The circuit automatically changes scanning frequency based on detected interference levels, transitioning between first scanning frequency (normal condition) and second scanning frequency (interference condition). This dynamic adaptation resolves the contradiction by optimizing measurement precision without permanently increasing device complexity.
Solution Approach 2:
The patent changes the scanning frequency parameter of the touch control circuit based on environmental conditions. By monitoring touch signal data and detecting electromagnetic interference, the system adjusts the scanning frequency parameter to maintain accurate touch signal measurement, thereby resolving the contradiction between measurement precision and device complexity.
2Measurement precision
If the scanning frequency is increased to improve touch signal detection under interference, then the measurement precision improves, but the use of energy increases
Solution Approach 1:
The system dynamically adjusts scanning frequency based on actual interference conditions rather than maintaining a constantly high frequency. The touch control circuit switches between first scanning frequency (lower energy) and second scanning frequency (higher energy) only when interference is detected, thereby improving measurement precision while minimizing energy consumption.
Solution Approach 2:
The patent implements periodic monitoring of touch signal data to detect interference conditions. The scanning frequency is adjusted periodically based on detected interference, allowing the system to maintain high measurement precision only when necessary, thus reducing overall energy consumption compared to continuous high-frequency scanning.
3Reliability
If the scanning frequency is increased to filter out interference, then the reliability of touch signal reporting improves, but the productivity of touch response decreases
Solution Approach 1:
The touch control circuit dynamically adjusts scanning frequency based on interference detection. During normal operation, it uses the first scanning frequency to maintain fast touch response. When interference is detected, it switches to the second scanning frequency to improve reliability of touch signal reporting, thus resolving the contradiction between reliability and productivity.
Solution Approach 2:
The system changes the scanning frequency parameter based on environmental conditions. By monitoring touch signal data for interference patterns, the system adjusts the scanning frequency parameter to maintain reliable touch signal reporting only when necessary, preserving fast response times during normal operation.
Data Source
AI summary
The embodiment of the present disclosure provides an anti-interference method and apparatus for touch signal. When scanning the touch signal, increasing the scanning frequency of the touch drive circuit to obtain more touch signal data corresponding to interference, and then comparing and removing the abnormal touch signal data, and outputting the finally sifted touch signal data to achieve the purpose of improving the touch effect of the touch screen and the accuracy of the touch screen reported point.