Capacitive Touch Threshold Adaptation for Noise
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Solution Overview
Problem
In environments with multiple operating machine tools, capacitive touch screens in display devices face challenges in setting appropriate thresholds for touch detection due to varying noise levels, leading to potential erroneous touch operation detection and decreased sensitivity.
Innovation Solution
A system that dynamically switches between operability emphasis and high noise resistance modes by transmitting change amount data of electrostatic capacitance to a management device, which determines the operation mode and sets corresponding touch thresholds based on ambient noise levels, allowing for accurate noise level measurement and reduced detection errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high threshold is set for identifying touch presence to reduce noise influence, then noise resistance improves, but touch panel sensitivity and operability decrease
Solution Approach 1:
The patent applies dynamics by making the threshold value adjustable and changeable based on operating conditions. The control device dynamically modifies the threshold according to the number of operating machine tools and noise levels, transitioning between a first threshold value (lower sensitivity, higher noise resistance) and a second threshold value (higher sensitivity, lower noise resistance). This resolves the contradiction by allowing the system to adapt the threshold to current environmental conditions rather than using a fixed value.
Solution Approach 2:
The patent implements parameter changes by modifying the threshold parameter based on the operating state of multiple machine tools. When noise levels are high (more machine tools operating), the system switches to a first threshold value optimized for noise resistance. When noise levels are low (fewer machine tools operating), the system switches to a second threshold value optimized for sensitivity. This parameter adaptation resolves the contradiction between noise resistance and operability.
2Device complexity
If a fixed threshold is used for touch detection, then device complexity is reduced, but the system cannot adapt to varying noise levels from multiple operating machine tools
Solution Approach 1:
The patent implements feedback by having the control device monitor the operating state of machine tools and the noise level detected by the touch panel, then using this information to automatically adjust the threshold value. The control device receives information about which machine tools are operating, determines the corresponding noise level, and switches between threshold values accordingly. This feedback mechanism enables adaptation to varying noise levels without requiring complex manual configuration.
Solution Approach 2:
The system applies self-service by automatically adjusting the threshold value based on the operating conditions without requiring manual intervention. The control device autonomously monitors the operating state of machine tools, determines the appropriate noise level, and switches between threshold values on its own. This self-adjusting capability provides adaptability to varying noise environments while maintaining relative simplicity in the system architecture.
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 system enhances touch panel noise resistance and operability by adjusting thresholds according to noise levels, improving detection accuracy and preventing erroneous touch operation detection, while also managing noise distribution across machine tools to maintain efficient operation.
Implementation Method 1
since an electrostatic capacitance changes when noise is applied as well as when a touch operation is input
Data Source
AI summary
A display device, a management device, a management system, and a control program for switching between an operability emphasis mode where a light touch operation is possible and a high noise resistance mode dynamically depending on an ambient noise state are provided. A display device including a capacitive touch screen includes: a transmitting unit that transmits change amount data of an electrostatic capacitance detected by the touch panel to a management device; and a setting unit that receives an operation mode determined by the management device according to the change amount data and sets a threshold for identifying presence of a touch corresponding to the operation mode to the touch panel.