Capacitive Touch Error Compensation Under EMI and Power Noise
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Solution Overview
Problem
Electronic devices with capacitive touch screens experience touch recognition errors due to environmental factors such as radiation noise from electric and magnetic fields, and unstable power supply from Travel Adapters, leading to inaccuracies in touch input and display.
Innovation Solution
The implementation of a method and apparatus that compensates for touch errors by using noise reduction filters, adjusting touch sensitivity, and changing frequency schemes in electronic devices with capacitive touch screens, which identifies and addresses touch errors through specific algorithms and filter applications based on error occurrence counts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a capacitive touch scheme is used to increase display area and eliminate separate input units, then space utilization is improved and display area is increased, but touch recognition accuracy deteriorates due to environmental interference
Solution Approach 1:
The patent introduces a travel adapter as an intermediary component between the power source and the electronic device. This travel adapter includes a capacitor that acts as a buffer to stabilize voltage fluctuations and filter electromagnetic interference from the power source, thereby preventing touch recognition errors while maintaining the capacitive touch screen's full display area
Solution Approach 2:
The patent implements a feedback mechanism where the electronic device detects touch recognition errors, identifies them as originating from the travel adapter, and automatically adjusts or disables the travel adapter's power output. This feedback loop continuously optimizes the power delivery to maintain accurate touch recognition while preserving the large display area benefit
2Measurement precision
If noise reduction filters are applied to reduce touch recognition errors, then touch input accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies noise reduction filters and capacitive buffering in advance, before touch input errors occur. The travel adapter's capacitor pre-stabilizes the power supply, and the system pre-configures filter parameters to block electromagnetic interference from reaching the touch sensor, thereby improving touch input accuracy without adding complex real-time processing
3Measurement precision
If touch sensitivity is adjusted to compensate for errors, then touch recognition accuracy is improved, but ease of operation deteriorates due to requiring manual adjustment
Solution Approach 1:
The patent implements a self-service mechanism where the electronic device automatically detects touch recognition errors caused by the travel adapter and autonomously adjusts touch sensitivity parameters or disables the travel adapter's interference-generating functions. This eliminates the need for manual user adjustment, thereby improving touch recognition accuracy while maintaining ease of operation
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 solution effectively reduces touch recognition errors by applying noise reduction filters, adjusting sensitivity, and changing frequencies, thereby improving the accuracy and reliability of touch input in capacitive touch screen devices, even in environments with radiation noise and unstable power supplies.
Implementation Method 1
If employing the capacitive touch scheme, the portable electronic device determines the touch coordinate considering a variation of capacitance that occurs at a time the user touches the touch screen with the finger and the like
Implementation Method 2
the portable electronic device using the capacitive touch scheme can suffer the touch recognition error, because a capacitance variation error takes place due to the affection of the electric field and the magnetic field of the surroundings
Data Source
AI summary
An apparatus and method compensate for a touch error in an electronic device with a touch screen. A method for compensating a touch error includes identifying if a touch error takes place and, when the touch error takes place, compensating the touch error using at least one touch error compensation scheme among a noise reduction filter addition scheme, a touch sensibility adjustment scheme, and a touch frequency change scheme.