Mobile Terminal Proximity Touch Calibration
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Solution Overview
Problem
Mobile terminals face challenges in calibrating touch recognition rates due to variations in capacitance generated by different users, affecting the accuracy of proximity touch inputs.
Innovation Solution
A mobile terminal with a sensing unit and controller that detects real and proximity touches, displaying reference and guide figures to set maximum and minimum capacitance values, allowing for accurate calibration and differentiation between real and proximity touches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If proximity touch detection is implemented without calibration, then the device can respond to touch inputs, but the recognition accuracy varies due to different user capacitances
Solution Approach 1:
The system performs calibration before actual touch detection by having the user position their hand at specified heights and storing the signal amplitudes. This preliminary calibration action establishes user-specific capacitance reference values, enabling accurate touch recognition for that particular user without requiring continuous adaptation during normal operation.
Solution Approach 2:
The calibration process uses feedback from the proximity sensor to adjust and store capacitance values. The system measures signal amplitudes at different hand heights, compares these against reference values, and uses this feedback to determine accurate touch positions, thereby compensating for variations in user capacitance.
2Measurement precision
If calibration is performed for each user, then touch recognition accuracy improves, but the calibration process adds complexity and time
Solution Approach 1:
The calibration is performed as a one-time preliminary action during device setup or first use. Once the user's capacitance characteristics are measured and stored, the system can immediately use these pre-computed values for accurate touch recognition without requiring repeated calibration during normal operation.
Solution Approach 2:
The system automatically performs calibration without requiring complex manual intervention. The user simply needs to position their hand at the specified heights during the calibration process, and the system automatically measures, processes, and stores the capacitance values, making the calibration process quick and user-friendly.
3Ease of operation
If the touch screen responds to all proximity inputs, then user interaction is convenient, but false triggers occur due to capacitance variations
Solution Approach 1:
The system applies different sensitivity thresholds for different touch scenarios. During calibration, the system determines specific capacitance ranges for valid touches, and during normal operation, it uses these localized thresholds to distinguish between intentional touches and false triggers, thereby maintaining both convenience and reliability.
Solution Approach 2:
The system continuously monitors the proximity sensor output and compares it against the calibrated capacitance ranges. This feedback mechanism allows the system to accept touches that fall within the calibrated range (maintaining convenience) while rejecting touches that fall outside the range (preventing false triggers), thus improving reliability.
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
Enhances the accuracy of touch input operations by calibrating recognition rates, enabling precise control of objects on the screen based on proximity position and speed, improving user interaction with touch-sensitive interfaces.
Implementation Method 1
calibrating recognition rates generated due to a difference of capacitances upon the pointer inputting a proximity touch
Data Source
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AI summary
Disclosed are a mobile terminal having a proximity touch and a method for controlling a display screen thereof. A difference of recognition rates caused by a minute difference of capacitances generated when a human body approaches a touch screen depending on users can be calibrated to be suitable for each user. Also, in the state of the recognition rate being calibrated, operations of objects, i.e., icons, avatars and menus, displayed on a wallpaper and displaying effects on the wallpaper can variously be controlled according to a user's proximity touch, thereby allowing users to control the display screen more conveniently and accurately.