Capacitive Touch Panel Baseline Recalibration for Misjudgment Prevention
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Solution Overview
Problem
Capacitive touch panels often misjudge touch points due to incorrect data baseline values caused by conductive materials or environmental temperature changes, leading to inaccurate touch detection.
Innovation Solution
A touch device with a touch panel and a detecting unit that recalibrates data baseline values when abnormal touch data is detected, using re-calibration thresholds to adjust capacitance values and prevent misjudgment, allowing for continuous scanning and recalibration during non-touch screen periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the capacitive touch panel is near or attached by conductive material during initialization, then the touch panel can be calibrated, but the data baseline values recorded result in misjudgment of the touch point
Solution Approach 1:
The patent performs preliminary calibration actions by scanning the touch panel in a specific sequence (first scanning, then second scanning) before actual touch detection. During initialization, the system records baseline values and performs preliminary scans to establish accurate reference data before real touch events occur, preventing conductive material interference from affecting touch point judgment
Solution Approach 2:
The patent implements feedback mechanisms by continuously monitoring touch data and comparing it against baseline values. When abnormal touch data is detected (indicating potential conductive material interference or temperature-induced drift), the system triggers re-calibration by performing additional scans and adjusting baseline values, thereby maintaining accurate touch point detection
2Adaptability or versatility
If the capacitance of the capacitive touch panel changes along with temperature, then the touch panel adapts to environmental changes, but the touch device misjudges the touch point
Solution Approach 1:
The patent uses feedback loops that continuously monitor touch data and compare it against baseline values. When temperature-induced capacitance changes cause abnormal touch data patterns, the system detects this through the feedback mechanism and triggers re-calibration by performing additional scans and adjusting baseline values, thereby maintaining accurate touch point detection despite temperature variations
Solution Approach 2:
The patent makes the calibration process dynamic by allowing baseline values to be updated and adjusted in response to changing environmental conditions. Instead of using fixed baseline values, the system dynamically re-calibrates when temperature changes or other environmental factors cause abnormal touch data, ensuring continuous adaptation while maintaining measurement precision
3Measurement precision
If the touch device performs continuous scanning and recalibration, then the touch point detection accuracy is maintained, but the device complexity increases
Solution Approach 1:
The patent implements periodic scanning and recalibration actions rather than continuous operation. The system performs initial calibration during initialization, then conducts periodic scans at specific intervals or when abnormal data is detected. This periodic approach maintains measurement precision while reducing the complexity burden compared to continuous recalibration
Solution Approach 2:
The patent enables the touch panel to perform self-calibration by automatically detecting when re-calibration is needed and executing the calibration process autonomously. The system monitors its own performance through feedback mechanisms and triggers self-service recalibration when baseline values become inaccurate, eliminating the need for external intervention and simplifying the overall 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
The solution effectively avoids misjudgment of touch points by recalibrating data baseline values, improving the accuracy and reliability of touch detection in capacitive touch panels, especially when influenced by conductive materials or temperature changes.
Implementation Method 1
The capacitive touch panel utilizes the use of finger or conductive material to be near or to touch the touch panel, causing change in capacitance of the touch panel, so as to determine a touch point of the capacitive touch panel through the change in capacitance
Data Source
AI summary
A touch device and an operating method thereof are provided. The operating method includes the following steps. A plurality of data baseline values of the touch panel is calibrated and set during an initialization of a touch panel. A plurality of touch data is obtained after scanning the touch panel. A plurality of touch values corresponding to the touch panel is calculated according to the data baseline values and the touch data. A touch point is detected according to the touch values. When the touch data is complied with a re-calibration requirement, the data baseline values are re-calibrated and reset.