Capacitive Touch Auto-Calibration for Signal Saturation
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Solution Overview
Problem
Capacitive touch systems face signal saturation issues due to processing or packaging diversity, leading to detection errors at touch points, making it difficult to accurately distinguish signals and detect touch inputs.
Innovation Solution
A capacitive touch system with auto-calibration that includes a driving signal generator, induced signal receiver, and initial value generator, where pre-stored initial values are used to initialize the signal receiver, preventing signal saturation and enhancing detection accuracy by compensating for variations in capacitive coupling across touch points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal processing is performed without initial value initialization, then the device complexity is reduced, but signal saturation occurs leading to detection errors
Solution Approach 1:
The patent applies preliminary action by measuring and storing initial values of induced signals at no-touch points before actual touch detection. These initial values are then subtracted from subsequent touch signals to compensate for capacitive coupling variations, preventing signal saturation and improving detection accuracy without requiring complex real-time processing adjustments
2Measurement precision
If auto-calibration with initial value initialization is implemented, then detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent uses copying by creating a digital copy of the initial signal characteristics at no-touch points and storing them in memory. This copied initial value data is then reused for calibration purposes, avoiding the need for complex real-time recalibration circuits while maintaining high detection accuracy through consistent reference values
3Reliability
If signal saturation is prevented through initialization, then the reliability of touch detection is improved, but loss of time occurs during initial value measurement and application
Solution Approach 1:
The patent performs the time-consuming initial value measurement and calibration setup in advance, during manufacturing or system initialization, rather than during each touch interaction. This preliminary calibration establishes reference values that are then rapidly applied during operation, ensuring high reliability without significant time loss during actual use
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 auto-calibration method effectively prevents signal saturation, improving the accuracy of touch detection by dynamically adjusting initialization and compensating for capacitive coupling variations, thereby enhancing the reliability of touch input recognition.
Implementation Method 1
the first electrode to be driven coupling the driving signal according to capacitive coupling effect to generate induced signals on the second electrode
Data Source
AI summary
The present invention is directed to a capacitive touch system and method with auto-calibration. A driving signal generator provides driving signals to first electrodes, thereby resulting in induced signals on second electrodes. An induced signal receiver receives and processes the induced signals. The induced signals associated with at least some no-touch points are measured and pre-stored in an initial value generator, which, at the beginning of a measuring period, generates initial induced signals of the second electrodes according to the pre-stored induced signals for initializing the induced signal generator.