Piezoelectric Key Signal Detection for False-Press Prevention
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Solution Overview
Problem
Traditional mechanical keys have limited service life and poor control experience, leading to inaccurate key presses and user experience issues due to signal errors from long-term usage.
Innovation Solution
A key detection method and system that collects voltage values during key presses, performs curve fitting, and determines the key's state by analyzing derivatives to ensure accurate detection and reduce false presses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mechanical keys are used, then the key structure is simple and easy to manufacture, but the service life is limited and detection accuracy deteriorates after long-term usage
Solution Approach 1:
The patent replaces traditional mechanical key detection with a piezoelectric effect-based detection system. The piezoelectric key uses voltage signal changes generated by mechanical stress on piezoelectric materials to detect key presses, substituting mechanical contact detection with electrical signal detection. This resolves the contradiction by maintaining simple key structure while significantly improving detection accuracy and service life.
Solution Approach 2:
The patent changes the detection parameter from mechanical contact to voltage signal characteristics. By monitoring voltage changes, pressing duration, and press/release timing, the system achieves high detection accuracy. The curve fitting and derivative analysis of voltage signals provide precise detection without mechanical wear, resolving the accuracy vs. complexity contradiction.
2Reliability
If touch keys or piezoelectric keys are used to improve service life, then the key structure is updated, but false presses occur after long-term usage leading to poor control experience
Solution Approach 1:
The patent implements a feedback mechanism by comparing detected key press characteristics against predetermined sets of valid press patterns. The system analyzes voltage curves, pressing duration, and press/release timing, comparing these against stored reference patterns to determine whether a press is intentional or accidental. This feedback loop eliminates false presses while maintaining ease of operation for valid inputs.
Solution Approach 2:
The patent uses dynamic analysis of voltage signal characteristics including curve fitting and derivative calculations to distinguish between intentional presses and accidental touches. By analyzing the temporal and amplitude characteristics of voltage changes, the system dynamically adapts to different pressing patterns, ensuring accurate detection of user intent while preventing false triggers.
3Measurement precision
If voltage collection and curve fitting analysis are performed, then detection accuracy is improved, but the processing time and computational complexity increase
Solution Approach 1:
The patent applies partial analysis by focusing on specific critical characteristics of the voltage signal rather than analyzing the entire signal in detail. By identifying and analyzing only the most discriminative features (voltage extremes, pressing duration, press/release timing points), the system achieves high detection precision while minimizing processing time and computational resources required.
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 method provides high accuracy in key detection, preventing signal errors and enhancing user experience by accurately determining the key's state and reducing false triggers.
Implementation Method 1
piezoelectric effect keys
Data Source
AI summary
The present disclosure provides a key detection method and system, the method comprises: collecting voltage values of a key during a period from pressing to releasing according to a predetermined frequency, to obtain a voltage data set corresponding to the key; performing a curve fitting on the voltage values in the voltage data set and time to obtain a first fitting curve; obtaining a time set in which a derivative of the first fitting curve is zero, and comparing the time set with a first predetermined set to obtain a first comparison result; obtaining a positive and negative derivative set of each element in the time set within a predetermined range based on the first comparison result, and comparing it with a second predetermined set to obtain a second comparison result; determining current state information of the key based on the first comparison result and the second comparison result.