Piezoelectric Tactile Feedback Threshold Adjustment
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Solution Overview
Problem
Existing electronic devices with tactile sensation providing functions often cause discomfort due to inaccurate detection of press and release thresholds, leading to inappropriate tactile feedback.
Innovation Solution
An electronic device equipped with a tactile sensation providing unit using a piezoelectric element that adjusts data thresholds based on press data and elapsed time, ensuring accurate and comfortable tactile feedback by dynamically changing press and release threshold voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed threshold values are used for tactile sensation detection, then the device structure remains simple, but the tactile feedback becomes inaccurate and causes operator discomfort
Solution Approach 1:
The patent applies dynamics by transitioning from fixed threshold values to dynamically adjustable thresholds that change based on operational conditions. The controller automatically modifies the threshold voltage for piezoelectric element detection according to the elapsed time since the last tactile sensation provision, enabling the system to adapt to varying press forces and operational states, thereby improving detection accuracy without requiring complex manual calibration mechanisms
Solution Approach 2:
The patent implements parameter changes by modifying the threshold voltage parameter of the piezoelectric element based on elapsed time. After providing tactile sensation, the controller increases the threshold voltage to prevent false detection during the recovery period, then gradually decreases it back to the initial value. This dynamic parameter adjustment ensures accurate differentiation between intentional user presses and residual electrical states, solving the measurement precision problem
2Ease of operation
If the tactile sensation is provided frequently without threshold adjustment, then the user interaction remains responsive, but the operator experiences discomfort due to inappropriate tactile feedback
Solution Approach 1:
The patent applies feedback by implementing a closed-loop control system that monitors the elapsed time since the last tactile sensation provision and uses this information to adjust the detection threshold. The controller continuously evaluates the current state against the threshold and modifies it accordingly, ensuring that tactile feedback is only provided when genuine user input is detected. This feedback mechanism eliminates inappropriate feedback that causes discomfort while maintaining responsive interaction for valid user actions
Solution Approach 2:
The patent implements preliminary action by proactively adjusting the threshold voltage before potential false detection can occur. Immediately after providing tactile sensation, the controller increases the threshold voltage in advance to prevent false positive detection during the piezoelectric element's recovery period. This preliminary threshold adjustment ensures that subsequent tactile feedback is only triggered by genuine user presses, eliminating the harmful effect of inappropriate feedback that causes operator discomfort
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 improves tactile sensation provision by accurately differentiating press and release states, preventing discomfort and enhancing user experience through adaptive threshold adjustments.
Implementation Method 1
a tactile sensation providing unit configured to provide a tactile sensation to a contact object being in contact with a panel
Data Source
AI summary
An electronic device includes a tactile sensation providing unit 30 configured to provide a tactile sensation to a contact object being in contact with a panel 10 and a controller 50 configured to control the tactile sensation providing unit 30 on the basis of data based on press to the panel 10 and data threshold corresponding to the data. After the tactile sensation providing unit 30 provides a tactile sensation, the controller 50 changes the data threshold in response to the data based on press to the panel 10.