Piezoelectric Interface Waveform Scaling for Stable Haptic Feedback
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Solution Overview
Problem
Existing driver circuits for piezoelectric elements struggle to efficiently drive multiple elements simultaneously under varying conditions, such as temperature changes and load variations, leading to distorted voltage waveforms and compromised user experience.
Innovation Solution
A controller that scales the target voltage waveform based on advance configuration and dynamic feedback information, adjusting amplitude and duration to accommodate changing conditions and load demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If piezoelectric elements are integrated into a touchscreen display, then haptic feedback functionality is added, but the risk of cracking the display increases
Solution Approach 1:
The piezoelectric element is divided into multiple smaller segments arranged in an array, with each segment corresponding to a specific display region. This segmentation allows localized haptic feedback without requiring a single large piezoelectric element that would exert excessive force on the display, thereby reducing cracking risk while maintaining versatility.
Solution Approach 2:
Different regions of the display have dedicated piezoelectric segments that provide localized haptic feedback tailored to specific interaction zones. This local quality approach ensures that haptic force is applied precisely where needed rather than across the entire display, reducing overall stress on the display structure.
2Ease of operation
If piezoelectric elements are used for haptic feedback, then user interaction is enhanced, but power consumption increases
Solution Approach 1:
The piezoelectric elements are driven using periodic electrical signals that correspond to the desired haptic feedback patterns. By using periodic rather than continuous excitation, the system provides haptic feedback only when needed for user interaction, significantly reducing overall power consumption while maintaining ease of operation.
Solution Approach 2:
Instead of activating all piezoelectric segments simultaneously or continuously, the system activates only the specific segments needed for the current interaction context. This partial action approach reduces power consumption while preserving enhanced user interaction capabilities where required.
3Adaptability or versatility
If piezoelectric elements are integrated into the display, then haptic feedback is provided, but manufacturing complexity increases
Solution Approach 1:
The piezoelectric element array serves multiple functions: it provides haptic feedback, acts as a structural component of the display assembly, and enables various interaction modes (touch, pressure, gesture recognition). This multi-functionality reduces the need for separate components, thereby managing manufacturing complexity while maintaining versatility.
Solution Approach 2:
The piezoelectric elements are integrated within the existing display structure, with each piezoelectric segment nested within its corresponding display region. This nesting approach allows the haptic feedback system to be incorporated into the display manufacturing process without requiring completely separate assembly steps, reducing overall manufacturing complexity.
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
Ensures consistent and reliable haptic feedback by accurately controlling voltage waveforms, even under diverse conditions, without overdimensioning components, thus maintaining user experience quality.
Implementation Method 1
The first-mentioned involves sensing a voltage that the piezoelectric element generates in response to mechanical deformation
Implementation Method 2
the latter involves applying a voltage waveform to the piezoelectric element that temporarily deforms it mechanically, causing a corresponding elastic movement in the surrounding structures
Data Source
Figure 1~2
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Figure 6~8
AI summary
Piezoelectric user interface arrangement comprises a voltage converter (103) for controllably generating voltage waveforms driving one or more piezoelectric elements (101). The voltage converter (103) has a control input (201). A controller (105) is coupled (202) to said control input (201) to control an output voltage of said voltage converter (103). The controller (105) has one or more scaling inputs (203, 204, 205, 208). The controller (105) forms said control signals to make said output voltage follow a target waveform (301) as a function of time. The controller (105) is configured to scale said target waveform on the basis of scaling information received through said one or more scaling inputs (203, 204, 205, 208).