Piezoelectric Haptic Actuator with Acceleration Feedback
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Solution Overview
Problem
Haptic feedback devices using piezoelectric elements face reliability issues due to temperature-dependent changes in piezoelectric constants, leading to non-uniform feedback, especially on large screens where manufacturing deviations compound these problems.
Innovation Solution
A display panel integrated with a piezoelectric device that includes multiple piezoelectric elements, acceleration sensors, and a compensator. The compensator adjusts driving signals based on temperature data from temperature sensors to maintain consistent output, and on acceleration data from acceleration sensors to correct for performance deviations across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If piezoelectric elements are used as actuators in haptic feedback devices, then vibration output can be generated, but uniform feedback cannot be provided under varying temperature conditions due to changes in piezoelectric constants
Solution Approach 1:
The patent employs acceleration sensors to detect actual vibration output from piezoelectric elements and feeds this information back to a controller. The controller adjusts driving signals based on the detected acceleration information to compensate for temperature-induced variations in piezoelectric constants, ensuring uniform haptic feedback across different operating conditions
Solution Approach 2:
The system dynamically changes the driving parameters (voltage, frequency) of piezoelectric elements based on detected temperature effects and acceleration feedback. By adjusting these parameters in real-time, the system compensates for changes in piezoelectric constants and maintains consistent vibration output despite temperature variations
2Productivity
If piezoelectric elements are manufactured by the same process, then production efficiency is maintained, but performance deviation occurs leading to non-uniform feedback on large screens
Solution Approach 1:
The patent applies local compensation by individually adjusting driving signals for each piezoelectric element or group based on locally detected acceleration information. This allows performance deviations in specific regions (especially on large screens) to be compensated without affecting overall production efficiency, as the compensation is automatically applied during operation
Solution Approach 2:
The system performs self-compensation by using acceleration sensors to automatically detect performance deviations and trigger corrective adjustments to driving signals. This self-service mechanism eliminates the need for manual calibration of each piezoelectric element, maintaining production efficiency while ensuring performance uniformity
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
This solution ensures uniform haptic feedback across a display panel, regardless of temperature changes or manufacturing deviations, enhancing the reliability of haptic feedback by compensating for variations in piezoelectric element performance.
Implementation Method 1
a piezoelectric element has been mainly used as an actuator to generating the vibration output
Implementation Method 2
a plurality of acceleration sensors configured to detect acceleration information of vibrations in different regions of the panel
Data Source
AI summary
There is provided a display panel including a piezoelectric device and a method for compensating properties of a piezoelectric device. According to the an exemplary embodiment of the present disclosure, the display panel includes: a panel; and a piezoelectric device coupled with the panel, wherein the piezoelectric device includes: a plurality of piezoelectric elements disposed at different positions of the panel and each configured to generate vibrations according to a driving signal; a driver configured to supply the driving signal to the plurality of piezoelectric elements; a plurality of acceleration sensors configured to detect acceleration information of vibrations in different regions of the panel; and a compensator configured to control the driving signal to compensate for property deviations of the plurality of piezoelectric elements, based on the acceleration information.