Piezoelectric Element Voltage Control for Tactile Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Piezoelectric elements in electronic devices do not operate normally unless an appropriate voltage is controlled, leading to reduced vibration amplitude or depolarization when voltage conditions are not met.
Innovation Solution
An electronic device with a control unit that applies a driving signal ensuring the positive electrode voltage is equal to or greater than the negative electrode voltage, and the minimum positive electrode voltage is greater than or equal to the maximum negative electrode voltage, preventing depolarization and optimizing vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage is applied to the piezoelectric element without controlling the voltage relationship between electrodes, then the piezoelectric element can be activated, but the vibration amplitude becomes smaller and depolarization occurs
Solution Approach 1:
The patent applies parameter changes by controlling the voltage parameters of the piezoelectric element's electrodes. Specifically, it ensures that the positive electrode voltage is always equal to or greater than the negative electrode voltage, and the minimum positive electrode voltage is equal to or greater than the maximum negative electrode voltage. This parameter control prevents depolarization and ensures normal operation of the piezoelectric element.
2Ease of operation
If the piezoelectric element is used to vibrate the touch panel, then tactile sensation is provided, but the vibration amplitude is insufficient when voltage is not appropriately controlled
Solution Approach 1:
The patent optimizes the vibration amplitude by controlling the voltage parameters applied to the piezoelectric element. By ensuring that the positive electrode voltage is always equal to or greater than the negative electrode voltage, and that the minimum positive electrode voltage is equal to or greater than the maximum negative electrode voltage, the piezoelectric element generates sufficient vibration amplitude to provide effective tactile sensation on the touch panel.
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 normal operation of the piezoelectric element by preventing depolarization, enhancing vibration amplitude and providing a satisfactory tactile sensation with controlled voltage application.
Implementation Method 1
an electronic device with a touch panel such as devices such as calculators, ticket vending machines and the like, home appliances such as microwaves, TV sets, lighting equipment and the like, and industrial equipment (FA equipment) and the like are widely used. In such an electronic device having a touch panel, there is known an electronic device in which slippage of a touch panel from a fixing frame thereof is prevented, and in which a satisfactory feel of operation can be provided as well by attaching piezoelectric elements at the ends of the touch panel and by, when an input operation is executed by pressing the touch panel, operating the piezoelectric elements to vibrate the touch panel
Implementation Method 2
a press detection unit configured to detect a press applied on an operation face of the touch panel is further included
Data Source
AI summary
An electronic device capable of applying an appropriate driving signal to a piezoelectric element is provided. The electronic device 1 includes a piezoelectric element 31 and a control unit 40 configured to apply a driving signal to the piezoelectric element 31, and the control unit 40 applies a driving signal so that a voltage of a positive electrode of the piezoelectric element 31 is equal to or greater than a voltage of a negative electrode thereof.