Piezo Inertia Actuator for High Definition Haptic Feedback
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Solution Overview
Problem
Conventional haptic feedback technologies in electronic devices, such as touch screens, face limitations in bandwidth and require high voltages, making them unsuitable for providing high definition haptic feedback, especially with the increasing demand for richer sensory experiences in high-definition displays.
Innovation Solution
A haptic device utilizing an elongated piezo bender supported by holders, with a mass positioned between them, and an electrical driving signal generator to create vibrations, allowing for adjustable natural frequency and effective haptic feedback without the need for high voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional electric actuators (LRA or ERM) are used for haptic feedback, then haptic effects can be provided, but the bandwidth is very limited and cannot perform sufficiently in haptic applications
Solution Approach 1:
The patent replaces conventional electric actuators (LRA/ERM) with a piezoelectric-based mechanical system. The piezoelectric element converts electrical signals directly to mechanical displacement, enabling higher bandwidth operation while maintaining sufficient haptic performance through resonant frequency exploitation and inertial mass coupling.
Solution Approach 2:
The patent changes the operating parameters by using piezoelectric materials that respond to high-frequency electrical signals, thereby increasing the bandwidth from the limited range of conventional actuators to a much broader frequency range suitable for high-definition haptic feedback applications.
2Power
If electro-active polymer (EAP) devices are used for haptic feedback, then haptic effects can be provided, but thousands of volts of electricity are required
Solution Approach 1:
The patent substitutes EAP devices with piezoelectric elements that operate at standard voltage levels. The piezoelectric material generates mechanical strain directly from low-voltage electrical signals, eliminating the need for high-voltage power supplies while maintaining effective haptic feedback capability.
Solution Approach 2:
The patent changes the electrical operating parameters from thousands of volts (EAP) to standard low-voltage levels (piezoelectric). This parameter change is achieved by selecting piezoelectric materials with high coupling coefficients that can produce sufficient mechanical displacement at low voltage, thereby reducing power requirements while maintaining haptic effectiveness.
3Measurement precision
If display screens having high definition have increased, then visual quality is improved, but the need for high definition haptic feedback has increased, which existing technologies cannot meet
Solution Approach 1:
The patent employs mechanical vibration at high frequencies to generate haptic feedback that matches the high definition visual output. By driving the piezoelectric element at resonant frequencies, the system produces precise, high-frequency vibrations that correspond to the fine detail capabilities of high-definition displays, creating a matched sensory experience.
Solution Approach 2:
The patent implements a dynamic haptic feedback system that can adapt its frequency and amplitude characteristics in real-time. The piezoelectric-based actuator can rapidly change its operating parameters to match the temporal and spatial requirements of high-definition visual content, providing versatile haptic feedback that adapts to different display scenarios.
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 provides enhanced haptic feedback with adjustable frequency and amplitude, improving user experience in high-definition displays by overcoming the limitations of existing technologies in bandwidth and voltage requirements.
Implementation Method 1
an elongated piezo bender supported by a first holder and a second holder... an electrical driving signal generator configured to generate a signal to create a vibration in the elongated piezo bender
Data Source
AI summary
A haptic device includes an elongated piezo bender supported by a first holder and a second holder. The first holder and the second holder being spaced apart from each other and located at or near opposite ends of the elongated piezo bender. A mass is supported by the elongated piezo bender and positioned in between the first holder and the second holder. The mass has a non-uniform thickness in a direction along a major axis of the elongated piezo bender. An electrical driving signal generator is configured to generate a signal to create a vibration in the elongated piezo bender.