Transparent Piezoelectric Display Actuator for Front-Facing Sound
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Solution Overview
Problem
Existing vibration generation devices for display apparatuses, such as those using piezoelectric actuators, face challenges in providing effective haptic feedback and sound quality due to their placement on the rear surface, which leads to interference with sound waves and reduced immersion experience, especially when audio devices are positioned behind the display panel.
Innovation Solution
A vibration generation device is designed to be integrated on the front surface of display apparatuses, utilizing transparent piezoelectric materials and opaque piezoelectric ceramic parts with electrode structures to provide both haptic effects and light control, allowing sound to travel directly to the user while minimizing light reflection and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the audio device is disposed on the rear surface of the display panel, then the structure is simplified and components are easier to integrate, but sound quality is degraded and immersion experience is reduced due to sound wave interference from reflections off surrounding structures
Solution Approach 1:
The patent inverts the conventional placement of the audio device from the rear surface to the front surface of the display panel. This inversion allows sound to be emitted directly toward the user without reflecting off surrounding structures, thereby eliminating sound wave interference while maintaining compact integration.
2Reliability
If a piezoelectric actuator is used to provide haptic effects, then vibration feedback capability is improved, but the device becomes opaque and light transmission is blocked
Solution Approach 1:
The patent applies local quality by making the piezoelectric actuator transparent only in the region where light transmission is needed, while maintaining piezoelectric functionality. This is achieved by using a transparent piezoelectric material that allows light to pass through while still generating the necessary vibrations for haptic feedback.
Solution Approach 2:
The patent employs composite materials by combining transparent piezoelectric material with electrode structures and transparent conductive layers. This composite structure maintains the piezoelectric effect for haptic feedback while allowing light transmission, thus resolving the contradiction between opacity and transparency.
3Object-affected harmful factors
If the vibration generation device is disposed on the front surface, then sound quality and haptic feedback are improved, but the device structure becomes more complex
Solution Approach 1:
The patent applies multi-functionality by designing the vibration generation device to simultaneously serve as both a sound emission source and a haptic feedback mechanism. By integrating these functions into a single front-surface component, the patent avoids adding separate structures, thereby improving sound quality and haptic feedback without proportionally increasing device 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
This configuration enhances sound quality and immersion by directing sound towards the user, improving haptic feedback, and reduces light interference, thereby increasing the overall user experience and display visibility.
Implementation Method 1
A piezoelectric actuator using a piezoelectric material generating mechanical energy such as vibration in response to an electrical signal
Data Source
AI summary
The present disclosure relates to a vibration generation device, a display apparatus including the vibration generation device, and a vehicle including the vibration generation device. A vibration generation device includes a piezoelectric ceramic part having a certain interval, a piezoelectric material layer between the piezoelectric ceramic parts, and an electrode part configured to provide electric field to one or more of the piezoelectric ceramic part and the piezoelectric material layer.