Piezoelectric Composite Vibration Device for Display Sound
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Solution Overview
Problem
Existing display apparatuses face challenges in providing effective sound reproduction due to the limited design and spatial disposition caused by separate speakers, and the fragility of piezoelectric elements used in thin film speakers.
Innovation Solution
A display apparatus with a new structure that includes a vibration device disposed on the rear surface of the display panel, utilizing a piezoelectric composite layer with alternating inorganic and organic material portions to enhance sound pressure characteristics and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate speaker is installed for sound reproduction, then sound quality is improved, but the design and spatial disposition are limited due to space occupation
Solution Approach 1:
The patent merges the speaker function with the display panel by integrating a vibration device that directly vibrates the display panel to generate sound. This eliminates the need for a separate speaker, thereby improving sound quality while maintaining design flexibility and spatial disposition freedom.
Solution Approach 2:
The display panel serves multiple functions: it displays images and also acts as a sound reproduction device through the vibration device. This multi-functionality allows the same component to fulfill both display and audio roles, resolving the contradiction between sound quality and design complexity.
2Reliability
If a traditional actuator (magnet and coil) is used for the speaker, then sound reproduction capability is achieved, but the thickness becomes large
Solution Approach 1:
The patent replaces the traditional electromagnetic actuator (magnet and coil) with a piezoelectric-based vibration device. The piezoelectric element converts electrical signals directly into mechanical vibrations, eliminating the need for magnetic and coil components, thereby achieving thinness while maintaining sound reproduction capability.
Solution Approach 2:
The patent changes the operating principle from electromagnetic actuation to piezoelectric actuation. This parameter change in the underlying physical mechanism enables the transition from thick traditional actuators to thin piezoelectric elements, resolving the thickness issue.
3Length of stationary object
If piezoelectric elements are used to achieve thinness, then thickness is reduced, but the elements are fragile and easily damaged by external impact, reducing reliability
Solution Approach 1:
The patent employs a composite structure where the piezoelectric element is integrated with the display panel substrate and encapsulation layers. This composite design provides mechanical protection to the fragile piezoelectric element while maintaining thinness, thereby improving reliability without sacrificing thickness reduction.
Solution Approach 2:
The patent incorporates encapsulation layers and structural support elements around the piezoelectric component to provide beforehand protection against external impacts. This cushioning approach prevents damage to the fragile piezoelectric element while preserving the thin profile.
4Length of stationary object
If piezoelectric elements are used in flexible display apparatuses, then thinness is achieved, but damage occurs due to fragile characteristic
Solution Approach 1:
The patent uses a composite structure combining the piezoelectric element with flexible display panel components and protective encapsulation layers. This composite design provides both flexibility for the display apparatus and mechanical protection for the fragile piezoelectric element, resolving the contradiction between thinness and strength.
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 proposed solution effectively enhances the sound pressure characteristic and reliability of sound reproduction in display apparatuses, allowing for the realization of a stereo sound effect while being applicable to flexible display panels.
Implementation Method 1
utilizing a piezoelectric composite layer with alternating inorganic and organic material portions to enhance sound pressure characteristics
Implementation Method 2
a vibration device on a rear surface of the display panel to vibrate the display panel to generate a sound
Data Source
AI summary
A display apparatus includes a display panel configured to display an image, and a vibration device on a rear surface of the display panel to vibrate the display panel to generate a sound, the vibration device including a vibration array including a plurality of vibration modules.