Piezoelectric Display Panel Audio for Thin, Impact-Resistant Screens
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Solution Overview
Problem
Display apparatuses face challenges with speakers occupying space, limiting design and spatial disposition, and piezoelectric elements being fragile and difficult to output desired sounds without increasing thickness.
Innovation Solution
A display apparatus with vibration generating devices on the rear surface of the display panel, utilizing piezoelectric and expansion portions with different expansion coefficients to vibrate the panel and generate sound, reducing heat and maintaining thinness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a speaker is disposed in a display apparatus, then sound reproduction is provided, 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 using piezoelectric elements integrated into the panel structure. The vibration generating device is formed by combining piezoelectric portions and expansion portions in a single integrated structure that vibrates the display panel to generate sound, eliminating the need for a separate speaker component.
Solution Approach 2:
The display panel serves dual functions: visual display and sound generation. The piezoelectric elements in the panel can be driven to vibrate the panel structure and generate sound waves, allowing the same component to perform both display and audio functions without requiring additional dedicated speaker hardware.
2Reliability
If an actuator including magnet and coil is applied, then sound is provided, but the thickness becomes thick
Solution Approach 1:
The patent replaces the traditional electromagnetic actuator system (magnet and coil) with a piezoelectric-based mechanical system. The piezoelectric elements convert electrical signals directly into mechanical vibrations through the piezoelectric effect, eliminating the need for magnetic components and coils, thereby reducing thickness.
Solution Approach 2:
The patent changes the operating principle from electromagnetic actuation to piezoelectric actuation. By using piezoelectric materials that respond directly to electrical signals through mechanical stress, the system achieves sound generation with significantly reduced thickness compared to traditional electromagnetic actuators.
3Length of stationary object
If piezoelectric elements are used to achieve thinness, then thickness is reduced, but the elements are easily damaged by external impact and reliability is low
Solution Approach 1:
The patent uses a composite structure combining piezoelectric portions and expansion portions. The expansion portions are designed to have different expansion coefficients than the piezoelectric portions, creating a composite structure where the expansion portions can compensate for mechanical stress and protect the fragile piezoelectric elements from damage by external impact.
Solution Approach 2:
The expansion portions are designed beforehand to provide cushioning and stress compensation for the piezoelectric elements. When external impact occurs, the expansion portions can deform to absorb and distribute the mechanical stress, protecting the fragile piezoelectric elements from direct damage before the impact can affect them.
4Length of stationary object
If piezoelectric element is configured as one layer for different frequencies, then thickness is maintained thin, but it is difficult to output desired sound
Solution Approach 1:
The patent applies local quality by creating different regions within the one-layer structure. The piezoelectric portions and expansion portions are arranged in specific patterns and configurations that allow different frequency characteristics to be generated from the same thin structure. The local arrangement of these portions enables frequency differentiation without increasing overall thickness.
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
Enhances sound quality and localization while minimizing thickness and heat generation, suitable for flexible display applications.
Implementation Method 1
each of the plurality of vibration generating devices includes a plurality of first portions having a piezoelectric characteristic
Implementation Method 2
a plurality of second portions disposed near the plurality of first portions to have an expansion coefficient
Data Source
AI summary
A display apparatus includes a display panel configured to display an image, a film actuator configured to vibrate the display panel, and a partition configured to surround the film actuator. The film actuator may include a plurality of vibration generating devices configured with a composite film. The plurality of vibration generating devices may be configured to have different expansion coefficients. The composite film may include a plurality of vibration portions configured to have a piezoelectric characteristic and a plurality of expansion portions configured to have flexibility and overlap with the plurality of vibration portions.