Piezoelectric Vibration Module for Display Sound Quality
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Solution Overview
Problem
Conventional display apparatuses face challenges in maintaining accurate sound transmission due to sound interference with walls or ground, leading to deteriorated sound quality, and piezoelectric devices used for sound generation are prone to damage and increased thickness.
Innovation Solution
A display apparatus with a vibration module incorporating a piezoelectric composite layer featuring sub-modules with specific arrangement directions of first and second portions, which enhances sound pressure flatness and expands the reproduction frequency band by adjusting resonance frequencies using a plate between the display panel and vibration modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a piezoelectric device is used for sound generation to reduce thickness, then the thickness of the display apparatus is reduced, but the device becomes easily damaged by external force due to brittle properties
Solution Approach 1:
The patent applies composite materials by combining the piezoelectric layer with a flexible substrate and protective layers. The piezoelectric layer is deposited on a flexible polymer substrate that provides mechanical support and resistance to external forces, while the composite structure maintains the thin profile needed for slim display design. This resolves the contradiction by integrating the brittle piezoelectric material into a resilient composite system.
Solution Approach 2:
The patent uses flexible thin films as the substrate for the piezoelectric layer, allowing the device to bend and absorb external forces without breaking. The flexible substrate acts as a protective shell that prevents the brittle piezoelectric material from direct exposure to mechanical stress, thereby improving reliability while maintaining thinness.
2Device complexity
If sound device output is directed to rear side or lower side of display panel, then the display apparatus structure is simplified, but sound quality deteriorates due to interference with sound reflected on wall or ground
Solution Approach 1:
The patent directs sound waves at an angle rather than straight forward, using inclined sound outlets positioned at the bottom edges of the display panel. This angular redirection in a different spatial dimension allows sound to bypass reflected waves from walls and ground, improving sound quality without significantly complicating the overall device structure.
Solution Approach 2:
The patent introduces an acoustic waveguide or reflection panel as an intermediary element that channels sound waves from the rear-side sound outlets in a controlled manner. This intermediary structure directs sound at optimal angles to avoid interference from environmental reflections, resolving the contradiction between simplified structure and sound quality.
3Reliability
If piezoelectric material arrangement is optimized to expand reproduction frequency band and improve sound pressure flatness, then sound quality is improved, but device complexity increases
Solution Approach 1:
The patent segments the piezoelectric layer into multiple independent piezoelectric elements arranged in specific patterns. Each element can be independently controlled to generate different frequency components, enabling expansion of the reproduction frequency band and improvement of sound pressure flatness. This segmentation allows complex sound quality optimization without requiring a completely complex device architecture.
Solution Approach 2:
The patent applies local quality by varying the arrangement, orientation, and properties of piezoelectric elements in different regions of the display panel. Specific areas have optimized piezoelectric material orientation to enhance low-pitched sound reproduction, while other regions are configured for different frequency ranges. This localized optimization improves overall sound quality without uniformly 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
The solution improves sound pressure flatness and expands the reproduction frequency band, particularly for low-pitched sounds, while maintaining a slim design and enhancing durability by absorbing external forces, thus providing better sound quality and reliability.
Implementation Method 1
A display apparatus with a vibration module incorporating a piezoelectric composite layer featuring sub-modules with specific arrangement directions of first and second portions
Implementation Method 2
expands the reproduction frequency band, particularly for low-pitched sounds, while maintaining a slim design and enhancing durability by absorbing external forces
Data Source
AI summary
A display apparatus includes: a display panel configured to display an image, and at least one vibration module on a rear surface of the display panel, the at least one vibration module including a piezoelectric composite layer including a plurality of sub-modules configured to vibrate the display panel, each of the plurality of sub-modules including: a plurality of first portions including a piezoelectric characteristic, and a plurality of second portions having flexibility, each of the plurality of second portions being between a respective pair of the plurality first portions, wherein the plurality of first portions in the respective sub-modules are arranged in a same direction or are partially arranged in different directions.