Piezoelectric Speaker Support Venting for Low-Frequency Sound

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Piezoelectric speakers suffer from insufficient sound pressure levels in the low-pitched sound band due to high stiffness, leading to inadequate sound characteristics in this frequency range.

Innovation Solution

An apparatus is designed with a vibration member, a vibration device connected to the member, and a supporting member with internal holes that allow communication between an internal space and the external environment, reducing air pressure and enhancing sound characteristics and pressure levels in the low-pitched sound band.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If piezoelectric device with high stiffness is used, then structural integrity is improved, but sound pressure level of low-pitched sound band deteriorates

Engineering Contradiction:

Improvestructural integrityVSAvoidsound pressure level of low-pitched sound band

Core Design Contradiction:

StrengthVSQuantity of substance

Solution Approach 1:

The supporting member is divided into multiple segments with holes, creating separate air pressure zones that can move independently. This segmentation allows the rigid piezoelectric device to maintain structural integrity while the segmented air pressure distribution enhances low-frequency sound pressure by allowing localized air movement through each hole.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Air pressure acts as an intermediary between the rigid piezoelectric device and the external environment. The holes in the supporting member allow air pressure to mediate the interaction, translating the high-stiffness vibrations into enhanced low-pitched sound waves while maintaining the structural integrity of the piezoelectric device.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Stability of the object's composition

If closed internal space is provided, then structural stability is improved, but sound characteristic of low-pitched sound band deteriorates

Engineering Contradiction:

Improvestructural stabilityVSAvoidsound characteristic of low-pitched sound band

Core Design Contradiction:

Stability of the object's compositionVSQuantity of substance

Solution Approach 1:

The supporting member incorporates a porous structure with multiple holes, transforming the completely closed internal space into a partially open system. This porous configuration maintains structural stability while allowing air pressure equalization that enhances low-pitched sound characteristics by enabling controlled air movement through the supporting member.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

Different regions of the supporting member have different properties - the overall structure maintains structural stability while localized holes provide air pressure release pathways. This local quality differentiation allows the system to simultaneously achieve structural stability and improved low-pitched sound characteristics through spatially varying functionality.

Inventive Principle:

Principle #3Local quality

3Quantity of substance

If air pressure in internal space is reduced, then sound pressure level of low-pitched sound band is improved, but air pressure imbalance harmful factor increases

Engineering Contradiction:

Improvesound pressure level of low-pitched sound bandVSAvoidair pressure imbalance

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The holes in the supporting member are pre-configured to allow air pressure equalization before significant pressure imbalance can occur. This preliminary action prevents harmful air pressure buildup by providing continuous pressure relief pathways, thereby maintaining improved sound pressure levels without introducing harmful air pressure imbalance effects.

Inventive Principle:

Principle #10Preliminary action

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 apparatus effectively increases sound pressure levels and improves sound characteristics in the low-pitched sound band by allowing air pressure equalization through the holes in the supporting member, enabling sound output in both directions.

Implementation Method 1

an internal space provided between a supporting member and a vibration member may communicate with an external space through a plurality of holes provided in the supporting member, and thus, an air pressure of the internal space may decrease

Methodology Applied

Scientific EffectAir pressure equalization: Pressure Gradient

Implementation Method 2

Piezoelectric speakers including a piezoelectric device is lightweight and has low power consumption

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Data Source

PatentUS12464288B2Apparatus

Publication Date: 2025.11.04 LG DISPLAY CO LTD

AI summary

An apparatus includes a vibration member, a vibration device connected with the vibration member, a supporting member at a rear surface of the vibration member and configured to include an internal space, and a plurality of holes configured at the supporting member. In another aspect, an apparatus includes a vibration member, a vibration device connected with the vibration member, and a housing covering a rear surface of the vibration member and including a plurality of holes, wherein an internal space provided by the vibration member and the housing is connected to an external space of the housing through the plurality of holes.