Piezoelectric Vibration Speaker Pad for Forward Sound Output

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Solution Overview

Problem

Existing display apparatuses with integrated speakers face challenges in directing sound forward, resulting in poor sound immersion for viewers due to sound being output in rearward or lateral directions.

Innovation Solution

An apparatus comprising a vibration member and a vibration apparatus with a pad member at its rear surface, designed to enhance sound characteristics and sound pressure level by vibrating the vibration member to generate sound and output it in a forward direction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If a traditional actuator with magnet and coil is used, then the speaker can generate sound, but the thickness of the apparatus is thickened

Engineering Contradiction:

Improvesound generation capabilityVSAvoidthickness

Core Design Contradiction:

PowerVSLength of moving object

Solution Approach 1:

The patent replaces the traditional electromagnetic actuator (magnet and coil) with a piezoelectric actuator that uses piezoelectric effect to convert electrical energy directly into mechanical vibration. This substitution eliminates the need for bulky magnets and coils, achieving thin-profile sound generation while maintaining adequate acoustic output capability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If the speaker is embedded in the apparatus, then the design space is occupied, but the sound is output in rearward or lateral direction instead of forward direction

Engineering Contradiction:

Improveintegration capabilityVSAvoidsound direction control

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent introduces a sound reflection plate positioned at the rear of the piezoelectric speaker to reflect sound waves that would otherwise propagate backward or laterally. By redirecting these sound waves forward through reflection, the system achieves forward-directed sound output while maintaining the embedded configuration, effectively utilizing the rearward dimension to improve forward acoustic performance

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 enhances the sound quality and sound pressure level of the middle-high-pitched sound band, improving the overall sound immersion experience for viewers.

Implementation Method 1

piezoelectric devices for realizing a thin thickness are attracting much attention

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

a vibration apparatus configured to vibrate the vibration member, the vibration apparatus including a long side and a short side

Methodology Applied

Scientific EffectMechanical vibration: Vibration

Implementation Method 3

a pad member connected to a rear surface of the vibration apparatus. The pad member may comprise a line shape which is parallel to a long-side length direction of the vibration apparatus, or is inclined from the long-side length direction of the vibration apparatus

Methodology Applied

Scientific EffectAcoustic reflection: Reflection

Data Source

PatentUS20250048036A1apparatus

Publication Date: 2025.02.06 LG DISPLAY CO LTD

AI summary

An apparatus includes a vibration member, a vibration apparatus configured to vibrate the vibration member, the vibration apparatus including a long side and a short side, and a pad member connected to a rear surface of the vibration apparatus, wherein the pad member includes a line shape which is parallel to a long-side length direction of the vibration apparatus, or is inclined from the long-side length direction of the vibration apparatus.