Display Panel Speaker Coupling for Higher Sound Pressure

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Solution Overview

Problem

Display devices that use a display panel as a speaker often suffer from inadequate sound quality due to insufficient sound pressure and resonance-related noise.

Innovation Solution

Incorporating a piezoelectric element vibrated by audio signals, connected to the display panel via an elastic member, which transmits vibrations to enhance sound pressure and reduce resonance noise, with configurations such as bimorph or unimorph structures and multiple vibration parts to improve sound quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a display panel is allowed to function as a speaker through direct actuator control, then the display device can emit sound, but sound quality is insufficient

Engineering Contradiction:

Improvesound emission capabilityVSAvoidsound quality

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces an elastic member as an intermediary between the piezoelectric actuator and the display panel. This elastic member effectively transmits vibrations from the piezoelectric element to the display panel, improving sound quality while maintaining the versatility of sound emission capability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If sound is emitted from display panel, then display device functions as speaker, but sound pressure is insufficient

Engineering Contradiction:

Improvespeaker functionVSAvoidsound pressure

Core Design Contradiction:

Adaptability or versatilityVSStress or pressure

Solution Approach 1:

The patent utilizes mechanical vibration principles by employing a piezoelectric element that vibrates according to input audio signals. The elastic member transmits these vibrations to the display panel, effectively increasing sound pressure while maintaining the speaker function.

Inventive Principle:

Principle #18Mechanical vibration

3Adaptability or versatility

If display panel vibrates to emit sound, then sound can be produced, but resonance-related noise increases

Engineering Contradiction:

Improvesound production capabilityVSAvoidresonance noise

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The elastic member serves as a mediator that transmits vibrations from the piezoelectric element to the display panel while filtering out resonance-related noise. This allows sound production capability to be maintained while reducing harmful resonance effects.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 significantly improves sound pressure and reduces resonance-induced noise, resulting in enhanced sound quality for display devices that function as speakers.

Implementation Method 1

a piezoelectric element vibrated according to input audio signals

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

an elastic member configured to connect a portion of the piezoelectric element and the display panel so as to transmit a vibration of the piezoelectric element to the display panel

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS11902739B2Display device for generating sound from display panel

Publication Date: 2024.02.13 LG DISPLAY CO LTD

AI summary

A display device includes a piezoelectric element vibrated according to input audio signals, a display panel configured to display an image, and an elastic member configured to connect a portion of the piezoelectric element and the display panel so as to transmit a vibration of the piezoelectric element to the display panel to improve sound quality in a display device which emits a sound from a display panel.