Vibration-Based Sound Output System for Display Panels

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Solution Overview

Problem

Conventional devices with integrated speakers face challenges in sound quality due to sound interference from walls and floors, leading to reduced immersion and accuracy in sound transmission.

Innovation Solution

A vibration-based sound output system that includes a vibration member, a supporting member, and both piezoelectric and coil-type vibration generating apparatuses connected in series, which enhance sound characteristics and pressure levels by directing sound forward and optimizing internal space usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a speaker is provided in a display apparatus, then sound can be output, but the speaker consumes space and limits the design and space arrangement of the apparatus

Engineering Contradiction:

Improvespace utilizationVSAvoidsound quality

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent replaces the conventional electromagnetic speaker system with a piezoelectric-based sound generation system. The piezoelectric element converts electrical signals directly to mechanical vibrations of the display panel, eliminating the need for separate speaker components and improving space utilization while maintaining sound output capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The display panel serves dual functions: as the display surface and as the vibration element for sound generation. By making the display panel itself capable of producing sound through piezoelectric effects, the system combines two functions (display and audio output) into a single component, reducing overall device complexity and space requirements.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If sound is output from the speaker in a display apparatus, then sound can be heard, but sound quality is degraded due to interference between sounds reflected from walls and the ground

Engineering Contradiction:

Improvesound transmission accuracyVSAvoidsound interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Instead of attempting to block or absorb reflected sounds from walls and ground, the patent inverts the approach by directing sound waves to travel along the display panel surface. This causes reflected sounds to return to the source rather than propagate forward to interfere with the listener, effectively canceling out harmful reflections through reverse direction propagation.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The display panel acts as an intermediary medium for sound transmission. By using the panel itself as the sound propagation path rather than traditional air-based acoustic transmission, the system creates a controlled medium that prevents external reflections from interfering with the audio signal reaching the viewer.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Volume of stationary object

If a coil type vibration apparatus and a piezoelectric type vibration apparatus are integrated in a stack structure, then the gap interval of internal space is reduced, but the device complexity increases

Engineering Contradiction:

Improveinternal space gapVSAvoidstack structure integration

Core Design Contradiction:

Volume of stationary objectVSDevice complexity

Solution Approach 1:

The patent merges the coil-type vibration apparatus and piezoelectric-type vibration apparatus into a single integrated stack structure. By combining these two different vibration generation mechanisms in close proximity, the system reduces the overall gap interval and internal space requirements while achieving comprehensive frequency range coverage through the complementary characteristics of both apparatus types.

Inventive Principle:

Principle #5Merging (Combining)

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 system improves sound quality and pressure levels by effectively directing sound forward, reducing interference, and simplifying the sound processing circuit while lowering manufacturing costs and enhancing productivity and reliability.

Implementation Method 1

a first vibration generating apparatus (200) connected with a rear surface of the vibration member (100), wherein the first vibration generating apparatus (200) includes a piezoelectric element

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

a second vibration generating apparatus (200') between the vibration member (100) and the supporting member (300), wherein the second vibration generating apparatus (200') includes a coil element

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 3

a vibration member (100), a supporting member (300) at a rear surface of the vibration member (100)

Methodology Applied

Scientific EffectMechanical vibration: Vibration

Data Source

PatentUS20240214727A1apparatus

Publication Date: 2024.06.27 LG DISPLAY CO LTD

AI summary

An apparatus includes a vibration member, a supporting member at a rear surface of the vibration member, a first vibration generating apparatus connected with the rear surface of the vibration member, and a second vibration generating apparatus between the vibration member and the supporting member, wherein the first vibration generating apparatus and the second vibration generating apparatus are serially connected with each other.