Vibration Sensor Sound Inspection for Display Devices

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Solution Overview

Problem

Existing sound inspection methods for display devices with sound generators are unreliable due to external noise interference, making it difficult to accurately assess sound quality.

Innovation Solution

A method and device that utilize a vibration sensor to detect vibrations of a display panel driven by a sound generator, comparing the frequency and amplitude of these vibrations to threshold regions to determine the sound generator's performance, independent of external noise, using a vibration sensing unit and determination unit to classify the device as good or defective.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a microphone is used to capture sound output for inspection, then sound quality can be assessed, but external noise interference reduces reliability

Engineering Contradiction:

Improvesound quality assessment accuracyVSAvoidinspection reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent replaces the acoustic measurement system (microphone capturing sound waves) with a vibration sensing system. The vibration sensor directly detects mechanical vibrations of the display panel caused by the sound generator, converting acoustic inspection into mechanical vibration inspection. This substitution eliminates the intermediate step of sound wave propagation through air, thereby removing external noise interference and improving both measurement precision and reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The display panel itself serves as an intermediary medium between the sound generator and the sensor. Instead of using air as the transmission medium (which carries external noise), the vibration sensor detects vibrations transmitted through the solid display panel structure. This intermediary approach filters out external acoustic noise while preserving the characteristic vibrations generated by the sound generator.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If noise shielding measures are implemented to block external noise, then inspection reliability improves, but device complexity and cost increase

Engineering Contradiction:

Improveinspection reliabilityVSAvoidinspection system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent eliminates the need for noise shielding structures by replacing the acoustic measurement approach with direct vibration sensing. This fundamental measurement method change removes the requirement for creating acoustically isolated environments, thereby reducing device complexity while maintaining or improving reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent extracts the vibration detection function directly from the acoustic measurement system. By taking out the essential measurement objective (detecting sound generator output) and实现ing it through a different physical pathway (vibration sensing instead of acoustic sensing), the system removes the need for noise shielding infrastructure.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If vibration sensing is used to detect sound generator vibrations, then external noise interference is eliminated, but measurement of sound quality becomes indirect

Engineering Contradiction:

Improveinspection reliabilityVSAvoidsound quality measurement accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent utilizes mechanical vibration as the measurement basis. The sound generator causes the display panel to vibrate mechanically, and the vibration sensor detects these mechanical oscillations. By analyzing the frequency and amplitude characteristics of these vibrations, the system accurately assesses sound generator performance. This direct mechanical vibration measurement is actually more precise than acoustic measurement because it eliminates noise interference and measures the source directly rather than the propagated sound waves.

Inventive Principle:

Principle #18Mechanical vibration

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

This approach allows for reliable sound inspections by isolating the sound generator's vibrations from external noise, eliminating the need for noise shielding and reducing costs, while ensuring accurate identification of defective products.

Implementation Method 1

sensing a vibration of a vibration sensor that vibrates along with a vibration of the display panel

Methodology Applied

Scientific EffectVibration sensing: Vibration

Data Source

PatentUS11709094B2Sound inspection method and inspection apparatus for display device including sound generator

Publication Date: 2023.07.25 SAMSUNG DISPLAY CO LTD

AI summary

A sound inspection method of a display device and a sound inspection device including preparing a display device including a display panel and a sound generator disposed on a first surface of the display panel, placing a vibration sensor on a second surface opposite to the first surface of the display panel, vibrating the sound generator at a first reference frequency, vibrating the display panel, and then sensing a vibration of the vibration sensor that vibrates along with a vibration of the display panel; and determining whether a frequency of the vibration of the vibration sensor is included in a first threshold frequency region.