Vibrator Length Optimization for Display Panel Sound Pressure

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Solution Overview

Problem

Large image display apparatuses with vibrators struggle to maintain sufficient sound pressure in high sound bands, leading to inadequate voice output when viewed at appropriate distances.

Innovation Solution

The image display apparatus is designed with a display panel having a specific pixel pitch and a vibrator mounted on its non-display surface, where the maximum length of the vibrator in the lateral direction is limited by the diagonal length of the display panel, ensuring sufficient sound pressure across high sound bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the display panel size is enlarged, then the display area increases, but the sound pressure in high sound bands decreases

Engineering Contradiction:

Improvedisplay panel areaVSAvoidsound pressure in high sound bands

Core Design Contradiction:

Area of stationary objectVSStress or pressure

Solution Approach 1:

The patent applies parameter changes by establishing a specific mathematical relationship between the vibrator length Lmax and the display panel diagonal length A, where Lmax ≤ (A/0.15)^(1/2). This parameter optimization ensures that as the display panel size increases, the vibrator length is proportionally adjusted to maintain sufficient sound pressure in high sound bands, resolving the contradiction between large display area and adequate sound pressure.

Inventive Principle:

Principle #35Parameter changes

2Power

If the vibrator length is increased, then the sound output capability improves, but the sound pressure in high sound bands at appropriate viewing distances decreases

Engineering Contradiction:

Improvesound output capabilityVSAvoidsound pressure at high sound bands

Core Design Contradiction:

PowerVSStress or pressure

Solution Approach 1:

The patent optimizes the vibrator length parameter by establishing the relationship Lmax ≤ (A/0.15)^(1/2), where A is the display panel diagonal length. This parameter optimization balances the sound output capability with the sound pressure in high sound bands, ensuring that even as vibrator length increases to improve sound output, the sound pressure in high sound bands is maintained at appropriate viewing distances.

Inventive Principle:

Principle #35Parameter changes

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 configuration allows for voice output with sufficient sound pressure up to high sound bands, regardless of the display panel's size and pixel pitch, effectively addressing the issue of low sound pressure in large displays.

Implementation Method 1

a vibrator mounted on a non-display surface of the display panel... the display panel is vibrated by the vibrator to output a voice

Methodology Applied

Scientific EffectVibration: Vibration

Implementation Method 2

a piezoelectric element such as a piezo element is exemplified as the vibrator

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Data Source

PatentUS20250117053A1Image display apparatus

Publication Date: 2025.04.10 FUJIFILM CORP

AI summary

An object is to provide an image display apparatus that outputs a voice by vibrating a display panel using a vibrator, in which a voice with sufficient sound pressure can be heard up to a high sound band. The object is achieved by including a display panel having a pixel pitch of 25 to 100 dpi and a vibrator mounted on a non-display surface of the display panel, in which, in a case where a length of a diagonal line of the display panel is denoted by A, a maximum length Lmax of the vibrator in a direction along a lateral direction of the display panel satisfies “Lmax≤(A/0.15)1/2”.