Mobile Terminal Magnet Arrangement for Sound on Display

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing sound on display technologies in mobile terminals suffer from insufficient push force of vibration sounding modules, resulting in low sound generation and poor sound quality due to insufficient driving force for the screen.

Innovation Solution

A mobile terminal design incorporating a first magnet and a second magnet, where the first magnet is a coil or a main magnet, and the second magnet is a Halbach array, generating a unilateral magnetic field to drive the display module to vibrate at a high frequency, enhancing sound generation without the need for sound outlet holes, thereby improving the sound on display effect.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If a vibration sounding module is used to drive the screen for sound on display, then the screen-to-body ratio is improved and sound outlet holes are eliminated, but the push force of the vibration module is insufficient resulting in low sound generation

Engineering Contradiction:

Improvepush force of vibration sounding moduleVSAvoidsound generation capability

Core Design Contradiction:

ForceVSPower

Solution Approach 1:

The vibration sounding module is segmented into two independent parts: a first magnet (coil) disposed on the back facet of the display module and a second magnet (main magnet) disposed on the middle frame. This segmentation allows each magnet to be optimized independently for its specific function, with the first magnet generating strong magnetic fields for vibration drive and the second magnet providing stable magnetic field for interaction, thereby resolving the insufficient push force problem while maintaining the sound on display functionality without sound outlet holes

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The display module itself serves as an intermediary element that transmits vibration from the first magnet to the air. The first magnet drives the display module to vibrate at high frequency with small amplitude, and this vibration is transmitted through the display module to generate sound waves in the air, eliminating the need for separate sound outlet holes while achieving effective sound generation

Inventive Principle:

Principle #24Intermediary (Mediator)

2Speed

If the first magnet drives the display module to vibrate at high frequency, then sound on display effect is improved, but the vibration amplitude becomes small

Engineering Contradiction:

Improvevibration frequency of display moduleVSAvoidvibration amplitude of display module

Core Design Contradiction:

SpeedVSLength of moving object

Solution Approach 1:

The system utilizes mechanical vibration principles by driving the display module to vibrate at high frequency through the interaction of magnetic fields from the first and second magnets. The first magnet generates a magnetic field that interacts with the second magnet to produce oscillating forces, causing the display module to vibrate. This high-frequency vibration directly generates sound waves in the air, achieving effective sound on display without requiring large amplitude movements

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

The solution significantly increases the vibration intensity of the display module, leading to higher sound quality and improved sound on display performance while maintaining a flat and rounded display surface without the need for sound outlet holes.

Implementation Method 1

there is an interaction force between a magnetic field generated by the first magnet and a magnetic field generated by the second magnet. Under the action of the magnetic field generated by the first magnet and the magnetic field generated by the second magnet, the first magnet may vibrate in a direction perpendicular to a light-emitting surface of the display module

Methodology Applied

Scientific EffectElectromagnetic interaction: Lorentz Force

Implementation Method 2

The main magnet is a Halbach array, and the main magnet generates a unilateral magnetic field on a side opposite to the coil

Methodology Applied

Scientific EffectHalbach array magnetic field generation: Halbach Array

Implementation Method 3

the first magnet drives the display module to move up and down at a small amplitude and a high frequency relative to the middle frame. Driven by the first magnet, the display module, as a diaphragm, pushes air to generate sound in a vibration process

Methodology Applied

Scientific EffectVibration-induced sound generation: Vibration

Data Source

PatentUS12058506B2Mobile terminal

Publication Date: 2024.08.06 HUAWEI TECH CO LTD

AI summary

This application provides a mobile terminal including a first magnet and a second magnet. At least a part of the first magnet and at least a part of the second magnet are disposed in the accommodating space. The first magnet is disposed on a back facet of the display module, the second magnet is disposed on the middle frame, and positions of the first magnet and the second magnet are disposed opposite to each other. The first magnet is a coil, and the second magnet is a main magnet; or the first magnet is a main magnet, and the second magnet is a coil. The main magnet is a Halbach array, and the main magnet generates a unilateral magnetic field on a side opposite to the coil.