Display Module Sound Generation via Electromagnetic Vibration
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Solution Overview
Problem
Current full-screen display systems in electronic devices rely on piezoelectric materials or linear vibration motors, which are costly and occupy significant internal space, hindering miniaturization due to high costs and impracticality of piezoelectric materials and the space requirements of linear vibration motors.
Innovation Solution
A display module incorporating a magnet and a coil with alternating current (AC) signal-driven magnetic attraction and repulsion to vibrate the display screen, where the magnet is partially accommodated within the coil's space, reducing overall size while maintaining effective sound generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If piezoelectric materials are used to produce sound, then sound generation is achieved, but cost increases and practicability decreases
Solution Approach 1:
The patent replaces expensive piezoelectric materials with a cost-effective electromagnetic vibration system consisting of a coil and magnet, achieving sound generation through AC-driven magnetic attraction and repulsion without requiring costly piezoelectric components
Solution Approach 2:
The patent substitutes the piezoelectric mechanical system with an electromagnetic system, using magnetic field interactions between a coil and magnet to produce vibrations that generate sound, thereby eliminating the need for piezoelectric materials
2Reliability
If linear vibration motors are used to produce sound, then sound generation is achieved, but internal space occupation increases
Solution Approach 1:
The patent merges the sound generation function with the existing display screen structure, using the display screen itself as the vibration surface. The coil and magnet are integrated into the display module, eliminating the need for separate linear vibration motors and reducing internal space occupation
Solution Approach 2:
The display screen serves dual functions: visual display and sound generation through vibration. The coil and magnet assembly is designed to work within the existing display module structure, making the system multi-functional and space-efficient
3Reliability
If IC amplifiers are added for sound output, then sound quality improves, but device cost increases
Solution Approach 1:
The patent eliminates the need for additional IC amplifiers by designing a vibration system that can be directly driven by AC signals from the existing power supply, removing the requirement for expensive audio amplifier components
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 solution reduces the size and cost of electronic devices by utilizing AC-driven magnetic interactions to produce sound, minimizing space occupation and eliminating the need for expensive piezoelectric materials and additional IC amplifiers.
Implementation Method 1
A display module incorporating a magnet and a coil with alternating current (AC) signal-driven magnetic attraction and repulsion to vibrate the display screen
Implementation Method 2
AC-driven magnetic interactions to produce sound, minimizing space occupation
Data Source
AI summary
A display module includes a middle frame, a display screen, a coil, and a magnet. The display screen is arranged on the middle frame. The display screen and the middle frame cooperatively define a receiving space. The coil defines an accommodation space. A portion of the magnet is accommodated in the accommodation space. The magnet and the coil are received in the receiving space. One of the magnet and the coil is arranged on the display screen, and the other one of the magnet and the coil is arranged on the middle frame.