Display Panel Vibration Sound Generation for Thin Apparatuses
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Solution Overview
Problem
Conventional speakers for thin display apparatuses, such as micro speakers and piezo ceramic speakers, face challenges in miniaturization, durability, thickness reduction, and sound quality, particularly in producing low-pitched sounds.
Innovation Solution
A display apparatus with a sound generator that includes a magnetic circuit unit and a voice coil unit on the rear surface of the display panel, which vibrates the panel to generate sound, allowing for miniaturization and enhanced sound quality, including both middle-high and low-pitched sound bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If piezo ceramic speakers are used in thin display apparatuses, then the response time is fast and frequency range is broad, but the durability is low and thickness reduction is difficult
Solution Approach 1:
The patent replaces the piezo ceramic mechanical vibration system with an electromagnetic driving system consisting of a voice coil and magnetic circuit. This substitution maintains fast response characteristics while significantly improving durability by eliminating the fragile piezo ceramic material that is prone to breaking under external impact.
Solution Approach 2:
The patent changes the driving mechanism from piezoelectric effect to electromagnetic induction, fundamentally altering the physical principle while maintaining the ability to achieve fast response. The electromagnetic system allows for optimized parameters such as coil wire diameter, turn density, and magnetic circuit design to achieve both speed and durability requirements.
2Volume of moving object
If piezo ceramic speakers are disposed on the rear surface, then the structure is compact, but the whole portion of the display apparatus vibrates
Solution Approach 1:
The patent applies local quality by designing a localized vibration control structure where a damping layer is positioned specifically between the voice coil assembly and the rear cover. This localized intervention prevents vibration from propagating to the entire display apparatus while maintaining the compact rear-surface mounting configuration.
3Length of stationary object
If the display apparatus thickness is reduced, then the device is slimmer, but the sound generator space is limited
Solution Approach 1:
The patent utilizes the vertical dimension efficiently by stacking the magnetic circuit and voice coil unit in a compact arrangement between the display panel and rear cover. The magnetic circuit is positioned with its north and south poles facing each other, creating a concentrated magnetic field zone that maximizes the acoustic output within the limited thickness space.
Solution Approach 2:
The patent employs a nested arrangement where the voice coil is positioned within the magnetic circuit's magnetic field region, and the vibration plate is integrated with the voice coil assembly. This nested configuration allows the sound generator components to be tightly packed, achieving high acoustic performance within minimal thickness.
4Volume of moving object
If conventional speakers are miniaturized, then the display apparatus can be thinner, but the sound quality deteriorates
Solution Approach 1:
The patent employs composite material strategies in the vibration plate design, using materials with optimized density and elastic properties to maintain acoustic performance in a miniaturized configuration. The magnetic circuit also utilizes composite construction with ferrite magnets and magnetic conductive materials to maximize field strength within the limited space, thereby preserving sound quality despite reduced overall size.
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 enables a slim, durable, and high-quality sound output in thin display apparatuses, overcoming the limitations of existing speakers by effectively miniaturizing the sound generator and improving sound frequency range.
Implementation Method 1
a voice coil unit on the rear surface of the display panel, wherein the magnetic circuit unit and the voice coil unit vibrate the display panel to generate sound
Data Source
AI summary
A display apparatus includes a display panel configured to display an image by emitting light, a supporting member on a rear surface of the display panel, and a sound generator between the display panel and the supporting member. The sound generator includes a magnetic circuit unit and a voice coil unit on the rear surface of the display panel, and the magnetic circuit unit and the voice coil unit are configured to vibrate the display panel to generate sound.