LCD Panel Acoustic Structure Using Sealed Air Cavity Coupling
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Solution Overview
Problem
Liquid crystal display (LCD) panels face challenges in emitting sound due to the presence of a backlight source that interferes with sound-emitting exciters, leading to poor audio-visual synchronization and sound-image positioning issues.
Innovation Solution
A display apparatus design that includes a liquid crystal display panel with a first sealed air cavity and a backlight module forming a second sealed air cavity, where a sound-emitting board and exciter are positioned away from the panel, allowing the exciter to vibrate the backlight module, which in turn vibrates the panel to emit sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sound-emitting exciter is mounted directly on the LCD panel, then sound emission is achieved, but the backlight source interferes with the exciter operation and prevents effective vibration transmission
Solution Approach 1:
The patent introduces a sound-emitting board as an intermediary component between the sound-emitting exciter and the LCD panel. The exciter is mounted on the sound-emitting board rather than directly on the panel, allowing the exciter to vibrate the board which then transmits vibrations to the panel through the sealed air cavity. This intermediary structure resolves the interference problem by decoupling the exciter from the backlight source while maintaining sound transmission capability.
2Productivity
If the exciter is positioned close to the panel for effective vibration transmission, then sound emission efficiency improves, but the distance from the backlight source prevents effective vibration coupling
Solution Approach 1:
The patent utilizes the sealed air cavity between the LCD panel and backlight module as a pneumatic coupling medium. The air cavity allows vibration energy to be transmitted from the sound-emitting board to the LCD panel through air pressure changes, enabling effective vibration coupling despite the physical distance caused by the backlight module's position. This pneumatic transmission mechanism overcomes the limitation of direct mechanical contact being blocked by the backlight source.
3Reliability
If the LCD panel structure is modified to accommodate sound emission, then audio-visual synchronization is achieved, but the complex layered structure of LCD panels creates manufacturing difficulties
Solution Approach 1:
The patent segments the sound emission function from the display function by introducing a separate sound-emitting board and exciter assembly. Rather than modifying the complex LCD panel structure itself, the sound emission system is implemented as a distinct module that interacts with the panel through the sealed air cavity. This segmentation approach maintains the integrity of the LCD panel's layered structure while adding sound emission capability, significantly reducing manufacturing complexity.
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
Enables sound emission from the LCD panel, providing audio-visual synchronization and overcoming the industrial bottleneck of sound emission in LCD panels.
Implementation Method 1
the sound-emitting exciter is configured to excite, through the vibration output terminal, the sound-emitting board to vibrate to drive the backlight module to vibrate
Implementation Method 2
a vibration output terminal of the sound-emitting exciter is fixed to a surface, far away from the backlight module, of the sound-emitting board
Data Source
AI summary
A display apparatus includes a liquid crystal display panel and a backlight module, a first sealed air cavity formed inside the liquid crystal display panel, and the backlight module being located on one side of the liquid crystal display panel and forming a second sealed air cavity with the liquid crystal display panel; and a sound-emitting board and a sound-emitting exciter, the sound producing board being fixed to the surface of the backlight module far away from the liquid crystal display panel, and a vibration output terminal of the sound-emitting exciter being fixed to the surface of the sound-emitting board far away from the backlight module.