Display Panel Blocking Structure for Front-Firing Stereo Sound
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Solution Overview
Problem
Display devices output high-frequency sound towards the front and low-frequency sound towards the rear, leading to differing sound presences for the user.
Innovation Solution
Incorporating a blocking element with specific buffer layers and vibrating elements to output sound towards the front side of the display device, using the display panel as a diaphragm, and optimizing sound propagation coefficients and damping coefficients for improved sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the woofer is disposed on the rear surface of the display device to output low-frequency sound, then low-frequency sound can be outputted toward another side, but the user experiences different sound presence from high-frequency and low-frequency sound
Solution Approach 1:
The patent combines high-frequency sound generation (via display panel vibration) and low-frequency sound generation (via woofer) into a single integrated structure where both sound types are outputted toward the front side through the display panel, merging their output directions to provide consistent sound presence
Solution Approach 2:
The display panel serves as an intermediary surface that transmits both high-frequency vibrations from the sound generating device and low-frequency vibrations from the woofer toward the front side, mediating between the two different sound sources to achieve unified sound output direction
2Temperature
If the sound generating device vibrates the display panel to output sound toward the front side, then sound quality is improved, but the display panel must handle both display and sound functions
Solution Approach 1:
The display panel is designed to perform multiple functions simultaneously: it serves as both the display surface and the sound output surface, vibrating in response to both high-frequency signals from the sound generating device and low-frequency signals from the woofer to output sound toward the front side
3Temperature
If buffer layers with specific sound propagation coefficients are used to balance sound pressure, then sound quality is improved, but the device structure becomes more complex
Solution Approach 1:
The patent applies buffer layers with specifically engineered sound propagation coefficients at particular locations between the woofer and display panel to balance sound pressure in different frequency ranges, creating local acoustic optimization without redesigning the entire device structure
Solution Approach 2:
The buffer layers are designed with specific sound propagation coefficient values (C1 and C2 satisfying particular relationships) to control sound wave transmission and balance sound pressure across different frequency ranges, using parameter optimization to achieve acoustic balance
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
Enhances sound quality by balancing sound pressure across low, middle, and high-frequency ranges, allowing for stereophonic sound output from the front side without separate speakers.
Implementation Method 1
a first vibrating element disposed on a second surface of the substrate and that vibrates the display panel to output a first sound
Implementation Method 2
A first sound propagation coefficient value of the first buffer layer and a second sound propagation coefficient value of the second buffer layer satisfy the following Eq. (1)
Data Source
AI summary
A display device includes a display panel including a substrate including a first side extending in a first direction and a second side extending in a second direction intersecting the first direction, and a light emitting element layer positioned on a first surface of the substrate, a first vibrating element disposed on a second surface of the substrate and that vibrates the display panel to output a first sound, a first buffer layer disposed on the second surface of the substrate and disposed between the first side and the first vibrating element, and a second buffer layer disposed on the second surface of the substrate and disposed between the second side and the first vibrating element. The first buffer layer includes a first pore, and the second buffer layer includes a second pore.