Display Panel Sound Generator Layout for Front-Firing Audio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display devices often locate speakers on the lower surface or one side of the display panel, resulting in sound output in the back or side direction, which deteriorates sound quality.
Innovation Solution
The display device incorporates a sound generator that vibrates the display panel using a first vibration generator with a voice coil and a second vibration generator with a piezoelectric element, both overlapping in the thickness direction to output sound in the front direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the speaker is located on the lower surface or side of the display panel, then the space restriction is satisfied, but the sound output direction becomes back or side direction which deteriorates sound quality
Solution Approach 1:
The patent combines the speaker function with the display panel by making the display panel itself serve as the speaker diaphragm. The sound generator is integrated behind the display panel, causing the panel to vibrate and produce sound in the front direction, thus merging two functions into one component and eliminating the need for a separate speaker on the lower surface or side.
Solution Approach 2:
The patent changes the spatial arrangement by placing the sound generator in the thickness direction (z-axis) behind the display panel rather than on the lower surface or side. This dimensional repositioning allows the sound to be output in the front direction while still satisfying space restrictions within the device thickness.
2Device complexity
If a single vibration generator is used, then the device complexity is reduced, but the frequency response range is limited
Solution Approach 1:
The patent segments the sound generation function into two distinct vibration generators: a first vibration generator for middle frequencies and a second vibration generator for high frequencies. Each generator is responsible for a specific frequency range, allowing the system to achieve a broader frequency response while maintaining manageable complexity through functional division.
Solution Approach 2:
The display panel serves multiple functions: it acts as both the display surface and the speaker diaphragm. Additionally, the overlapping arrangement of two vibration generators allows the same physical space to produce multiple frequency bands, enhancing the versatility of the sound output system without proportionally increasing device volume.
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 configuration improves sound quality by allowing sound to be output in the front direction, enhancing the overall audio experience.
Implementation Method 1
a first vibration generator which vibrates the display panel by generating a magnetic force using a first voice coil therein
Implementation Method 2
a second vibration generator including a vibration layer which contracts or expands based on a voltage applied thereto to vibrate the display panel
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A display device includes: a display panel including a first substrate and a light emitting element layer disposed on the first substrate; and a sound generator disposed on one surface of the first substrate, where the sound generator vibrates the display panel to output a sound. The sound generator includes: a first vibration generator which vibrates the display panel by generating a magnetic force using a first voice coil therein; and a second vibration generator including a vibration layer which contracts or expands based on a voltage applied thereto to vibrate the display panel, where the first vibration generator and the second vibration generator overlap each other in a thickness direction of the display panel.