Display Panel Vibration Sound Generation for Forward Audio
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Solution Overview
Problem
Display apparatuses face challenges in weight-lightening and slimming while maintaining sound quality, as embedded sound devices often direct sound rearward or sideward, hindering the viewer's immersion experience.
Innovation Solution
A display apparatus with a sound generating device on its rear surface, comprising a first vibration generating device and a second vibration generating device, where the first device vibrates the center region and the second device vibrates the periphery of the display panel, ensuring sound is directed forward, enhancing sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sound device is embedded into the display apparatus, then sound output capability is provided, but the direction of sound output is rearward or sideward which hinders viewer immersion
Solution Approach 1:
The patent inverts the conventional sound output direction by using the display panel itself as a vibration source that radiates sound forward toward the viewer, rather than using separate speakers that output sound rearward or sideward. This is achieved by driving the display panel to vibrate in response to audio signals, making the panel itself the sound source and thereby directing sound in the opposite direction of traditional embedded speakers.
2Weight of stationary object
If the display apparatus is made thinner and lighter, then portability and aesthetics are improved, but sufficient space for embedding sound devices is reduced
Solution Approach 1:
The patent makes the display panel serve multiple functions: it continues to display images while simultaneously functioning as a sound generation device. By driving the panel to vibrate in response to audio signals, the same component performs both visual display and acoustic output, eliminating the need for separate speaker units and thereby enabling thinner and lighter design.
Solution Approach 2:
The patent merges the sound generation function with the display panel structure. Instead of embedding separate sound devices within the display apparatus, the display panel itself is driven to vibrate and generate sound, combining two functions (display and sound output) into a single component and thereby reducing overall device thickness and weight.
3Device complexity
If a single vibration generating device is used, then device complexity is reduced, but sound pressure level in both low and high frequency domains cannot be maximized
Solution Approach 1:
The patent segments the sound generation function into multiple vibration generating devices that operate at different locations on the display panel. By placing vibration generators at specific positions (e.g., corners or edges), each device can optimally excite different frequency ranges, with the combined effect maximizing sound pressure levels across both low and high frequency domains while maintaining manageable system 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
The solution effectively directs sound towards the viewer, improving sound quality by maximizing sound pressure levels in both low and high frequency domains, thereby enhancing the immersion experience.
Implementation Method 1
the first vibration generating device is configured to vibrate a center region of the first sound generating device
Implementation Method 2
the second vibration generating device is configured to vibrate a periphery of the display panel
Implementation Method 3
a traveling direction of a sound becomes a direction toward a front surface of the display panel
Data Source
AI summary
A display apparatus includes a display module including a display panel configured to display an image and a first sound generating device on a rear surface of the display panel, the first sound generating device including a first vibration generating device and a second vibration generating device adjacent to the first vibration generating device, the first vibration generating device is configured to vibrate a center region of the first sound generating device based on a signal applied to the first sound generating device, and the second vibration generating device is configured to vibrate a periphery of the display panel based on the applied signal.