Display Panel Vibration Control via Internal Pressure Relief
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Solution Overview
Problem
Display apparatuses with piezoelectric elements struggle to produce high-quality low-pitched sound due to increased internal air pressure, which limits the reproduction band of low-pitched sound bands.
Innovation Solution
A display apparatus design featuring a vibration generating device and a supporting member with a hole to discharge internal air pressure, combined with a sound absorbing member and vibration plate, enhances the low-pitched sound characteristic without increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If piezoelectric elements are applied to display apparatuses, then thickness is reduced, but low-pitched sound reproduction capability deteriorates
Solution Approach 1:
The patent divides the display panel into multiple vibration regions (first region and second region) that can be independently controlled by separate vibration generating devices. This segmentation allows different regions to produce different sound frequencies, with specific regions optimized for low-pitched sound reproduction, thereby resolving the contradiction between thin design and low-frequency sound capability.
Solution Approach 2:
The patent introduces a new spatial dimension by creating a cavity structure between the display panel and rear housing, with strategic openings positioned at specific locations. This three-dimensional acoustic chamber design enables low-pitched sound reproduction without increasing the overall thickness of the display apparatus, as the acoustic resonance occurs within the internal cavity rather than requiring external space.
2Stability of the object's composition
If internal air pressure is increased in display apparatuses with piezoelectric elements, then structural stability is improved, but reproduction band of low-pitched sound band is limited
Solution Approach 1:
The patent applies local quality by creating specific openings (first opening and second opening) at strategically positioned locations on the rear housing, rather than uniformly distributing openings throughout the structure. These localized openings are positioned to correspond with specific vibration regions of the display panel, allowing low-pitched sound waves to escape at optimal points while maintaining structural integrity in other areas.
Solution Approach 2:
The patent introduces an intermediary acoustic chamber cavity between the display panel and rear housing that mediates between the high internal air pressure and the low-pitched sound reproduction requirement. This cavity acts as a buffer space that allows air pressure to be maintained for structural stability while providing room for acoustic wave development and escape through strategically positioned openings.
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 enlarges the reproduction band of low-pitched sound, improving sound quality by reducing internal air pressure and absorbing vibrations, thus achieving better sound characteristics without thickness increase.
Implementation Method 1
a vibration generating device at a rear surface of the display panel to vibrate the display panel
Implementation Method 2
a supporting member including a hole for discharging an air of an inner portion of the display apparatus may be provided, and thus, an air pressure of the inner portion of the display apparatus may be lowered
Implementation Method 3
a sound absorbing member disposed at an inner surface of the supporting member may be provided and may absorb a vibration of the supporting member
Data Source
AI summary
A display apparatus includes a display panel configured to display an image, a vibration generating device at a rear surface of the display panel to vibrate the display panel, and a supporting member at the rear surface of the display panel and including a first hole. The first hole may be disposed at a whole region or periphery of the vibration generating device.