Display Panel Sound Module Vibration Control
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Solution Overview
Problem
Conventional display apparatuses face challenges in producing high-quality sound due to interference from reflected sounds, leading to deteriorated sound quality and immersion experience, particularly with piezoelectric elements which are brittle and prone to damage from external impacts.
Innovation Solution
A display apparatus with a sound generating module on its rear surface that vibrates the display panel to improve low-pitched sound reproduction and sound pressure flatness, featuring a vibration member, a plate, and supporting members to reduce resonance frequency and unnecessary vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a piezoelectric element is used to achieve a thin profile, then the thickness is reduced, but the element becomes brittle and prone to damage from external impacts
Solution Approach 1:
A buffer member is disposed between the piezoelectric element and the external environment to absorb and mitigate external impacts before they reach the brittle piezoelectric element. This cushioning structure prevents direct transmission of impact forces, thereby protecting the element from damage while maintaining the thin profile design.
Solution Approach 2:
The sound generating module employs a composite structure combining the piezoelectric element with a buffer member made of different material properties. This composite design allows the piezoelectric element to maintain its thin, high-performance characteristics while the buffer member provides mechanical protection and impact absorption, resolving the contradiction between thinness and durability.
2Device complexity
If sound is output in a rearward or downward direction, then the sound system structure is simple, but sound quality deteriorates due to interference from reflected sounds
Solution Approach 1:
The invention redirects sound output from the traditional rearward or downward direction to an upward direction, utilizing the vertical dimension above the display apparatus. This dimensional change allows sound waves to propagate forward through the air without encountering reflective surfaces behind or below the device, thereby eliminating sound quality deterioration while maintaining structural simplicity.
3Stability of the object's composition
If the resonance frequency is high, then the structure is rigid and stable, but the lowest pitched sound range that can be output is limited
Solution Approach 1:
The invention modifies the resonance frequency parameter of the sound generating module by adjusting the physical dimensions, material properties, or structural configuration of the piezoelectric element and its mounting structure. By lowering the resonance frequency to an appropriate range, the system can effectively reproduce low-pitched sounds while maintaining sufficient structural stability through optimized design parameters.
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 improving low-pitched sound reproduction and sound pressure flatness, reducing resonance frequency, and minimizing vibration-related issues, while maintaining a thin profile and enhancing durability.
Implementation Method 1
a vibration member configured to vibrate the plate
Implementation Method 2
a piezoelectric element capable of implementing a thin profile
Data Source
AI summary
A display apparatus includes a display panel configured to display an image; a plate on a rear surface of the display panel; a rear structure on a rear surface of the plate and configured to support the display panel; a vibration member configured to vibrate the plate; and a first supporting member between a periphery of the plate and the rear structure.