Flat Panel Speaker Vibrator Placement to Suppress Stationary Waves
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Solution Overview
Problem
Flat panel speakers often experience a decline in sound quality due to glare and inadequate emission of specific frequency bands, primarily caused by stationary waves that occur in the vibration plate.
Innovation Solution
The placement of vibrators on the back surface of the flat panel or display cell is strategically avoided at locations that most easily vibrate across the entire range of audio frequencies, and a vibration controlling member is used to partition the surface and prevent interference between vibrators, thereby minimizing stationary waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If vibrators are disposed on the back surface of the flat panel to generate vibration, then sound output is achieved, but stationary waves occur causing sound quality decline
Solution Approach 1:
The patent applies local quality by strategically positioning vibrators at specific locations on the back surface of the flat panel where they do not coincide with vibration node positions. This localized placement optimization ensures that vibrators drive the panel without exciting stationary wave patterns, thereby achieving sound output while avoiding sound quality degradation from stationary wave interference.
2Adaptability or versatility
If multiple vibrators are used to improve sound coverage, then sound emission across frequency range is enhanced, but interference between vibrators creates stationary waves
Solution Approach 1:
The patent positions multiple vibrators at specifically determined locations on the back surface, ensuring that no vibrator coincides with vibration nodes of other vibrators across the audio frequency range. This localized placement strategy enables multiple vibrators to work cooperatively without generating stationary wave interference, thereby improving sound coverage while avoiding interference issues.
3Power
If vibrators are placed at locations that easily vibrate to maximize efficiency, then vibration generation is improved, but stationary waves are amplified
Solution Approach 1:
The patent identifies and avoids placement of vibrators at locations that correspond to vibration nodes across the audio frequency range. By selecting specific locations where vibrators do not coincide with these high-vibration zones, the patent prevents amplification of stationary waves while still achieving effective sound generation through the flat panel.
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 approach effectively suppresses the decline in sound quality by reducing the occurrence of large stationary waves, ensuring better sound emission across the frequency range.
Implementation Method 1
a plurality of vibrators that are disposed on a back surface of the flat panel or the display cell and cause the flat panel or the display cell to vibrate
Implementation Method 2
the plurality of vibrators are disposed to avoid a location that most easily vibrates in an entire range of audio frequencies when vibration is generated in the flat panel by the plurality of vibrators. A large stationary wave with respect to the flat panel therefore does not easily occur.
Data Source
AI summary
A flat panel speaker according to an embodiment of the disclosure includes a flat panel and a plurality of vibrators that are disposed on a back surface of the flat panel. The plurality of vibrators are disposed to avoid a location that most easily vibrates in an entire range of audio frequencies when vibration is generated in the flat panel by the plurality of vibrators. A large stationary wave with respect to the flat panel therefore does not easily occur.