Flat-Panel Piezo Speaker Layout for High-Frequency Sound Reproduction
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Solution Overview
Problem
Flat panel speakers using piezo elements face challenges in reproducing high sound ranges and require precise arrangement to avoid sound interference, especially in large display devices like televisions.
Innovation Solution
A display device with a flat panel and output unit featuring a vibrating element, two piezo elements, and cone-shaped speakers, arranged to optimize sound output and minimize interference, with controlled signal distribution to enhance sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a piezo element is used as a vibration exciter to compensate for high sound range, then high sound range reproduction is improved, but sound output quality deteriorates due to improper arrangement and interference with other vibration exciters
Solution Approach 1:
The patent applies local quality by assigning specific positions and orientations to different vibration exciters based on their functional requirements. The piezo element is specifically positioned at the center of the flat panel and oriented perpendicular to it, while exciters 2 and 3 are positioned at corners with specific orientations. This localized optimization of each exciter's position and orientation ensures that the piezo element effectively reproduces high sound ranges without causing interference, as each element operates in its optimized local zone.
Solution Approach 2:
The patent employs dynamics by controlling the driving frequencies of different vibration exciters to be different from each other. The control unit adjusts the driving frequencies dynamically to prevent resonance interference between the piezo element and other exciters. This dynamic frequency adjustment allows the piezo element to reproduce high sound ranges effectively while avoiding sound interference that would occur at fixed frequencies.
2Reliability
If multiple vibration exciters are arranged on the flat panel to improve sound output, then sound coverage is improved, but sound interference occurs between exciters
Solution Approach 1:
The patent applies local quality by assigning specific positions and orientations to different vibration exciters based on their functional requirements. The piezo element is specifically positioned at the center of the flat panel and oriented perpendicular to it, while exciters 2 and 3 are positioned at corners with specific orientations. This localized optimization of each exciter's position and orientation ensures that the piezo element effectively reproduces high sound ranges without causing interference, as each element operates in its optimized local zone.
Solution Approach 2:
The patent employs dynamics by controlling the driving frequencies of different vibration exciters to be different from each other. The control unit adjusts the driving frequencies dynamically to prevent resonance interference between the piezo element and other exciters. This dynamic frequency adjustment allows the piezo element to reproduce high sound ranges effectively while avoiding sound interference that would occur at fixed frequencies.
3Device complexity
If a single exciter is used to simplify the structure, then device complexity is reduced, but high sound range reproduction capability is insufficient
Solution Approach 1:
The patent applies segmentation by dividing the sound reproduction function across multiple specialized vibration exciters. The piezo element is dedicated to high sound range reproduction and positioned at the center, while exciters 2 and 3 handle other frequency ranges and are positioned at corners. This functional segmentation allows each exciter to be optimized for its specific purpose, with the piezo element providing effective high frequency reproduction without requiring a complex array of exciters for all frequency ranges.
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 device achieves improved sound reproduction across high, middle, and low frequencies with reduced sound deviation and enhanced localization, ensuring clear and balanced audio output.
Implementation Method 1
a first piezo element arranged on a left side when facing the display device, and a second piezo element arranged on a right side when facing the display device
Implementation Method 2
outputs sound by generating vibration in the flat panel by the vibration exciter
Data Source
AI summary
A display device includes a display unit including a flat panel that displays an image, and an output unit that is arranged on a back surface of the flat panel and outputs sound by driving of a plurality of vibration exciters, which vibrates the flat panel, and left and right two cone-shaped speakers. The vibration exciters includes one vibrating element arranged near a center of the flat panel, a first piezo element arranged on a left side when facing the display device, and a second piezo element arranged on a right side when facing the display device.