Flat Panel Speaker Piezo Element Arrangement for High Frequency Sound
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Solution Overview
Problem
Flat panel speakers in display devices, such as televisions, struggle to reproduce high sound ranges effectively, and adjusting the position and direction of piezo elements is crucial for achieving excellent sound output in both small and large display devices.
Innovation Solution
A display device with a flat panel speaker system that includes two cone-shaped speakers and a configuration of three vibration exciters: two piezo elements for high sound range output and one vibrating element for middle sound range output. The piezo elements are strategically arranged on the left and right sides with the vibrating element as the center, and the output control unit dynamically adjusts signal distribution to optimize sound output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an exciter is used as a vibration exciter, then the flat panel speaker can be constructed, but the ability to reproduce high sound range is low
Solution Approach 1:
The patent divides the vibration excitation function into multiple specialized components: piezo elements for high sound range and exciters for other ranges. This segmentation allows each component to optimize its performance for its designated frequency range, resolving the contradiction between high sound range reproduction and device complexity.
Solution Approach 2:
The patent applies different types of vibration exciters at different locations on the flat panel. Piezo elements are positioned specifically for high sound range excitation, while exciters are positioned for other frequency ranges. This local quality differentiation enables each region to contribute optimally to its target frequency range.
2Reliability
If a piezo element is used to compensate for high sound range in a large display device, then high sound range output is improved, but the position and direction arrangement becomes complex to achieve excellent sound output
Solution Approach 1:
The patent positions piezo elements at specific locations (above and below the center in the vertical direction) and orientations on the flat panel back surface. This localized arrangement optimizes high sound range output while maintaining manageable complexity through standardized positioning patterns.
Solution Approach 2:
The patent employs asymmetric positioning of piezo elements relative to the flat panel center, placing them at specific vertical offsets. This asymmetric arrangement is optimized for high sound range reproduction and simplifies the overall design compared to symmetric multi-element configurations.
3Power
If multiple vibration exciters are used, then sound output capability is improved, but the sounds may interfere with each other requiring adjustment
Solution Approach 1:
The patent assigns different frequency range responsibilities to different vibration exciters: piezo elements for high sound range and exciters for other ranges. This functional differentiation reduces sound interference by ensuring each exciter operates in its optimal frequency band, simplifying overall sound adjustment.
Solution Approach 2:
The patent segments the frequency spectrum into different ranges handled by different exciter types. This segmentation prevents frequency overlap and interference between exciters, making sound adjustment more straightforward while maintaining high overall output capability.
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 enhances sound reproduction capabilities across various sound ranges, reduces interference between multiple sound outputs, and improves sound quality by optimizing the placement and operation of vibration exciters and cone-shaped speakers.
Implementation Method 1
two piezo elements for a high sound range output
Implementation Method 2
a plurality of vibration exciters, which vibrates the flat panel
Data Source
AI summary
A display device (100) 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 two cone-shaped speakers. The vibration exciters includes two piezo elements for a high sound range output and one vibrating element for a middle sound range output. The two piezo elements are respectively arranged on left and right sides with the vibrating element as a center on the back surface of the flat panel, and are arranged above the vibrating element in a height direction.