Piezoelectric Speaker Arrangement for Low Frequency Sound Pressure
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Solution Overview
Problem
Piezoelectric speakers in display devices face challenges in achieving sufficient sound pressure in the low frequency range of 1 kHz or less.
Innovation Solution
A display device design incorporating a pair of piezoelectric elements arranged parallel to each other with specific spacing to amplify sound pressure in the low frequency range, with additional pairs positioned to intersect and enhance sound pressure levels across adjacent frequency ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If piezoelectric elements are used as speakers in display devices, then the speaker thickness is reduced and power consumption is lowered, but sufficient sound pressure cannot be obtained in the low frequency range of 1 kHz or less
Solution Approach 1:
The patent divides a single piezoelectric speaker into multiple piezoelectric elements (first, second, third, and fourth elements) arranged in specific patterns. By segmenting the speaker into multiple elements with different orientations and positions, the system achieves enhanced low-frequency sound pressure output while maintaining the thin profile characteristic of piezoelectric speakers.
Solution Approach 2:
Different piezoelectric elements are positioned at specific locations on the display panel with different orientations (first and second elements in horizontal direction, third and fourth elements in vertical direction). Each element contributes to sound pressure in specific frequency ranges, creating local quality variations that collectively improve overall low-frequency performance.
2Power
If multiple pairs of piezoelectric elements are arranged to reinforce different frequency ranges, then sound pressure is amplified in low frequency range, but device complexity increases
Solution Approach 1:
The piezoelectric elements serve multiple functions: they act as both the driving elements for sound generation and the structural components for frequency reinforcement. The first and second elements reinforce one frequency range while the third and fourth elements reinforce another frequency range, allowing the same type of component to perform multiple acoustic functions simultaneously.
Solution Approach 2:
The patent combines multiple piezoelectric elements into a unified speaker system integrated with the display panel. By merging the elements into pairs with specific orientations and positions, the system achieves complex acoustic performance (reinforcing multiple frequency ranges) through a relatively simple integrated structure rather than separate components.
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 design achieves a significant amplification of sound pressure in the low frequency range, ensuring a uniform and enhanced audio experience by widening the audible frequency range and maintaining consistent sound pressure levels.
Implementation Method 1
piezoelectric speakers using piezoelectric elements that are thin, light, and low in power consumption compared to magnetic speakers
Implementation Method 2
a first pair of piezoelectric elements including a first piezoelectric element and a second piezoelectric element arranged in parallel and spaced apart from each other by a first distance to reinforce at least a first frequency range between 130 Hz and 350 Hz
Data Source
AI summary
The present invention relates to a display device including a speaker using piezoelectric elements having an amplification effect in a low frequency range.