Audio Device with Electrodynamic and Piezoelectric Vibrators
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Solution Overview
Problem
Existing speaker systems that use exciters on the back surface of television displays struggle to achieve a sufficient sound pressure level across a wider frequency band, particularly at high frequencies with electrodynamic exciters and at low frequencies with piezoelectric exciters.
Innovation Solution
The use of both electrodynamic and piezoelectric vibrators in conjunction to vibrate a diaphragm, where the electrodynamic vibrator handles mid-low frequencies and the piezoelectric vibrator handles high frequencies, allowing for a broader frequency response and improved directional characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an electrodynamic exciter is used to vibrate the display, then the sound pressure level is sufficient at low frequencies, but the sound pressure level decreases at high frequencies
Solution Approach 1:
The patent combines an electrodynamic exciter and a piezoelectric exciter into a single speaker system. The electrodynamic exciter handles low-frequency sound reproduction while the piezoelectric exciter handles high-frequency sound reproduction, merging their complementary frequency responses to achieve uniform sound pressure level across the entire frequency band.
2Shape
If the area of the diaphragm is increased to improve directivity at high frequencies, then the directional angle becomes smaller, but the sound pressure level at lateral positions further decreases
Solution Approach 1:
The patent merges the functions of two different exciter types to simultaneously achieve good directivity and sufficient sound pressure level. The piezoelectric exciter provides wide directivity at high frequencies while the electrodynamic exciter maintains adequate sound pressure level, resolving the contradiction between directional angle and lateral sound pressure.
3Power
If a piezoelectric exciter is used to vibrate the display, then the sound pressure level is sufficient at high frequencies, but the sound pressure level is insufficient at low frequencies
Solution Approach 1:
The patent combines a piezoelectric exciter and an electrodynamic exciter in a single speaker system. The piezoelectric exciter provides sufficient sound pressure level at high frequencies while the electrodynamic exciter provides sufficient sound pressure level at low frequencies, merging their complementary strengths to achieve uniform frequency response across the entire audio spectrum.
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 combination achieves a uniform and sufficient sound pressure level across the entire frequency band, with a wide directional angle, enabling clear sound reproduction not only in front of the device but also laterally, enhancing the immersive experience.
Implementation Method 1
an electrodynamic vibrator that vibrates the diaphragm to output sound
Implementation Method 2
a piezoelectric vibrator that vibrates the diaphragm to output sound
Data Source
AI summary
The present technology relates to an audio device and a driving method thereof, and a display device which are configured to make it possible to obtain sufficient sound pressure level in a wider frequency band.The audio device includes: a diaphragm; an electrodynamic vibrator that vibrates the diaphragm to output sound; and a piezoelectric vibrator that vibrates the diaphragm to output sound. The present technology can be applied to the display device.