| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric speaker system, capable of reducing power consumption and preventing a glass plate from being damaged due to the vibration. SOLUTION: The piezoelectric system is provided with a glass plate, a piezoelectric element 120 and a low-pass filter 160. The glass plate forms a rear substrate for a display panel filled with a liquid crystal or an inert gas. The element 120 is stuck on the rear surface of the glass plate, vibrates in response to an supplied electric signal, and transmits the vibration to the glass plate. The glass plate and the element 120 forms the diaphragm of a speaker. The filter 160 decreases the signal level of components of a prescribe cut-off frequency out of signals generated from a signal source 150 and feeds it to the element 120. Accordingly, since a signal having fewer high-frequency components flows through the element 120, power consumption is reduced. Further, since the vibration of the glass plate is reduced, the glass plate is protected from being damaged due to vibration.
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