A piezoelectric inverter LCD for back-light has been investigated. Modified-Rosen transformer, which was obtained by changing structure of output-electrode, generate less heat compared with transformer using transverse effect in output part. Driving circuit was also modified by using inductor to prevent rush current. As a result, higher efficiency of the inverter (85 percent) was obtained, and moreover, transformer was downsized for 3W-inverter. Also 6W and 10W inverter were developed.
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