Patent ID: 7652435

Claim:
A lamp driving circuit comprising: a first voltage generator which receives a direct current power voltage and outputs a first square wave voltage through a first output terminal in response to a first switching signal and a second switching signal having a phase which is inverted with respect to a phase of the first switching signal; a second voltage generator which receives the direct current power voltage and outputs n (n≧2) second square wave voltages through corresponding n second output terminals, each n second square wave voltage having a phase different than the phase of the first square wave voltage, in response to n third switching signals shifted by a predetermined time with respect to the phase of the first switching signal, and n fourth switching signals each having a phase which is inverted with respect to a corresponding phase of the n third switching signals; and a boosting part having n transformers, wherein n first input terminals of the n transformers are commonly connected to the first output terminal of the first voltage generator, n second input terminals of the n transformers are connected to respective n second output terminals of the second voltage generator, and each of the n transformers boosts a first driving voltage defined by an electric potential difference between the first square wave voltage and the corresponding second square wave voltage to a second driving voltage having a voltage level greater than a voltage level of the first driving voltage and applies the second driving voltages to a corresponding lamp.