| 摘要 |
PURPOSE: A driving circuit of an LCD is provided to output a gate turn-on voltage, a gate turn-off voltage, and a gamma reference voltage by forming a boost circuit using a voltage transformer. CONSTITUTION: A driving circuit of an LCD includes a PWM IC, a voltage transformer, a turn-on voltage output unit, a turn-off voltage output unit, and a gamma reference voltage output unit. The PWM IC(21) is used for modulating the pulse width according to amplitude of a signal wave. The voltage transformer(22) is used for varying the input voltage of the primary coil and transforming the induced voltage of the secondary coil according to the modulated pulse of the PWM IC. The turn-on voltage output unit(23) outputs a gate turn-on voltage of a TFT by rectifying and smoothing the output voltage of the voltage transformer. The turn-off voltage output unit(24) outputs a gate turn-off voltage of the TFT by rectifying and smoothing the output voltage of the voltage transformer. The gamma reference voltage output unit(25) outputs a gamma reference voltage by rectifying and smoothing the output voltage of the voltage transformer.
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