Patent ID: 7323923

Claim:
A driver circuit, comprising: a level shift unit including a first P-channel metal-oxide semiconductor (PMOS) transistor, a second PMOS transistor, a first N-channel metal-oxide semiconductor (NMOS) transistor and a second NMOS transistor, wherein a source, a drain and a gate of said first PMOS transistor are respectively connected to a high voltage power supply, a first contact and a second contact, a source, a drain and a gate of said second PMOS transistor are respectively connected to the high voltage power supply, the second contact and the first contact, a source of said first NMOS transistor is grounded, a drain of said first NMOS transistor is connected to the first contact, and a gate of said first NMOS transistor receives a first signal, and a source of said second NMOS transistor is grounded, a drain of said second NMOS transistor is connected to the second contact, and a gate of said second NMOS transistor receives a second signal; a low voltage control unit, which is connected to a low voltage power supply, operable to output, according to an input signal, the first signal to the gate of said first NMOS transistor and the second signal to the gate of said second NMOS transistor; and a push-pull output unit operable to perform a switching operation based on a signal at the first contact of said level shift unit and a third signal outputted from said low voltage control unit, wherein a driving current of said first PMOS transistor is higher than a driving current of said first NMOS transistor.