Patent ID: 7388402

Claim:
A level shift circuit receiving a low-voltage signal to generate a corresponding high-voltage signal, the circuit comprising: a first transistor of a first type, having a gate receiving the low-voltage signal and a source receiving a first supply voltage, wherein the first transistor is located in a source driver for a low temperature poly-silicon panel, and the first type is N type; a second transistor of a second type, having a source receiving a second supply voltage and a drain coupled to a drain of the first transistor, wherein the second type is P type; a third transistor of the second type, having a source receiving the second supply voltage, a drain outputting the high-voltage signal and a gate coupled to a gate of the second transistor; and a fourth transistor of the second type, having a source and a gate commonly coupled to receive a third supply voltage, and a drain coupled to the drain of the third transistor, wherein the second, third and fourth transistors are located in the low temperature poly-silicon panel.