Patent ID: 8614700

Claim:
A voltage level shifter, comprising: a first input terminal for receiving a first input signal; a second input terminal for receiving a second input signal; an output terminal; a first power supply terminal; a second power supply terminal; a first input unit for receiving the first input signal so as to output a first switching control signal; a first TFT for receiving the first switching control signal, wherein the first TFT has a gate electrically coupled to the first input unit, a source electrically coupled to the first power supply terminal, and a drain electrically coupled to the output terminal; a second input unit, electrically coupled to the second power supply terminal, for receiving the second input signal and outputting a second switching control signal; a disable unit for disabling the first TFT and comprising: a seventh TFT having a source electrically coupled to the gate of the first TFT and the first input unit, a drain, and a gate; and an eighth TFT having a source electrically coupled to the drain of the seventh TFT, a drain electrically coupled to the second power supply terminal, and a gate for electrically coupled to the second input unit and receiving the second switching control signal from the second input unit; a feedback unit for transmitting a feedback signal to the first input unit and the disable unit in response to an output signal of the output terminal; and a second TFT for receiving the second switching control signal, wherein the second TFT has a gate electrically coupled to the second input unit, the gate of the seventh TFT, and the gate of the eighth TFT, a source electrically coupled to the output terminal, and a drain electrically coupled to the second power supply terminal.