Patent ID: 7995049
Filing Date: 2011-08-09
Classification: G09G

Abstract:
1. 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, wherein the disable unit is electrically coupled to the first input unit, the second input unit, the second power supply terminal, and the first TFT; 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, a source electrically coupled to the output terminal, and a drain electrically coupled to the second power supply terminal; wherein the first input unit comprises: a third TFT having a drain, a gate electrically coupled to the first input terminal and the drain thereof, and a source; and a fourth TFT having a gate electrically coupled to the gate of the third TFT, a source electrically coupled to the gate of the first TFT, and a drain electrically coupled to the source of the third TFT and receiving the feedback signal from the feedback unit.