Inverter, NAND gate, and NOR gate

A NOR gate, comprising:

• a pull-down unit constituted by a fifth thin film transistor transferring a ground voltage according to a first input signal applied to a gate and a tenth thin film transistor outputting the ground voltage to an output terminal according to a second input signal applied to a gate;
• a pull-up unit constituted by a second thin film transistor transferring a first power voltage according to a voltage applied to a gate and a seventh thin film transistor outputting a ground voltage transferred from the fifth thin film transistor or a first power voltage transferred from the second thin film transistor to the output terminal according to a voltage applied to a gate;
• and
• a pull-up driver applying a second power voltage or the ground voltage to the gate of the second thin film transistor according to the first input signal and applying the second power voltage or the ground voltage to the gate of the seventh thin film transistor according to the second input signal.