An amplifying circuit of a
display device including a plurality of pixels includes an input unit, a bias unit, and an output unit. The input unit is coupled between a first power source for supplying a first
voltage and a second power source for supplying a second
voltage, receives a first input
signal and a second input
signal, and is controlled by the first and second input signals. The bias unit receives a bias
voltage for operating the input unit, and includes a first node and a second node controllable by the input unit. The output unit applies an output voltage to a pixel by using a first output
transistor turned on / off by a
signal applied to the first node and a second output
transistor turned on / off by a signal applied to the second node, and the first output
transistor is a different type to the second output transistor. In this instance, the input unit includes a first input transistor having a first terminal coupled to a first power source and being turned on / off by a first input signal and a second input transistor of the same type as the first input transistor, having a first terminal coupled to the first power source, and being turned on / off by a second input signal. The bias unit includes a first transistor controllable by the on / off state of the first input transistor and a second transistor controllable by the on / off state of the second input transistor.