Scan driver and display device for driving a plurality of scan lines

A display device comprising:

• a display panel comprising a switching transistor connected to a scan line and a data line, an emission control transistor connected to the switching transistor and an organic light emitting diode;
• a timing controller configured to generate a first clock signal, a second clock signal different from the first clock signal and a third clock signal different from the first clock signal and the second clock signal;
• a scan driver configured to generate a plurality of scan signals based on the first clock signal, the second clock signal, and the third clock signal, to simultaneously output the plurality of scan signals during a simultaneous driving period and to sequentially output the plurality of scan signals during a sequential driving period, the scan driver comprises a plurality of circuit stages cascade-connected with each other, each circuit stage of the plurality of circuit stages comprising:
• a first input part configured to transfer a carry signal to a first node in response to a first clock signal;
• a second input part configured to transfer the first clock signal to a second node in response to a signal of the first node;
• a first output part configured to transfer a third clock signal to an output terminal in response to a signal of the second node;
• a holding part configured to maintain a signal of a third node in response to a second clock signal;
• a second output part configured to transfer a signal of the third node to the output terminal in response to the second clock signal:
• a first output control part configured to transfer the first clock signal to the second node in response to the first clock signal;
• and
• a second output control part configured to transfer a signal of the first node to the third node in response to a first driving voltage,
• wherein the second output control part comprises:
• an eighth transistor including a control electrode connected to a first driving voltage terminal and receiving always constant voltage that is the first driving voltage, a first electrode connected to the first node, and a second electrode connected to the third node.