Scan driver circuit and driving method for the scan driver circuit

1. A scan driving circuit, comprising:

a plurality of stages, each of the stages including:

a shift register including a first node to receive a first driving voltage according to a control signal and a second node to receive the first driving voltage according to a reset signal; and

a scan signal output unit to output a plurality of scan signals to a respective plurality of scan lines, the scan signal output unit including a plurality of clock switches controlled according to a voltage of the first node and a plurality of scan switches controlled according to a voltage of the second node, wherein:

the clock switches are to sequentially output a plurality of clock signals to a respective plurality of third nodes, the third nodes connected to respective ones of the scan lines, and

the scan switches are to output a second driving voltage to the third nodes connected to respective one of the scan lines, wherein the scan signal output unit is to simultaneously receive the clock signals in a predetermined unit group having at least two clock signals and to simultaneously output the scan signals as unit group scan signals in accordance with the at least two clock signals, wherein:

the stages include a current stage and a previous stage, and while the current stage outputs the clock signals to the third nodes corresponding to the scan signals, the previous stage is turned off, wherein:

the control signal is a carry signal of the previous stage, and the shift register includes:

a first transistor including a first electrode to receive the first driving voltage, a second electrode connected to the first node, and a control electrode to receive the carry signal of the previous stage;

a second transistor including a first electrode to receive the second driving voltage, a second electrode connected to receive a carry signal of the current stage, and a control electrode connected to the second node;

a third transistor including a first electrode to receive the carry signal of the current stage, a second electrode connected to a COM clock signal line, and a control electrode connected to the first node; and

a fourth transistor including a first electrode to receive the second driving voltage, a second electrode connected to the second node, and a control electrode connected to the second electrode of the first transistor.

2. The scan driving circuit of claim 1 , wherein the shift register includes:

a fifth transistor including a first electrode to receive the second driving voltage, a second electrode connected to the first node, and a control electrode connected to the second node;

a sixth transistor including a first electrode to receive the first driving voltage, a second electrode connected to the second node, and a control electrode to which the reset signal is applied; and

a seventh transistor including a first electrode connected to the second electrode of the first transistor, a second electrode connected to the first node, and a control electrode to which the first driving voltage is applied.

3. The scan driving circuit of claim 2 , wherein:

the clock switches include first electrodes to receive respective ones of the clock signals, second electrodes connected to the third nodes which are connected to corresponding ones of the scan lines, and control electrodes connected to the first node, the scan driving circuit further including:

a plurality of on switches, each of the on switches including a first electrode connected to the first node, a second electrode connected to the control electrode of a corresponding one of the clock switches, and a control electrode to receive the first driving voltage; and

a plurality of capacitors, each of the capacitors connected between the second electrode and the control electrode of a corresponding one of the clock switches, the on switches to be continuously turned on.

4. A method for driving a scan driving circuit including a plurality of stages, each of the stages including a shift register and a scan signal output unit, the shift register including a first node and a second node, the scan signal output unit including a plurality of clock switches controlled according to a voltage of the first node and a plurality of scan switches controlled according to a voltage of the second node, the method comprising:

applying a first driving voltage to the first node according to a control signal;

inputting a plurality of clock signals to each of the plurality of stages, including initializing the stage by simultaneously inputting the clock signals in a predetermined unit group of at least two clock signals, the nodes simultaneously outputting scan signals to respective ones of the scan lines as unit group scan signals;

sequentially outputting the clock signals to nodes connected to a respective plurality of scan lines;

outputting a carry signal according to a COM clock signal;

applying the first driving voltage to the second node according to a reset signal; and

outputting a second driving voltage to the nodes connected to the scan lines, wherein:

the stages include a current stage and a previous stage, and the method further includes turning off the previous stage while the clock signal are output to the nodes connected to the scan lines in the current stage, wherein the shift register includes:

a first transistor including a first electrode to receive the first driving voltage, a second electrode connected to the first node, and a control electrode to receive a carry signal of the previous stage;

a second transistor including a first electrode to receive the second driving voltage, a second electrode connected to a carry signal line of the current stage, and a control electrode connected to the second node;

a third transistor including a first electrode connected to the carry signal line of the current stage, a second electrode connected to a COM clock signal line, and a control electrode connected to the first node; and

a fourth transistor including a first electrode to receive the second driving voltage is applied, a second electrode connected to the second node, and a control electrode connected to the second electrode of the first transistor, and

the control signal is a carry signal of the previous stage.

5. The method of claim 4 , wherein the shift register includes:

a fifth transistor including a first electrode to receive the second driving voltage, a second electrode connected to the first node, and a control electrode connected to the second node;

a sixth transistor including a first electrode to receive the first driving voltage, a second electrode connected to the second node, and a control electrode connected to a reset signal line; and

a seventh transistor including a first electrode connected to the second electrode of the first transistor, a second electrode connected to the first node, and a control electrode to receive the first driving voltage.

6. The method of claim 5 , wherein the scan signal output unit includes:

a plurality of clock switches, each clock switch including a first electrode to receive a corresponding one of the clock signals, a second electrode connected to a corresponding one of the scan lines, and a control electrode connected to the first node;

a plurality of on switches, each of the on switches including a first electrode connected to the first node, a second electrode connected to the control electrode of a corresponding one of the clock switches, and a control electrode to receive the first driving voltage; and

a plurality of capacitors, each of the capacitors connected between the second electrode and the control electrode of a corresponding one of the clock switches, the on switches continuously turned on.