Scan driving device and driving method thereof

1. A scan driving device including a plurality of scan driving blocks that are sequentially arranged, wherein the scan driving blocks respectively include:

a first node configured to receive a second power source voltage according to a clock signal that is input to a first clock signal input terminal;

a second node configured to receive a first power source voltage according to the clock signal that is input to the first clock signal input terminal, and to receive an input signal according to a clock signal that is input to a second clock signal input terminal;

a first transistor including a gate electrode that is connected to the first node, a first electrode that is connected to the first power source voltage, and a second electrode that is connected to an output terminal; and

a second transistor including a gate electrode that is connected to the second node, a first electrode for receiving a clock signal that is input to a third clock signal input terminal, and a second electrode that is connected to the output terminal,

wherein, during an initial driving period, the input signal is applied with a gate off voltage, and the clock signal that is input to the first clock signal input terminal, the clock signal that is input to the second clock signal input terminal, and the clock signal that is input to the third clock signal input terminal have are applied with a gate on voltage to reset a voltage at the first node with the gate on voltage and reset a voltage at the second node with the gate off voltage, and wherein

the scan driving blocks output scan signals with a gate off voltage when a voltage at the first node is reset with a gate on voltage and a voltage at the second node is reset with a gate off voltage.

2. The scan driving device of claim 1 , wherein the input signal represents a scan signal of a previously arranged scan driving block from among the scan driving blocks.

3. The scan driving device of claim 1 , further including:

a first capacitor including a first electrode connected to the gate electrode of the second transistor and a second electrode connected to the second electrode of the second transistor.

4. The scan driving device of claim 1 , further including:

a third transistor including a gate electrode connected to the first clock signal input terminal, a first electrode connected to the second power source voltage, and a second electrode connected to the first node.

5. The scan driving device of claim 1 , further including:

a fourth transistor including a gate electrode connected to the first node, a first electrode connected to the first power source voltage, and a second electrode connected to the second node.

6. The scan driving device of claim 1 , further including:

a fifth transistor including a gate electrode connected to the second clock signal input terminal, a first electrode configured to receive the input signal, and a second electrode connected to the second node.

7. The scan driving device of claim 1 , further including:

a sixth transistor including a gate electrode for receiving the input signal, a first electrode connected to the first power source voltage, and a second electrode connected to the first node.

8. The scan driving device of claim 1 , further including:

a second capacitor including a first electrode connected to the first power source voltage and a second electrode connected to the first node.

9. The scan driving device of claim 1 , further including:

a seventh transistor including a gate electrode configured to receive a floating signal, a first electrode connected to the first power source voltage, and a second electrode connected to the second node.

10. The scan driving device of claim 9 , further including:

an eighth transistor including a gate electrode connected to the floating signal input terminal, a first electrode connected to the first power source voltage, and a second electrode connected to the first node.

11. A method for driving a scan driving device including a plurality of scan driving blocks including:

a first node configured to receive a second power source voltage according to a clock signal that is input to a first clock signal input terminal;

a second node configured to receive a first power source voltage according to the clock signal that is input to the first clock signal input terminal, and to receive an input signal according to a clock signal that is input to a second clock signal input terminal;

a first transistor having a gate electrode connected to the first node and configured to transmit the first power source voltage to an output terminal; and

a second transistor having a gate electrode connected to the second node and configured to transmit a clock signal that is input to a third clock signal input terminal to the output terminal, the method comprising:

resetting the first node of the plurality of scan driving blocks with a gate on voltage, respectively, and resetting the second node of the scan driving blocks with a gate off voltage to reset the scan driving blocks; and

controlling the scan driving blocks to sequentially output scan signals, wherein

resetting the first and the second nodes of the plurality of scan driving blocks includes, during an initial driving period, maintaining the input signal having a gate off voltage and maintaining the clock signal that is input to the first clock signal input terminal, the clock signal that is input to the second clock signal input terminal, and the clock signal that is input to the third clock signal input terminal having a gate on voltage.

12. The method of claim 11 , wherein resetting the first node of the plurality of scan driving blocks includes:

applying the clock signal that is input to the first clock signal input terminal that is connected to a gate electrode of a third transistor to transmit the second power source voltage to the first node, wherein the second power source voltage corresponds to the gate on voltage.

13. The method of claim 12 , wherein applying the clock signal that is input to the first clock signal input terminal includes:

turning on a fourth transistor by the second power source voltage to transmit the first power source voltage to the second node, the fourth transistor having a gate electrode connected to the first node and configured to transmit the first power source voltage to the second node.

14. The method of claim 11 , wherein resetting the first and the second nodes of the plurality of scan driving blocks includes:

outputting scan signals with the gate off voltage at the output terminals of the scan driving blocks when a voltage at the first node is reset with the gate on voltage and a voltage at the second node is reset with the gate off voltage.

15. The method of claim 14 , wherein resetting the first and the second nodes of the plurality of scan driving blocks includes:

applying the clock signal that is input to the second clock signal input terminal that is connected to a gate electrode of a fifth transistor to transmit the input signal to the second node, the input signal having a gate on voltage.

16. The method of claim 15 , wherein the input signal represents a scan signal of the gate off voltage of a previously driven scan driving block.

17. The method of claim 15 , wherein resetting the first and the second nodes of the plurality of scan driving blocks includes:

turning off a sixth transistor for transmitting the first power source voltage to the first node according to the input signal.

18. The method of claim 11 , wherein resetting the first and the second nodes of the plurality of scan driving blocks includes:

turning off a seventh transistor for transmitting the first power source voltage to the second node according to a floating signal and an eighth transistor for transmitting the first power source voltage to the first node according to the floating signal.

19. A method for driving a scan driving device including a plurality of scan driving blocks including a first transistor having a gate electrode connected to a first node and configured to transmit a first power source voltage to an output terminal, a second transistor having a gate electrode connected to a second node and configured to transmit a clock signal to the output terminal, an eighth transistor for transmitting a gate off voltage to the first node according to a floating signal, and a seventh transistor for transmitting a gate off voltage to the second node according to the floating signal, the method comprising:

floating the output terminal by transmitting the gate off voltage to the first node and the second node of the scan driving blocks according to the floating signal;

resetting the first node of the scan driving blocks with a gate on voltage and resetting the second node of the scan driving blocks with the gate off voltage to reset the scan driving blocks; and

outputting, sequentially, scan signals from the plurality of scan driving blocks.

20. A scan driving device including a plurality of scan driving blocks that are sequentially arranged, wherein the scan driving blocks respectively include:

a first node configured to receive a second power source voltage according to a clock signal that is input to a first clock signal input terminal;

a second node configured to receive a first power source voltage according to the clock signal that is input to the first clock signal input terminal, and to receive an input signal according to a clock signal that is input to a second clock signal input terminal;

a first transistor including a gate electrode that is connected to the first node, a first electrode that is connected to the first power source voltage, and a second electrode that is connected to an output terminal;

a second transistor including a gate electrode that is connected to the second node, a first electrode for receiving a clock signal that is input to a third clock signal input terminal, and a second electrode that is connected to the output terminal;

a seventh transistor including a gate electrode configured to receive a floating signal, a first electrode connected to the first power source voltage, and a second electrode connected to the second node; and

an eighth transistor including a gate electrode connected to an input terminal of the floating signal, a first electrode connected to the first power source voltage, and a second electrode connected to the first node, wherein

when the seventh transistor and the eighth transistor are turned on by the floating signal, the output terminal is floating.