Display device, scan driving device and driving method thereof

A method for driving a scan driver comprising a plurality of scan-driving blocks, each of the scan-driving blocks comprising a first node configured to receive a first power source voltage in response to a first signal being applied to a first signal input terminal and to receive a second power source voltage in response to a second signal being applied to a second signal input terminal, a first transistor configured to supply the first power source voltage to an output terminal in response to a voltage of the first node, a second node configured to receive the first signal being applied to the first signal input terminal in response to a clock signal being applied to a first clock signal input terminal, and a second transistor configured to couple a second clock signal input terminal to the output terminal in response to a voltage of the second node, the method comprising:

• applying a frame start signal of a gate-on voltage as the first signal to the first signal input terminal of a first scan-driving block among the scan-driving blocks as power of the scan driver is turned on;
• applying a first clock signal of the gate-on voltage to the first clock signal input terminal of the first scan-driving block and applying a second clock signal of a gate-off voltage to the second clock signal input terminal of the first scan-driving block;
• inputting a scan signal of the gate-on voltage of a second scan-driving block of the scan-driving blocks as the second signal to the second signal input terminal of the first scan-driving block when the frame start signal of the gate-on voltage is applied as the first signal to the first signal input terminal of the first scan-driving block;
• and
• blocking the first node of the first scan-driving block from receiving the second power source voltage when the frame start signal of the gate-on voltage is applied as the first signal to the first signal input terminal of the first scan-driving block and the scan signal of the gate-on voltage of the second scan-driving block is applied as the second signal to the second signal input terminal of the first scan-driving block.