Method for driving scan driver comprising plurality of scan-driving blocks
A scan driver includes scan-driving blocks, each including a first transistor having a gate coupled to a first node to supply a first power to an output terminal, a second transistor having a gate coupled to a second node to couple a second clock to the output terminal, a third transistor having a gate coupled to a first input to supply the first power to the first node, a fourth transistor having a gate coupled to a second input to supply a second power to the first node, and a fifth transistor having a gate coupled to a first clock to couple the first input to the second node. A first scan-driving block further includes a sixth transistor coupled between the second input and the fourth transistor gate, and a NOT gate configured to invert the first input signal and to supply the inverted signal to the sixth transistor gate.
1. 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, wherein the first scan-driving block comprises a NOT gate having a first electrode and a second electrode, wherein the first electrode of the NOT gate is directly coupled to the first signal input terminal of the first scan-driving block and the second electrode of the NOT gate is directly coupled to a gate electrode of a fifth transistor, wherein the fifth transistor further has a first electrode and a second electrode, the first electrode of the fifth transistor being directly coupled to the second signal input terminal and the second electrode of the fifth transistor being directly coupled to a gate electrode of a fourth transistor that is configured to supply the second power source voltage directly to the first node of the first scan-driving block.
2. The method of claim 1 , wherein the blocking of 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 comprises:
turning on, by the frame start signal of the gate-on voltage, a third transistor having a gate electrode coupled to the first signal input terminal of the first scan-driving block, to supply the first power source voltage to the first node of the first scan-driving block; and
turning off the fifth transistor.
3. The method of claim 2 , wherein the turning off the fifth transistor comprises inverting the frame start signal of the gate-on voltage and supplying the inverted frame start signal to a gate electrode of the fifth transistor.
4. The method of claim 3 , wherein the inverting of the frame start signal of the gate-on voltage and the supplying of the inverted frame start signal to the gate electrode of the fifth transistor comprises supplying the frame start signal of the gate-on voltage to the gate electrode of the fifth transistor through the NOT gate coupled between the first signal input terminal of the first scan-driving block and the gate electrode of the fifth transistor.