Scan driver and organic light emitting display using the same

1. A scan driver comprising:

a first signal processing unit for receiving a main input signal and a sub input signal to output a first output signal and a second output signal, wherein each of the first and second output signals is generated according to both of the main input signal and the sub input signal;

a second signal processing unit for receiving the first output signal, the second output signal, and a clock signal to output a scan signal; and

a third signal processing unit for receiving the first output signal and the second output signal to output an emission control signal, wherein a width of the emission control signal is controlled using the main input signal and the sub input signal.

2. The scan driver as claimed in claim 1 , wherein the signal processing units are coupled to a driving power source and a ground power source.

3. The scan driver as claimed in claim 1 , wherein the first signal processing unit comprises:

a first transistor having a gate electrode for receiving the sub input signal, a first electrode coupled to a first node, and a second electrode coupled to a ground power source;

a second transistor having a gate electrode for receiving the main input signal, a first electrode coupled to the first node, and a second electrode coupled to a driving power source;

a third transistor having a gate electrode coupled to the first node, a first electrode coupled to the driving power source, and a second electrode;

a fourth transistor having a gate electrode coupled to the first node, a first electrode coupled to the second electrode of the third transistor, and a second electrode coupled to a second node; and

a fifth transistor having a gate electrode for receiving the main input signal, a first electrode coupled to the second node, and a second electrode coupled to a ground power source,

wherein the first output signal is output to the first node, and

wherein the second output signal is output to the second node.

4. The scan driver as claimed in claim 1 , wherein the second signal processing unit comprises:

a first transistor having a gate electrode coupled to a first node of the first signal processing unit, a first electrode coupled to a driving power source, and a second electrode coupled to a third node;

a second transistor having a gate electrode coupled to a second node of the first signal processing unit, a first electrode coupled to the third node, and a second electrode for receiving a clock signal; and

a first capacitor coupled between the second node and the third node,

wherein the scan signal is output to the third node.

5. The scan driver as claimed in claim 1 , wherein the third signal processing unit comprises:

a first transistor having a gate electrode coupled to a second node of the first signal processing unit, a first electrode coupled to a driving power source, and a second electrode coupled to a fourth node;

a second transistor having a gate electrode coupled to a first node of the first signal processing unit, a first electrode coupled to the fourth node, and a second electrode coupled to a ground power source; and

a first capacitor coupled between the first node and the fourth node,

wherein an emission control signal is output to the fourth node.

6. An organic light emitting display, comprising:

a display unit comprising pixels coupled to scan lines, emission control lines, data lines, a first power source, and a second power source;

a scan driver comprising a plurality of stages coupled to the scan lines and the emission control lines to provide scan signals and emission control signals to the pixels through the scan lines and the emission control lines; and

a data driver for supplying data signals to the pixels through the data lines,

wherein each of the stages comprises:

a first signal processing unit for receiving a main input signal and a sub input signal to output a first output signal and a second output signal, wherein each of the first and second output signals is generated according to both of the main input signal and the sub input signal;

a second signal processing unit for receiving the first output signal, the second output signal, and a clock signal to output a scan signal; and

a third signal processing unit for receiving the first output signal and the second output signal to output an emission control signal, wherein a width of the emission control signal is controlled using the main input signal and the sub input signal.

7. The organic light emitting display as claimed in claim 6 , wherein each of the signal processing units is coupled to a driving power source and a ground power source.

8. The organic light emitting display as claimed in claim 6 , wherein a scan signal output from an ith stage is configured to be supplied as the main input signal of an (i+1)th stage, wherein i is a natural number.

9. The organic light emitting display as claimed in claim 6 , wherein the first signal processing unit comprises:

a first transistor having a gate electrode for receiving the sub input signal, a first electrode coupled to a first node, and a second electrode coupled to a ground power source;

a second transistor having a gate electrode for receiving the main input signal, a first electrode coupled to the first node, and a second electrode coupled to a driving power source;

a third transistor having a gate electrode coupled to the first node, a first electrode coupled to a driving power source, and a second electrode;

a fourth transistor having a gate electrode coupled to the first node, a first electrode coupled to the second electrode of the third transistor, and a second electrode coupled to a second node; and

a fifth transistor having a gate electrode for receiving the main input signal, a first electrode coupled to the second node, and a second electrode coupled to a ground power source,

wherein the first output signal is output to the first node, and

wherein the second output signal is output to the second node.

10. The organic light emitting display device as claimed in claim 6 , wherein the second signal processing unit comprises:

a first transistor having a gate electrode coupled to a first node of the first signal processing unit, a first electrode coupled to a driving power source, and a second electrode coupled to a third node;

a second transistor having a gate electrode coupled to a second node of the first signal processing unit, a first electrode coupled to the third node, and a second electrode for receiving a clock signal; and

a first capacitor coupled between the second node and the third node,

wherein the scan signal is output to the third node.

11. The organic light emitting display as claimed in claim 6 , wherein the third signal processing unit comprises:

a first transistor having a gate electrode coupled to a second node of the first signal processing unit, a first electrode coupled to a driving power source, and a second electrode coupled to a fourth node;

a second transistor having a gate electrode coupled to a first node of the first signal processing unit, a first electrode coupled to the fourth node, and a second electrode coupled to a ground power source; and

a first capacitor coupled between the first node and the fourth node,

wherein an emission control signal is output to the fourth node.