Organic electroluminescence display device

1. An electroluminescence display device comprising:

a data driver for supplying a data current according to a data signal;

a first switching device for transferring a data current using a first scan signal;

a second switching device for transferring the data current from the first switching device using a second scan signal;

a storage device for storing a charge voltage according to the data current transferred from the second switching device;

a coupling unit for changing the charge voltage stored in the storage device in accordance with the first scan signal into a changed voltage;

a first driving device and a second driving device for generating a driving current in accordance with the changed voltage; and

an organic light emitting diode for emitting light in accordance with the driving current,

wherein the first switching device has one end supplied with the data current and the other end connected with one end of the second switching device, the second switching device has the other end connected with one end of the coupling unit, the storage device has one end to which a power voltage is connected, the coupling unit has one end connected with the other end of the storage device and the other end to which the first scan signal is input, and gates of the first driving device and the second driving device is connected with each other.

2. The electroluminescence display device as claimed in claim 1 , wherein the two transistors include P-type transistors.

3. The electroluminescence display device as claimed in claim 1 , wherein the first and second switching devices include P-type transistors.

4. The electroluminescence display device as claimed in claim 1 , wherein the one end of the coupling unit is connected with one end of the storage device.

5. The electroluminescence display device as claimed in claim 4 , wherein the voltage supplied from an other end of the storage device drives the first driving device and the second driving device.

6. The electroluminescence display device as claimed in claim 5 , wherein the first driving device has one end connected with the organic light emitting diode and the other end connected with one end of the second driving device,

wherein the second driving device has the other end connected with ground.

7. A method of operating electroluminescence display, comprising applying a first scan signal having a low voltage state to a first switching device for transferring a data current;

applying a second scan signal having the low voltage state to a second switching device for transferring the data current from the first switching;

charging a storage device with a charge voltage according to the data current transferred from the second switching device;

changing the low voltage state of the second scan signal into a high voltage state;

changing the low voltage state of the first scan signal into a high voltage state for changing the charge voltage stored in the storage device with a coupling unit in accordance with the first scan signal into a changed voltage;

applying the changed voltage simultaneously to the first and second driving devices; and

driving an organic light emitting diode for emitting light in accordance with a driving current through the first and second driving devices,

wherein the second scan signal is input within an input time period of the first scan signal.