Pixel, display device and driving method thereof

1. A pixel, comprising:

an organic light emitting diode;

a driving circuit for generating and transmitting a driving current depending on data signals to the organic light emitting diode; and

at least one switch connected between a power wire for applying a first voltage to the organic light emitting diode and a data line for transmitting the data signals, the at least one switch including a compensating circuit for electronically connecting the power wire and the data line for a predetermined period to transmit the first voltage through the data line.

2. The pixel of claim 1 , wherein:

the predetermined period is a period of light emission when the organic light emitting diode is lighted.

3. The pixel of claim 1 , wherein:

the on/off of the switch is controlled depending on switching control signals.

4. The pixel of claim 1 , wherein:

the organic light emitting diode includes a first electrode connected to the driving circuit and a second electrode connected to a power supply for applying a second voltage, and

the voltage difference between the first voltage and the second voltage is kept above a predetermined voltage to light the organic light emitting diode for the predetermined period.

5. The pixel of claim 1 , wherein the switch:

electronically connects the power wire and the data line for periods other than the predetermined period; and

transmits the first voltage to reset the operation of the driving circuit.

6. The pixel of claim 5 , wherein the first voltage is a low voltage below a predetermined level.

7. The pixel of claim 1 , wherein the switch is a PMOS transistor or an NMOS transistor.

8. The pixel of claim 1 , wherein the driving circuit comprises:

a first transistor including a gate connected to a scan line for transmitting scan signals, a first end connected to the data line, and a second end connected to a first node;

a second transistor including a gate connected to a second node, a first end connected to the power wire, and a second end connected to the first electrode of the organic light emitting diode;

a third transistor including a gate connected to a gate line for transmitting gate signals, a first end connected to the second node, a second end connected to both the second end of the second transistor and the first electrode of the organic light emitting diode; and

a first capacitor including a first electrode connected to the first node and the other electrode connected to the second node.

9. The pixel of claim 8 , wherein the first to third transistors are a PMOS transistor or an NMOS transistor.

10. The pixel of claim 8 , further comprising:

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

11. The pixel of claim 1 , wherein:

the driving circuit is activated before the predetermined period to write data voltage depending on the data signals, and to compensate for the threshold voltage of a driving transistor for generating driving current depending on the data signals.

12. The pixel of claim 1 , wherein:

the organic light emitting diode includes a first electrode connected to the driving circuit and a second electrode connected to a power supply for applying a second voltage,

the first voltage is applied as a voltage value of at least three different levels for the one frame period, and

the second voltage is applied as a voltage value of at least two different levels for the one frame period.

13. The pixel of claim 12 , wherein:

the organic light emitting diode is lighted in the period in which the difference between the first voltage and the second voltage is the greatest.