Pixel circuit and method of driving the same

1. A pixel circuit comprising:

a light emission element;

a driving transistor including a first electrode electrically coupled to the light emission element, a second electrode, and a gate electrode;

a second transistor including a first electrode electrically coupled to a line transferring a power voltage, a second electrode electrically coupled to the second electrode of the driving transistor, and a gate electrode which receives a first signal;

a third transistor including a first electrode electrically coupled to the second electrode of the driving transistor, a second electrode electrically coupled to the gate electrode of the driving transistor, and a gate electrode which receives a second signal;

a storage capacitor including a first electrode and a second electrode, one of the first electrode and the second electrode of the storage capacitor electrically coupled to the gate electrode of the driving transistor; and

a switching transistor including a first electrode, a second electrode, and a gate electrode which receives a third signal, one of the first electrode and the second electrode of the switching transistor electrically coupled to a data line.

2. The pixel circuit of claim 1 , wherein each of the driving transistor, the second transistor, the third transistor, and the switch transistor is an N-channel metal oxide semiconductor (NMOS) transistor.

3. The pixel circuit of claim 1 , wherein the second transistor is turned on in a first period and in a fourth period and is turned off in a second period and in a third period in response to the first signal,

wherein the first period is to initialize a voltage at the first electrode of the storage capacitor and the gate electrode of the driving transistor,

wherein the second period is to compensate a threshold voltage of the driving transistor,

wherein the third period is to receive a data signal,

wherein the fourth period is for the light emission element to emit a light, and

wherein the first through fourth periods are included in an operation period and are different from each other.

4. The pixel circuit of claim 3 , further comprising:

a first transistor including a first electrode which receives a third voltage, a second electrode electrically coupled to the light emission element, and a gate electrode which receives a fourth signal,

wherein the first transistor is turned on in the first period, in the second period, and in the third period and is turned off in the fourth period in response to the fourth signal.

5. The pixel circuit of claim 4 , wherein the third transistor is turned on in the first period and in the second period and is turned off in the third period and in the fourth period in response to the second signal.

6. The pixel circuit of claim 5 , wherein the switching transistor transfers the data signal in response to the third signal such that the data signal is stored in the storage capacitor.

7. The pixel circuit of claim 6 , wherein the storage capacitor further stores the threshold voltage of the driving transistor in the second period.

8. The pixel circuit of claim 5 , wherein the switching transistor is turned on in the third period in response to the third signal.

9. The pixel circuit of claim 1 , wherein the second electrode of the storage capacitor is electrically coupled to the light emission element through an additional capacitor, and

wherein the second electrode of the switching transistor is electrically coupled to the first electrode of the driving transistor through the additional capacitor.

10. The pixel circuit of claim 1 , further comprising:

a first transistor including a first electrode which receives a third voltage, a second electrode electrically coupled to the light emission element, and a gate electrode which receives a fourth signal.

11. The pixel circuit of claim 10 , wherein the third voltage is equal to or lower than a threshold voltage of the light emission element.

12. A pixel circuit comprising:

a light emission element;

a driving transistor including a first electrode electrically coupled to the light emission element, a second electrode electrically coupled to a line transferring a power voltage, and a gate electrode;

a third transistor including a first electrode electrically coupled to the second electrode of the driving transistor, a second electrode electrically coupled to the gate electrode of the driving transistor, and a gate electrode which receives a second signal;

a storage capacitor including a first electrode and a second electrode, one of the first electrode and the second electrode of the storage capacitor electrically coupled to the gate electrode of the driving transistor; and

a switching transistor including a first electrode, a second electrode, and a gate electrode which receives a third signal, one of the first electrode and the second electrode of the switching transistor electrically coupled to a data line.

13. The pixel circuit of claim 12 , further comprising:

a second transistor including a first electrode electrically coupled to the line transferring the power voltage, a second electrode electrically coupled to the second electrode of the driving transistor, and a gate electrode which receives a first signal,

wherein the second electrode of the driving transistor is electrically coupled to the line transferring the power voltage through the second transistor.

14. The pixel circuit of claim 13 , wherein the second transistor is turned on in a first period and in a fourth period and is turned off in a second period and in a third period in response to the first signal,

wherein the first period is to initialize a voltage at the first electrode of the storage capacitor and the gate electrode of the driving transistor,

wherein the second period is to compensate a threshold voltage of the driving transistor,

wherein the third period is to receive a data signal,

wherein the fourth period is for the light emission element to emit a light, and

wherein the first through fourth periods are included in an operation period and are different from each other.

15. The pixel circuit of claim 14 , further comprising:

a first transistor including a first electrode which receives a third voltage, a second electrode electrically coupled to the light emission element, and a gate electrode which receives a fourth signal,

wherein the first transistor is turned on in the first period, in the second period, and in the third period and is turned off in the fourth period in response to the fourth signal.

16. The pixel circuit of claim 15 , wherein the third transistor is turned on in the first period and in the second period and is turned off in the third period and in the fourth period in response to the compensation control signal.

17. The pixel circuit of claim 12 , further comprising:

a fifth transistor including a gate electrode which receives a first signal,

wherein the second electrode of the storage capacitor is electrically coupled to the light emission element through the fifth transistor, and

wherein the second electrode of the switching transistor is electrically coupled to the first electrode of the driving transistor through the fifth transistor.

18. The pixel circuit of claim 12 , further comprising:

a first transistor including a first electrode which receives a third voltage, a second electrode electrically coupled to the light emission element, and a gate electrode which receives a fourth signal.