Pixel circuit and display device including the same

1. A pixel circuit comprising:

a light emitting element;

a write transistor that applies a data voltage to a first electrode of a first driving transistor in response to a first gate signal;

the first driving transistor that transmits a first driving current determined based on the data voltage to a gate electrode of a second driving transistor;

a compensation transistor that diode-connects the first driving transistor in response to the first gate signal;

the second driving transistor that transmits a second driving current determined based on the first driving current to the light emitting element;

a first initialization transistor that applies a first initialization voltage to a gate electrode of the first driving transistor in response to a second gate signal;

a second initialization transistor that applies a second initialization voltage to the gate electrode of the second driving transistor in response to the first gate signal;

a sensing transistor that receives the second driving current in response to a third gate signal;

a first capacitor including a first electrode receiving a sweep voltage and a second electrode connected to the gate electrode of the first driving transistor; and

a second capacitor including a first electrode receiving a first power voltage and a second electrode connected to the gate electrode of the second driving transistor.

2. The pixel circuit of claim 1 , wherein

the sweep voltage has a waveform which gradually decreases to be at an inactive level, and

the first driving transistor applies the first power voltage to the gate electrode of the second driving transistor in case that the sweep voltage is at the inactive level.

3. The pixel circuit of claim 2 , wherein the second driving transistor turns off in case that the first driving transistor applies the first power voltage to the gate electrode of the second driving transistor.

4. The pixel circuit of claim 1 , wherein the sensing transistor applies a third initialization voltage to an anode electrode of the light emitting element in response to the third gate signal.

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

a first emission transistor that applies the first power voltage to the first electrode of the first driving transistor in response to a first emission signal; and

a second emission transistor that connects the first driving transistor and the second driving transistor in response to the first emission signal.

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

a third emission transistor that applies the first power voltage to a first electrode of the second driving transistor in response to a second emission signal.

7. The pixel circuit of claim 1 , wherein the compensation transistor, the first initialization transistor, and the second driving transistor are of a same type.

8. The pixel circuit of claim 7 , wherein the compensation transistor, the first initialization transistor, and the second driving transistor are a P-type transistor.

9. A pixel circuit comprising:

a light emitting element;

a write transistor that applies a data voltage to a first electrode of a first driving transistor in response to a first gate signal;

the first driving transistor that transmits a first driving current determined based on the data voltage to a gate electrode of a third emission transistor;

a compensation transistor that diode-connects the first driving transistor in response to a fourth gate signal;

a first initialization transistor that applies a first initialization voltage to a gate electrode of the first driving transistor in response to a second gate signal;

a second initialization transistor that applies a second initialization voltage to the gate electrode of a second driving transistor in response to the first gate signal;

the second driving transistor that transmits a second driving current determined based on a voltage of a second electrode of the second initialization transistor to the light emitting element;

a sensing transistor that receives the second driving current in response to a third gate signal;

a first capacitor including a first electrode receiving a sweep voltage and a second electrode connected to the gate electrode of the first driving transistor; and

a second capacitor including a first electrode connected to the gate electrode of the second driving transistor and a second electrode connected to a second electrode of the second driving transistor.

10. The pixel circuit of claim 9 , wherein

the sweep voltage has a waveform which gradually decreases to be at an inactive level, and

the first driving transistor applies a first power voltage to the gate electrode of the third emission transistor in case that the sweep voltage is at the inactive level.

11. The pixel circuit of claim 10 , wherein the third emission transistor turns off in case that the first driving transistor applies the first power voltage to the gate electrode of the third emission transistor.

12. The pixel circuit of claim 9 , wherein the sensing transistor applies a third initialization voltage to an anode electrode of the light emitting element in response to the third gate signal.

13. The pixel circuit of claim 9 , further comprising:

a first emission transistor that applies a first power voltage to the first electrode of the first driving transistor in response to a first emission signal; and

a second emission transistor that connects the first driving transistor and the second driving transistor in response to the first emission signal.

14. The pixel circuit of claim 9 , wherein the compensation transistor, the first initialization transistor, and the second driving transistor are of a same type.

15. The pixel circuit of claim 14 , wherein the compensation transistor, the first initialization transistor, and the second driving transistor are an N-type transistor.

16. A display device comprising:

a display panel including a pixel circuit; and

a display panel driver that drives the display panel, wherein the pixel circuit comprises:

a light emitting element;

a write transistor that applies a data voltage to a first electrode of a first driving transistor in response to a first gate signal;

the first driving transistor that transmits a first driving current determined based on the data voltage to a gate electrode of a second driving transistor;

a compensation transistor that diode-connects the first driving transistor in response to the first gate signal;

the second driving transistor that transmits a second driving current determined based on the first driving current to the light emitting element;

a first initialization transistor that applies a first initialization voltage to a gate electrode of the first driving transistor in response to a second gate signal;

a second initialization transistor that applies a second initialization voltage to the gate electrode of the second driving transistor in response to the first gate signal;

a sensing transistor that receives the second driving current in response to a third gate signal;

a first capacitor including a first electrode receiving a sweep voltage and a second electrode connected to the gate electrode of the first driving transistor; and

a second capacitor including a first electrode receiving a first power voltage and a second electrode connected to the gate electrode of the second driving transistor.

17. The display device of claim 16 , wherein

the sweep voltage has a waveform which gradually decreases to be at an inactive level, and

the first driving transistor applies the first power voltage to the gate electrode of the second driving transistor in case that the sweep voltage is at the inactive level.

18. The display device of claim 17 , wherein the second driving transistor turns off in case that the first driving transistor applies the first power voltage to the gate electrode of the second driving transistor.

19. The display device of claim 16 , wherein the sensing transistor applies a third initialization voltage to an anode electrode of the light emitting element in response to the third gate signal.

20. The display device of claim 16 , wherein the pixel circuit further comprises:

a first emission transistor that applies the first power voltage to the first electrode of the first driving transistor in response to a first emission signal; and

a second emission transistor that connects the first driving transistor and the second driving transistor in response to the first emission signal.

21. An electronic device comprising:

a display panel including a pixel circuit;

a display panel driver that drives the display panel; and

a processor that controls the display panel driver, wherein the pixel circuit comprises:

a light emitting element;

a write transistor that applies a data voltage to a first electrode of a first driving transistor in response to a first gate signal;

the first driving transistor that transmits a first driving current determined based on the data voltage to a gate electrode of a second driving transistor;

a compensation transistor that diode-connects the first driving transistor in response to the first gate signal;

the second driving transistor that transmits a second driving current determined based on the first driving current to the light emitting element;

a first initialization transistor that applies a first initialization voltage to a gate electrode of the first driving transistor in response to a second gate signal;

a second initialization transistor that applies a second initialization voltage to the gate electrode of the second driving transistor in response to the first gate signal;

a sensing transistor that receives the second driving current in response to a third gate signal;

a first capacitor including a first electrode receiving a sweep voltage and a second electrode connected to the gate electrode of the first driving transistor; and

a second capacitor including a first electrode receiving a first power voltage and a second electrode connected to the gate electrode of the second driving transistor.