Pixel circuit and display device including the same
A pixel circuit may include a light-emitting element, a driving transistor which applies a driving current to the light-emitting element, a storage capacitor connected to a control electrode of the driving transistor, a data voltage-applying transistor which applies a data voltage to the storage capacitor, an emission transistor which connects the driving transistor to the light-emitting element in response to an emission signal, and a bias capacitor disposed between a first electrode of the driving transistor and a control electrode of the emission transistor.
1. A pixel circuit comprising:
a light-emitting element;
a driving transistor which applies a driving current to the light-emitting element and includes a control electrode and a first electrode;
a storage capacitor connected to the control electrode of the driving transistor;
a data voltage-applying transistor which is directly connected to the storage capacitor and directly applies a data voltage to the storage capacitor;
an emission transistor which connects the driving transistor to the light-emitting element in response to an emission signal and includes a control electrode; and
a bias capacitor disposed between the first electrode of the driving transistor and the control electrode of the emission transistor.
2. The pixel circuit of claim 1 , wherein the emission transistor is a P-type transistor.
3. The pixel circuit of claim 1 , wherein the light-emitting element includes an anode electrode, and
wherein the pixel circuit further comprises a light-emitting element initialization transistor which applies a first initialization voltage to the anode electrode of the light-emitting element.
4. The pixel circuit of claim 3 , wherein the light-emitting element initialization transistor applies the first initialization voltage to the anode electrode of the light-emitting element in response to the emission signal,
wherein the light-emitting element initialization transistor is an N-type transistor, and
wherein the emission transistor is a P-type transistor.
5. The pixel circuit of claim 1 , further comprising a data initialization transistor which applies a second initialization voltage to the control electrode of the driving transistor.
6. The pixel circuit of claim 1 , further comprising a threshold voltage compensation transistor disposed between the control electrode of the driving transistor and the first electrode of the driving transistor.
7. The pixel circuit of claim 1 , further comprising a reference voltage-applying transistor which applies a reference voltage to the storage capacitor.
8. The pixel circuit of claim 7 , wherein the driving transistor further includes a second electrode which receives a driving power voltage, and wherein the reference voltage is identical to the driving power voltage.
9. The pixel circuit of claim 7 , further comprising a threshold voltage compensation transistor disposed between the control electrode of the driving transistor and the first electrode of the driving transistor, and
wherein a control signal applied to a control electrode of the reference voltage-applying transistor is identical to a control signal applied to a control electrode of the threshold voltage compensation transistor.
10. A pixel circuit comprising:
a light-emitting element;
a driving transistor which applies a driving current to the light-emitting element and includes a control electrode and a first electrode;
a storage capacitor connected to the control electrode of the driving transistor;
a data voltage-applying transistor which is directly connected to the storage capacitor and directly applies a data voltage to the storage capacitor;
an emission transistor which connects the driving transistor to the light-emitting element in response to an emission signal; and
a bias capacitor including a first electrode which receives a bias signal and a second electrode connected to the first electrode of the driving transistor.
11. The pixel circuit of claim 10 , wherein the emission transistor is a P-type transistor.
12. The pixel circuit of claim 11 , wherein the bias signal rises from a low voltage level to a high voltage level while the emission signal has the high voltage level.
13. The pixel circuit of claim 10 , further comprising a light-emitting element initialization transistor which applies a first initialization voltage to an anode electrode of the light-emitting element.
14. The pixel circuit of claim 13 , wherein the light-emitting element initialization transistor applies the first initialization voltage to the anode electrode of the light-emitting element in response to the bias signal,
wherein the light-emitting element initialization transistor is an N-type transistor, and
wherein the emission transistor is a P-type transistor.
15. The pixel circuit of claim 10 , further comprising a data initialization transistor which applies a second initialization voltage to the control electrode of the driving transistor.
16. The pixel circuit of claim 10 , further comprising a threshold voltage compensation transistor disposed between the control electrode of the driving transistor and the first electrode of the driving transistor.
17. The pixel circuit of claim 10 , further comprising a reference voltage-applying transistor which applies a reference voltage to the storage capacitor.
18. The pixel circuit of claim 17 , wherein the driving transistor further includes a second electrode which receives a driving power voltage, and wherein the reference voltage is identical to the driving power voltage.
19. The pixel circuit of claim 17 , wherein the reference voltage-applying transistor comprises a control electrode,
wherein the pixel circuit further comprises a threshold voltage compensation transistor disposed between the control electrode of the driving transistor and the first electrode of the driving transistor, and
wherein a control signal applied to the control electrode of the reference voltage-applying transistor is identical to a control signal applied to a control electrode of the threshold voltage compensation transistor.
20. A display device comprising:
a display panel including pixels, each of the pixels comprising:
a light-emitting element;
a driving transistor which applies a driving current to the light-emitting element and includes a control electrode and a first electrode;
a storage capacitor connected to the control electrode of the driving transistor;
a data voltage-applying transistor which directly connected to the storage capacitor and directly applies a data voltage to the storage capacitor;
an emission transistor which connects the driving transistor to the light-emitting element in response to an emission signal; and
a bias capacitor connected to the first electrode of the driving transistor;
a gate driver which provides a gate signal to the pixels;
a data driver which provides the data voltage to the pixels;
an emission driver which provides the emission signal to the pixels; and
a driving controller which controls the gate driver, the data driver, and the emission driver.
21. The display device of claim 20 , wherein the bias capacitor includes a first electrode connected to a control electrode of the emission transistor and a second electrode connected to the first electrode of the driving transistor.
22. The display device of claim 20 , wherein the bias capacitor includes a first electrode which receives a bias signal and a second electrode connected to the first electrode of the driving transistor.