Pixel and display device including the same
Provided herein may be a pixel. The pixel may include a driving transistor including a gate electrode coupled to a first node, a first electrode coupled to a first power line, and a second electrode coupled to a second node, a control transistor including a gate electrode coupled to the first node, a first electrode coupled to the second node, and a second electrode that is different from the first electrode, a first emission unit including at least one light-emitting element coupled between the second electrode of the control transistor and a second power line, and a second emission unit including at least one light-emitting element coupled between the second node and the second power line, wherein the second electrode of the control transistor is coupled to a first electrode of the first emission unit.
1. A pixel, comprising:
a driving transistor comprising a gate electrode electrically and directly coupled to a first node, a first electrode electrically coupled to a first power line, and a second electrode electrically coupled to a second node;
a control transistor comprising a gate electrode electrically and directly coupled to the first node, a first electrode electrically coupled to the second node, and a second electrode that is different from the first electrode;
a first emission unit comprising at least one light-emitting element electrically coupled between the second electrode of the control transistor and a second power line; and
a second emission unit comprising at least one light-emitting element electrically coupled between the second node and the second power line,
wherein the second electrode of the control transistor is electrically coupled to a first electrode of the first emission unit.
2. The pixel according to claim 1 , wherein the driving transistor controls a driving current flowing to the control transistor and to the second emission unit in response to a voltage of the first node.
3. The pixel according to claim 2 , wherein the driving current comprises a first driving current flowing through the control transistor and the first emission unit, and a second driving current flowing through the second emission unit.
4. The pixel according to claim 3 , wherein a magnitude of the first driving current and a magnitude of the second driving current are different from each other.
5. The pixel according to claim 3 , wherein a magnitude of the first driving current is less than a magnitude of the second driving current when the pixel is driven at a low grayscale level.
6. The pixel according to claim 1 , further comprising:
a first scan line through which a first scan signal is supplied;
a second scan line through which a second scan signal is supplied;
a data line through which a data voltage is supplied;
a sensing line through which a sensing voltage is supplied for a sensing period;
a switching transistor comprising a gate electrode electrically coupled to the first scan line, a first electrode electrically coupled to the data line, and a second electrode electrically coupled to the first node; and
a sensing transistor comprising a gate electrode electrically coupled to the second scan line, a first electrode electrically coupled to the sensing line, and a second electrode electrically coupled to the second node.
7. The pixel according to claim 1 , further comprising:
a first storage capacitor electrically coupled between the first node and the second node; and
a second storage capacitor electrically coupled between the first node and a first electrode of the first emission unit.
8. A display device, comprising:
a base layer;
a semiconductor layer on the base layer and comprising a first semiconductor and a second semiconductor;
a gate insulating layer covering the semiconductor layer;
a gate electrode layer on the gate insulating layer and comprising:
a first gate electrode, which partially overlaps the first semiconductor; and
a second gate electrode, which partially overlaps the second semiconductor, extends from the first gate electrode, is integrally formed with the first gate electrode, and is configured to receive a same signal as the first gate electrode;
an interlayer insulating layer covering the gate electrode layer; and
an upper electrode layer on the interlayer insulating layer and comprising a first source electrode electrically coupled to a source region of the first semiconductor, a first drain electrode electrically coupled to a drain region of the first semiconductor, and a second source electrode electrically coupled to a source region of the second semiconductor,
wherein the first semiconductor, the first gate electrode, the first source electrode, and the first drain electrode constitute a driving transistor, and
wherein the second semiconductor, the second gate electrode, the second source electrode, and the first source electrode constitute a control transistor.
9. The display device according to claim 8 , wherein the first source electrode extends from a drain electrode of the control transistor.
10. The display device according to claim 9 , wherein the second source electrode is electrically coupled to the source region of the second semiconductor through a contact hole of the gate insulating layer and the interlayer insulating layer, and
wherein the first source electrode is electrically coupled to a drain region of the second semiconductor through another contact hole of the gate insulating layer and the interlayer insulating layer.
11. The display device according to claim 8 , further comprising:
an overlapped metal layer on the base layer, and overlapping at least parts of the first semiconductor, the first gate electrode, and the first source electrode; and
a buffer layer covering the overlapped metal layer.
12. The display device according to claim 11 , wherein the overlapped metal layer is electrically coupled to the first source electrode through a contact hole of the buffer layer, the gate insulating layer, and the interlayer insulating layer.
13. The display device according to claim 8 , wherein the first source electrode is implemented as a first storage electrode, and
wherein the first storage electrode and the first gate electrode overlap each other, thereby constituting a first storage capacitor.
14. The display device according to claim 8 , further comprising:
a passivation layer covering the upper electrode layer; and
a first emission unit and a second emission unit on the passivation layer,
wherein the second source electrode is electrically coupled to a first electrode of the first emission unit through a contact hole of the passivation layer.
15. The display device according to claim 14 , wherein the first source electrode is electrically coupled to a first electrode of the second emission unit through another contact hole of the passivation layer.
16. A pixel, comprising:
a driving transistor comprising a gate electrode electrically and directly coupled to a first node, a first electrode electrically coupled to a first power line, and a second electrode electrically coupled to a second node;
a control transistor comprising a gate electrode electrically and directly coupled to the second node, a first electrode electrically coupled to the second node, and a second electrode that is different from the first electrode;
a first emission unit comprising at least one light-emitting element electrically coupled between the second electrode of the control transistor and a second power line; and
a second emission unit comprising at least one light-emitting element electrically coupled between the second node and the second power line,
wherein the second electrode of the control transistor is electrically coupled to a first electrode of the first emission unit.
17. The pixel according to claim 16 , wherein the driving transistor controls a driving current flowing to the control transistor and to the second emission unit in response to a voltage of the first node.
18. The pixel according to claim 17 , wherein the driving current comprises a first driving current flowing through the control transistor and the first emission unit, and a second driving current flowing through the second emission unit.
19. The pixel according to claim 18 , wherein a magnitude of the first driving current is less than a magnitude of the second driving current when the pixel is driven at a low grayscale level.