Construction of driving transistor in a pixel of a display device

1. A display device comprising a pixel which is connected to a scan line and a data line intersecting the scan line,

wherein:

the pixel comprises a light emitting element and a driving transistor controlling a driving current, which is supplied to the light emitting element, according to a data voltage received from the data line, wherein the driving transistor comprises a first active layer having an oxide semiconductor containing tin (Sn); and

the oxide semiconductor comprises at least one first oxide layer containing Sn and at least one second oxide layer containing indium (In).

2. The display device of claim 1 , wherein content of the Sn in the oxide semiconductor ranges from about 10 wt. % to about 16 wt. %.

3. The display device of claim 2 , wherein the Sn is dispersed in the oxide semiconductor.

4. The display device of claim 2 , wherein the oxide semiconductor comprises indium-tin oxide (ITO), indium-zinc-tin oxide (IZTO), indium-gallium-tin oxide (IGTO), or indium-gallium-zinc-tin oxide (IGZTO).

5. The display device of claim 1 , wherein the oxide semiconductor has a structure in which the first oxide layer and the second oxide layer are alternately stacked.

6. The display device of claim 1 , wherein the oxide semiconductor further comprises at least one third oxide layer containing zinc (Zn) and has a structure in which the first through third oxide layers are stacked in one direction.

7. The display device of claim 6 , wherein the first active layer comprises a first surface in one direction and a second surface located opposite the first surface, and a content of the Sn in an area adjacent to the first surface and the content of the Sn in an area adjacent to the second surface have different values.

8. The display device of claim 7 , wherein the content of the Sn in the first active layer decreases linearly from the first surface toward the second surface.

9. The display device of claim 1 , wherein the first active layer comprises a first conducting region, a second conducting region, and a channel region disposed between the first conducting region and the second conducting region.

10. A display device comprising a pixel which is connected to a scan line and a data line intersecting the scan line,

wherein:

the pixel comprises a light emitting element and a driving transistor controlling a driving current, which is supplied to the light emitting element, according to a data voltage received from the data line, wherein the driving transistor comprises a first active layer having an oxide semiconductor containing tin (Sn);

the first active layer comprises a first conducting region, a second conducting region, and a channel region disposed between the first conducting region and the second conducting region; and

the driving transistor further comprises:

a first light shielding layer disposed under the first active layer;

a first gate electrode disposed on the first active layer;

a first source electrode connected to the first conducting region through a first contact hole defined through an interlayer insulating layer disposed on the first gate electrode; and

a first drain electrode connected to the second conducting region through a second contact hole defined through the interlayer insulating layer.

11. The display device of claim 10 , wherein the pixel comprises a scan transistor for applying the data voltage of the data line to a gate electrode of the driving transistor according to a scan signal transmitted to the scan line, wherein the scan transistor comprises a second active layer having an oxide semiconductor containing Sn.

12. The display device of claim 11 , wherein content of the Sn in the second active layer ranges from about 10 wt. % to about 16 wt. %.