Organic light-emitting display apparatus and photomask for manufacturing the same
A semiconductor device includes a semiconductor layer over a substrate. The semiconductor layer changes direction at least twice and has at least two different widths in the same plane. The length of a current path through the semiconductor layer is greater than a shortest path through the semiconductor layer in the same plane.
1. A display apparatus comprising:
a switching thin-film transistor (TFT) on a substrate and connected to a scan line and a data line;
a driving TFT connected to the switching TFT; and
a display device connected to the driving TFT, wherein the driving TFT includes a driving semiconductor layer which includes:
a first region extending in a first direction;
a first curved portion curved at an end of the first region and which changes direction;
a second region extending in a second direction and having an end connected to the first curved portion;
a third region extending in the second direction;
a second curved portion curved at an end of the third region and which changes direction;
a fourth region extending in the first direction and having an end connected to the second curved portion; and
a connecting region to connect the second and third regions, and wherein widths of the second and third regions are narrower than widths of the first and fourth regions.
2. The apparatus as claimed in claim 1 , wherein the widths of the first and fourth regions are substantially equal.
3. The apparatus as claimed in claim 1 , wherein the widths of the second and third regions are substantially equal.
4. The apparatus as claimed in claim 1 , wherein the connecting region includes a region extending in the first direction.
5. The apparatus as claimed in claim 1 , wherein the connecting region extends to form an obtuse angle relative to each of the second and third regions.
6. The apparatus as claimed in claim 1 , wherein:
each of the first and second curved portions includes an inner corner corresponding to an outer corner, and
a radius of curvature of the outer corner is greater than a radius of curvature of the inner corner.
7. The apparatus as claimed in claim 1 , wherein lengths of the first and fourth regions are longer than lengths of the second and third regions.
8. The apparatus as claimed in claim 1 , further comprising:
a first semiconductor pattern connected to another end of the first region and extending in the second direction; and
a second semiconductor pattern connected to another end of the fourth region and extending in the second direction.
9. The apparatus as claimed in claim 8 , wherein a distance between the first semiconductor pattern and the third region is substantially equal to a distance between the second semiconductor pattern and the second region.
10. The apparatus as claimed in claim 1 , further comprising:
a first insulating film on the substrate and overlapping the driving semiconductor layer; and
a capacitor on the first insulating film and overlapping the driving semiconductor layer.
11. The apparatus as claimed in claim 10 , wherein the capacitor comprises:
a first electrode on the first insulating film, overlapping the driving semiconductor layer, and performing functions of a driving gate electrode;
a second insulating film overlapping the first electrode; and
a second electrode on the second insulating film and overlapping the first electrode.
12. The apparatus as claimed in claim 1 , wherein the display device is an organic light-emitting device which includes an organic emission layer between first and second electrodes.
13. A semiconductor device, comprising:
a substrate; and
a semiconductor layer including:
a first region extending in a first direction;
a first curved portion curved at an end of the first region and which changes direction;
a second region extending in a second direction and having an end connected to the first curved portion;
a third region extending in the second direction;
a second curved portion curved at an end of the third region and which changes direction;
a fourth region extending in the first direction and having an end connected to the second curved portion; and
a connecting region to connect the second and third regions, and wherein widths of the second and third regions are narrower than widths of the first and fourth regions.