Display device

1. A thin film transistor substrate, comprising:

a substrate;

a scan line disposed on the substrate and extending along a first direction;

a semiconductor layer disposed on the scan line; and

a drain electrode disposed on the semiconductor layer and comprising an arc edge outside the scan line,

wherein a part of the semiconductor layer extends along a second direction perpendicular to the first direction and the arc edge overlaps the part of the semiconductor layer.

2. The thin film transistor substrate of claim 1 , wherein the drain electrode and the scan line are overlapped.

3. The thin film transistor substrate of claim 1 , further comprising a transparent conductive layer disposed on the substrate, wherein the arc edge is not overlapped with the transparent conductive layer, and the transparent conductive layer is at least partially overlapped with the semiconductor layer.

4. The thin film transistor substrate of claim 3 , wherein the transparent conductive layer comprises plural slits.

5. The thin film transistor substrate of claim 1 , wherein a projection of the drain electrode on the substrate is located in a projection of the semiconductor layer on the substrate.

6. The thin film transistor substrate of claim 1 , further comprising a source electrode disposed on the substrate, wherein a projection of the source electrode on the substrate is located in a projection of the semiconductor layer on the substrate.

7. The thin film transistor substrate of claim 1 , further comprising:

a counter substrate opposite to the substrate;

a transparent conductive layer disposed on the substrate; and

a display medium layer disposed between the transparent conductive layer and the counter substrate.