Patent ID: 8059077

Claim:
A display device in which scanning signal lines, an insulation film, semiconductor layers, and conductor layers are sequentially stacked on a substrate, wherein the conductor layer includes a video signal line which intersects the scanning signal line via the insulation film, a drain electrode and a source electrode of a thin film transistor, and a connecting line which connects the video signal line and either one of the drain electrode and the source electrode, the semiconductor layer is formed so as to cover at least a region of the insulation film which is larger than a region where the video signal line and the connecting line are formed, an opening portion is formed in the scanning signal line such that the opening portion overlaps with a portion of the video signal line, the connecting line is connected with the video signal line over the opening portion, extends to the outside of the opening portion, and is connected to either one of the drain electrode and the source electrode, and a cutout portion, a projecting portion or an enlarged-width portion is formed on the video signal line and/or the connecting line in a region which corresponds to the opening portion or in the vicinity of the region.