Display device and method for manufacturing the same

A semiconductor device, comprising:

• a pixel portion comprising a transistor and a light emitting element electrically connected to the transistor, the transistor comprising:
• a semiconductor layer;
• a gate electrode over and overlap the semiconductor layer;
• and
• source and drain electrodes over and electrically connected to the semiconductor layer;
• and
• a protective circuit between the pixel portion and a driver circuit,
• wherein the semiconductor layer comprises a region which does not overlap any of the gate electrode, the source electrode, and the drain electrode,
• wherein a part of a gate wiring layer functions as the gate electrode,
• wherein the gate wiring layer comprises a first portion in the pixel portion and a second portion in the protective circuit,
• wherein the first portion and the second portion extend along a same direction, and
• wherein the first portion and the second portion do not extend in a same straight line.