To provide a display device having a novel structure.

The display device includes: an island-shaped electrode that can be electrically connected with a pixel electrode; and a signal line. The island-shaped electrode is electrically connected to one of the source region and drain region of a transistor. The signal line is electrically connected to the other of the source region and drain region of the transistor. The island-shaped electrode is formed through the same step as the one for etching the signal line.