Liquid crystal display device and electronic device provided with the same

A display device comprising:

• an electrode over a substrate;
• an insulating film over the electrode;
• a first semiconductor film over the insulating film, the first semiconductor film overlapping the electrode;
• a second semiconductor film over the insulating film, the second semiconductor film overlapping the electrode;
• a first conductive semiconductor film over the first semiconductor film;
• a second conductive semiconductor film over the second semiconductor film;
• a third conductive semiconductor film over the first semiconductor film and the second semiconductor film, the third conductive semiconductor film being in contact with the insulating film between the first semiconductor film and the second semiconductor film;
• a first conductive film over the first conductive semiconductor film;
• a second conductive film over the second conductive semiconductor film;
• and
• a third conductive film over the third conductive semiconductor film.

A display device comprising:

• an electrode over a substrate;
• an insulating film over the electrode;
• a first semiconductor film over the insulating film, the first semiconductor film overlapping the electrode;
• a second semiconductor film over the insulating film, the second semiconductor film overlapping the electrode;
• a third semiconductor film over the first semiconductor film;
• a fourth semiconductor film over the second semiconductor film;
• a fifth semiconductor film over the third semiconductor film;
• a sixth semiconductor film over the fourth semiconductor film;
• a seventh semiconductor film over the third semiconductor film and the fourth semiconductor film, the seventh semiconductor film being in contact with the insulating film between the third semiconductor film and the fourth semiconductor film;
• a first conductive film over the fifth semiconductor film;
• a second conductive film over the sixth semiconductor film;
• and
• a third conductive film over the seventh semiconductor film.

A display device comprising:

• an electrode over a substrate;
• a first insulating film over the electrode;
• a first semiconductor film over the first insulating film, the first semiconductor film overlapping the electrode;
• a second semiconductor film over the first insulating film, the second semiconductor film overlapping the electrode;
• a third semiconductor film over the first semiconductor film;
• a fourth semiconductor film over the second semiconductor film;
• a fifth semiconductor film over the third semiconductor film;
• a sixth semiconductor film over the fourth semiconductor film;
• a seventh semiconductor film over the third semiconductor film and the fourth semiconductor film, the seventh semiconductor film being in contact with the first insulating film between the third semiconductor film and the fourth semiconductor film;
• a first conductive film over the fifth semiconductor film;
• a second conductive film over the sixth semiconductor film;
• a third conductive film over the seventh semiconductor film;
• and
• a second insulating film over the first conductive film, the second conductive film and the third conductive film, the second insulating film being in contact with the third semiconductor film and the fourth semiconductor film.