An array substrate includes a semiconductor layer, a first insulating film covering the semiconductor layer, a gate line extending in a first direction on the first insulating film, a second insulating film covering the gate line, a source line extending in a second direction orthogonally crossing the first direction on the second insulating film. A contact portion is formed on the second insulating film. The contact portion contacts with the semiconductor layer. A third insulating film covers the source line and exposing the contact portion and the second insulating film in a circumference of the contact portion.