Active matrix substrate, method for fabricating the same, and display device

A display device, comprising:

• a first substrate;
• a second substrate disposed to face the first substrate;
• a frame-shaped sealing member disposed between the first substrate and the second substrate, and bonding the first substrate and the second substrate together;
• a display region provided within a frame-shaped sealing region in which the sealing member is provided;
• a frame-shaped non-display region formed outside the display region, and including the sealing region, wherein
• the first substrate includes:
• an insulating substrate;
• an electrode layer formed on the insulating substrate within the display region;
• a mark disposed on the insulating substrate within the non-display region, and made of a same material as the electrode layer;
• a first insulating film directly covering each of the electrode layer and the mark;
• and
• a second insulating film covering a part of the first insulating film, wherein
• within at least a part of the sealing region, the second insulating film is not provided on the insulating substrate,
• within the at least the part of the sealing region, the first insulating film is not provided in a region where the mark is not disposed,
• the mark is disposed in the at least the part of the sealing region in which the second insulating film is not provided, and is provided to overlap the at least the part of the sealing region, and
• a protective film is formed on the insulating substrate to cover a side surface and a surface of the first insulating film covering the mark, the surface of the first insulating film being a closest surface to the second substrate and located opposite from the insulating substrate.