Patent ID: 7476899

Claim:
An active matrix substrate, comprising: a transparent insulating substrate; a switching element formed on the transparent insulating substrate; a scanning line extraction wiring and a signal line extraction wiring attached to the switching element, each of the extraction wirings extending onto a same side of the transparent insulating substrate and having a terminal portion in a tip end thereof that is distal from the switching element, such that the terminal portions are arranged to be located on an elongated region extending along one peripheral end of the side of the transparent insulating substrate; a first interlayer insulating film formed on the transparent insulating substrate to cover the scanning line extraction wiring and the signal line extraction wiring; a contact hole penetrating through the first interlayer insulating film and being formed on each of the terminal portion of the scanning line extraction wiring and the signal line extraction wiring, the contact hole being used for connecting a driving device for driving a scanning line and a signal line of the switching element; and a semiconductor film pattern, serving as a moisture barrier, formed on the first interlayer insulating film, the semiconductor film pattern covering the scanning line extraction wiring and the signal line extraction wiring in the vicinity of the terminal portion thereof, the semiconductor film pattern comprising a same layer used to form a semiconductor layer of the switching element.