Patent ID: 8097329

Claim:
A thin film device comprising: a substrate; thin film elements formed on the substrate; an undercoat which covers the thin film elements and which is provided on a part of an area of the substrate, the undercoat having a layered structure in which a plurality of sequentially laminated insulative dry films are disposed over the thin film elements, each of the dry films comprising a photosensitive resin material; and a conductive thin film pattern comprising a sheet of film which covers an outer surface of the undercoat, and which covers at least a part of an area of the substrate on which the undercoat is not provided, wherein an end face of the undercoat which is on a side of the area of the substrate on which the undercoat is not formed is formed into a staircase shape, wherein a height of the undercoat with respect to the substrate reduces in stages as the undercoat approaches the side of the area of the substrate on which the undercoat is not formed, with a number of steps of the staircase shape being equal to a number of the sheets of the dry films, and wherein the thin film pattern covers the staircase-shaped end face of the undercoat.