US Patent 7888607 Thin film circuit board device

A thin film circuit board device includes: a first thin film circuit board having a first protrusion provided with a first conductive contact; a second thin film circuit board having a second protrusion provided with a second conductive contact; and an insulator film disposed between the first and second thin film circuit boards. The first and second protrusions are disposed one above the other. The insulator film is free of a portion that extends between the first and second protrusions. The first and second protrusions are folded together in such a manner that the first and second conductive contacts are brought into contact with each other at the fold thereof.