Patent ID: 7833910
Filing Date: 2010-11-16
Classification: G02F,H01L,H05K

Abstract:
1. A film substrate fabrication method for fabricating a film substrate, said method comprising: providing a film base material pre-formed with first conductor wiring comprising a semiconductor connection portion to be connected with a semiconductor element and an external connection portion on the film base material to be connected with another panel or substrate, the method subsequently comprising, sequentially: forming a photoresist on the surface of the film base material on which the first conductor wiring is formed; forming an opening and exposing a part of the first conductor wiring by removing the photoresist at a position of the external connection portion on the film base material and a position of the semiconductor connection portion; forming a second conductor wiring by performing metal plating on the first conductor wiring at the opening in the photoresist, whereby the photoresist remains on the surface of the film base material and on the surface of the first conductor wiring, and the surface of the second conductor wiring is exposed through the photoresist left on the surface of the first conductor wiring; and removing a first portion of the photoresist, other than the opening, and leaving a second portion of the photoresist, wherein the second portion of the photoresist is thinner than the first portion of the photoresist, thereby forming an insulating film of a photoresist which is thinner than the thicknesses of the external connection portion on the film base material and the semiconductor connection portion in a region other than the external connection portion on the film base material and the semiconductor connection portion.