Patent ID: 7696079

Claim:
A method for patterning films, comprising: providing a substrate on which a first film is formed; forming a plurality of recesses and openings in the first film at the same time, each recess comprising an under-cut profile and completely passes through the whole first film, wherein the method for forming the openings and recesses comprises: forming a photoresist layer on the first film; providing a mask, which comprises an opaque area, a transparent area and a semitransparent area; patterning the photoresist layer through a photolithography process with the mask and then partially exposing the first film where is predetermined to form the recesses; partially removing the photoresist layer and the first film that correspond to the semitransparent area, as well as the first film so as to form the recesses and the openings; removing the photoresist layer; and forming a second film on the first film, wherein the second film fills the openings and the second film on the first film is separated from the second film formed at the recesses so as to form a plurality of patterns on the first film.