Patent ID: 8586453

Claim:
A method for fabricating a thin film pattern, comprising: forming sequentially a first film and a second film on a substrate; applying a layer of photoresist on the second film; exposing and developing the photoresist layer with a double tone mask to form a photoresist pattern comprising a totally left region, a partially left region and a totally removed region; performing a first wet etching on the second film in the totally removed region; performing a first dry etching on the first film in the totally removed region to form a first pattern, and etching the photoresist layer to remove the photoresist in the partially left region and reduce the photoresist of the totally left region in thickness so as to expose the second film in the partially left region; performing a second wet etching on the second film in the partially left region; performing a second dry etching for etching entire or a part of the first film in the partially left region to form a second pattern; and removing the residual photoresist.