Patent ID: 7704810

Claim:
A manufacturing method of a display device, comprising the steps of: forming a semiconductor film above a substrate; and implanting an impurity to each of a first semiconductor film in a first region of the substrate, a second semiconductor film in a second region outside the first region, and a third semiconductor film in a third region outside the first and second regions, wherein the implanting step includes the steps of: (a) forming a first resist above the substrate so as to be thicker in the first region than in the second region, the first resist covering the first and second regions and having an opening in the third region; (b) implanting an impurity to only the third semiconductor film in the third region using the first resist as a mask; (c) thinning the first resist so as to form a second resist that covers the first region and has an opening in each of second and third regions; (d) implanting an impurity to the second and third semiconductor films in the second and third regions simultaneously using the second resist as a mask; (e) implanting an impurity to the first to third semiconductor films in the first to third regions simultaneously; and (f) forming a capacitor in the third region.