Patent ID: 7888681

Claim:
A display device comprising: an n-channel thin film transistor comprising: a first gate electrode; a first gate insulating film formed over the first gate electrode; a first microcrystalline semiconductor film formed over the first gate insulating film; a first buffer layer formed over the first microcrystalline semiconductor film; a pair of n-type semiconductor films formed over the first buffer layer; and a pair of first wirings formed over the pair of n-type semiconductor films; and a p-channel thin film transistor comprising: a second gate electrode; a second gate insulating film formed over the second gate electrode; a second microcrystalline semiconductor film formed over the second gate insulating film; a second buffer layer formed over the second microcrystalline semiconductor film; a pair of p-type semiconductor films formed over the second buffer layer; and a pair of second wirings formed over the pair of p-type semiconductor films, wherein the first microcrystalline semiconductor film and the second microcrystalline semiconductor film each contain oxygen at a concentration of 1×10 16 atoms/cm 3 or less, wherein the pair of n-type semiconductor films include amorphous semiconductor or microcrystalline semiconductor, and wherein the pair of p-type semiconductor films include amorphous semiconductor or microcrystalline semiconductor.