Patent ID: 8300168

Claim:
A display device comprising: a thin film transistor comprising: a gate electrode; a gate insulating film formed over the gate electrode; a microcrystalline semiconductor film formed over the gate insulating film, the microcrystalline semiconductor film comprising a channel formation region; an antioxidant film formed on the microcrystalline semiconductor film, the antioxidant film comprising an end portion and a recessed portion overlapping the channel formation region; a pair of semiconductor films formed over the antioxidant film, the pair of semiconductor films including an impurity element imparting one conductivity type; and a source electrode and a drain electrode formed over the pair of semiconductor films, wherein edges of the source electrode and the drain electrode are aligned with edges of the pair of semiconductor films, wherein an edge of the antioxidant film is aligned with an edge of the microcrystalline semiconductor film, wherein the source electrode and the drain electrode do not overlap with a horizontal upper surface of the end portion of the antioxidant film, wherein the microcrystalline semiconductor film has crystal grains with a diameter of 0.5 nm to 20 nm inclusive in an amorphous semiconductor, wherein a thickness of the microcrystalline semiconductor film is 1 nm to 300 nm inclusive, wherein a thickness of the antioxidant film is 1 nm to 100 nm inclusive, and wherein the antioxidant film includes silicon and nitrogen.