Patent ID: 8269908

Claim:
A thin-film transistor, comprising: a gate electrode formed on a substrate; a gate insulator formed on the gate electrode; and a hydrogenated amorphous silicon film formed immediately above the gate insulator, wherein: the gate insulator comprises at least a first region being in contact with the hydrogenated amorphous silicon film, and a second region positioned below the first region; the first region and the second region are each formed of a silicon nitride film, wherein there are no other silicon nitride films disposed below the second region within the gate insulator; a composition ratio between nitrogen and silicon (N/Si) of the silicon nitride film of the first region is set in a range from 1.3 to 1.5; and a composition ratio between nitrogen and silicon (N/Si) of the silicon nitride film of the second region is set to be equal to or less than 1.0.