Patent ID: 8421941

Claim:
A TFT substrate comprising: a gate electrode having a thick film part and a thin film part with a smaller film thickness than the thick film part; a semiconductor active film formed above the thick film part and the thin film part of the gate electrode; an ohmic contact film formed on an inside of the semiconductor active film and on the semiconductor active film corresponding to the thin film part on an outside of the thick film part; and an electrode film constituting a source electrode and a drain electrode, having a planar shape identical to or on an inside of the ohmic contact film, and formed on the ohmic contact film, wherein the semiconductor active film includes a step portion formed due to the shape of each of the thick film part and the thin film part, and the ohmic contact film is formed on the semiconductor active film that is not opposed to the step portion and the thick film part so that the semiconductor active film opposed to the thick film part and the step portion serve as a channel region.