Patent ID: 8766260

Claim:
A thin-film transistor comprising: a substrate; a gate electrode above the substrate; a gate insulating film above the gate electrode; a crystalline silicon semiconductor layer above the gate insulating film; an amorphous silicon semiconductor layer above the crystalline silicon semiconductor layer; an organic protective film comprising an organic material and above the amorphous silicon semiconductor layer, the organic protective film containing a positive fixed charge; and a source electrode and a drain electrode above the amorphous silicon semiconductor layer interposing the organic protective film, wherein a thickness of the amorphous silicon semiconductor layer is at least 10 nm and at most 60 nm, a charge density of the amorphous silicon semiconductor layer is at least 1×10 17 cm −3 and at most 7×10 17 cm −3 , when measured by transition voltage spectroscopy, the charge density being of a negative charge.