Patent ID: 8476744

Claim:
A thin film transistor, comprising: a gate electrode; a gate insulating layer covering the gate electrode; a semiconductor layer which is provided over the gate insulating layer and includes a microcrystalline semiconductor region and an amorphous semiconductor region on the microcrystalline semiconductor region; an impurity semiconductor layer on the semiconductor layer; a wiring on the impurity semiconductor layer; a first oxide region provided between a side face of the microcrystalline semiconductor region and the wiring; and a second oxide region provided between a side face of the amorphous semiconductor region and the wiring, wherein a line tangent to the highest inclination of an oxygen profile in the first oxide region (m1) and a line tangent to the highest inclination of an oxygen profile in the second oxide region (m2) satisfy a relation of 1<m1/m2<10, on the semiconductor layer side from an intersection of a profile of an element included in the wiring and a profile of an element included in the semiconductor layer.