Patent ID: 7714391

Claim:
A thin film transistor (TFT), comprising: an active layer formed of polycrystalline silicon; a source region in the active layer; a drain region in the active layer; a channel region in the active layer; and a gate electrode, wherein the active layer has at least two metal induced lateral crystallization (MILC) regions, the at least two MILC regions comprise a first MILC region and a second MILC region, the second MILC region is arranged between portions of the first MILC region, and the polycrystalline silicon of the second MILC region and the polycrystalline silicon of the first MILC region have different physical characteristics from each other, wherein the channel region and one of the drain region and the source region include the first MILC region but not the second MILC region, and wherein a grain size of the first MILC region is bigger than a grain size of the second MILC region.