A thin film transistor includes a substrate with {HEAD ~ a trench} having first and second sides and a bottom, and {TAIL ~ a gate electrode} at one of the first and second sides of the trench 
A thin film transistor includes a substrate with { HEAD ~ a trench } having first and second sides and a bottom , and { TAIL ~ a gate electrode } at one of the first and second sides of the trench
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH