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