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