A thin film transistor is circular when viewed from top. A first source/drain region is disposed at the center, a semiconductor layer surrounds the first source/drain region and overlaps with an external periphery of the first source/drain region, and a second source/drain region surrounds the semiconductor...http://www.google.com.au/patents/US7038278?utm_source=gb-gplus-sharePatent US7038278 - Thin film transistor, image display device, and image display apparatus
