Thin film transistor, circuit device and liquid crystal display

摘要

A thin film transistor includes a one conductive type semiconductor layer; a source region and a drain region which are separately provided in the semiconductor layer; and a gate electrode provided above or below the semiconductor layer with an insulating film interposed therebetween, wherein the width of the junction face between the source region and the channel which is provided between the source region and drain region, is different from the width of the junction face between the above channel region and the drain region.