US Patent 7381987 Driving circuit for display device

A driving circuit for a display device including a plurality of stages connected to each other and sequentially generating output signals, wherein each of the stages comprises a plurality of transistors, wherein each of the transistors comprises: a control electrode; a first insulating layer formed on the control electrode; a semiconductor layer formed on the first insulating layer; an input electrode, at least a portion of which formed on the semiconductor layer; an output electrode, at least a portion of which formed on the semiconductor layer; and a second insulating layer formed on the input and output electrodes, wherein a thickness ratio of the semiconductor layer to the first insulating layer ranges from 0.3 to 1.5.