Patent ID: 7381987

Claim:
A driving circuit for a display device, comprising 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 comprising a first material formed on the control electrode and having a capacitance Csi and a resistance Rsi; a semiconductor layer comprising a second material formed on the first insulating layer and having a capacitance Ci and a resistance Ri; 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 is in a range from 0.3 to 1.5, wherein the first material of the first insulating layer and the second material of the semiconductor layer are chosen such that a relation of a voltage Vi over the first insulating layer and a voltage Vg applied to the control electrode satisfies the equation V i ⁡ ( t ) = V g ⁡ [ 1 - C i C Si + C i ⁢ exp ⁡ ( - t τ ) ] , τ = ( C Si + C i ) ⁢ ( 1 R Si + 1 ⁢ R i ) - 1 , where Csi and Rsi are the capacitance and the resistance of the semiconductor layer, respectively, Ci and Ri are the capacitance and the resistance of the first insulating layer, respectively, and τ is a time constant.