Patent ID: 7679088

Claim:
A thin-film transistor, comprising: a gate electrode positioned on a substrate; a gate insulating layer covering the gate electrode; a semiconductor island positioned on the gate insulating layer; a source electrode and a drain electrode positioned on two sides of the semiconductor island, the source electrode and the drain electrode being not connected to each other; a passivation layer covering the gate electrode, the gate insulating layer, the semiconductor island, the source electrode, the drain electrode, and the substrate; and a pixel electrode covering a portion of the passivation layer and the source electrode, electrically connecting the source electrode; wherein the sizes of the gate insulating layer and the gate electrode are approximately the same and are larger than the size of the semiconductor island so that the gate insulating layer and the gate electrode protrude from the two sides of the semiconductor island to form a stair structure respectively, and the passivation layer step covers the surfaces of the stair structures, wherein the passivation layer directly contacts portions of the gate electrode.