Patent ID: 7642141

Claim:
A manufacturing method for a display device including a substrate having formed thereon a first conductive type thin film transistor and a second conductive type thin film transistor, the method comprising the steps of: preparing a substrate having respective formation regions for a first conductive type thin film transistor and a second conductive type thin film transistor, in which a semiconductor layer, a first insulating film covering the semiconductor layer, and a gate electrode disposed on the first insulating film so as to intersect the semiconductor layer are formed and first conductive type impurity regions are formed on both outer sides of a channel region of the semiconductor layer below the gate electrode; forming a second insulating film on the substrate so as to also cover the gate electrode, and forming in the second insulating film and the first insulating film a contact hole used for connection between a drain electrode and a source electrode, the contact hole being formed so as not to expose the gate electrode in the formation region for the first conductive type thin film transistor and so as to partially expose each side of the gate electrode intersecting the semiconductor layer in the formation region for the second conductive type thin film transistor; forming the drain electrode and the source electrode using a multilayer conductive layer including an upper conductive layer and a lower conductive layer an outline of which protrudes outward from that of the upper conductive layer, the drain electrode and the source electrode being formed so as to cover each of the contact holes in the formation region for the first conductive type thin film transistor and so as to cover a portion of each of the contact holes facing the gate electrode in the formation region for the second conductive type thin film transistor; and forming by doping second conductive type impurities a second conductive type impurity region in the semiconductor layer having a portion having formed thereon none of the electrodes and having a portion having formed thereon only the lower conductive layer in each of the contact holes in the formation region for the second conductive type thin film transistor.