Patent ID: 7439543
Filing Date: 2008-10-21
Classification: H01L

Abstract:
1. An electronic equipment having a display device comprising: a substrate; a pixel TFT only in a pixel portion which can display a picture over the substrate; a driving circuit over the substrate; an interlayer insulating film; and a pixel electrode, wherein the driving circuit is located outside the pixel portion, wherein the pixel TFT comprises: wherein the driving circuit comprises a thin film transistor, said thin film transistor comprising: wherein the interlayer insulating film covers the first, second and third gate electrodes and said first and second semiconductor islands, wherein the pixel electrode is formed over the interlayer insulating film and electrically connected to one of the source and drain regions of the first semiconductor island, and wherein each of the first, second and third gate electrodes has tapered edges with a taper angle in a range of 3° to 60°.