Patent ID: 7227229
Filing Date: 2007-06-05
Classification: H01L

Abstract:
1. An active matrix display device comprising: an undercoat film formed over a substrate; and an inverter circuit formed over the undercoat film, the inverter circuit having at least one pair of an N-channel thin film transistor and a P-channel thin film transistor electrically connected to the N-channel thin film transistor, wherein each of the N-channel and P-channel thin film transistors comprises a semiconductor layer having a channel region interposed between source and drain regions, and a gate electrode adjacent to the channel region with a gate insulating film interposed therebetween, and wherein a channel length of the P-channel thin film transistor is shorter than that of the N-channel thin film transistor, wherein a difference in the absolute value of the threshold voltage between the N-channel thin film transistor and the P-channel thin film transistor is 0.4V or less.