Patent ID: 7208765

Claim:
An electronic device including a display device comprising a pixel, said pixel comprising: a first thin film transistor formed over a substrate; a second p-channel thin film transistor formed over said substrate, each of said first thin film transistor and said second p-channel thin film transistor comprising: a gate electrode electrically connected to an impurity region of the first thin film transistor; a gate insulating film; and a semiconductor film including at least a source region, a drain region, a channel region, an LDD region, a pixel electrode; a current supply line wherein the pixel electrode is electrically connected to the current supply line through the second p-channel thin film transistor, wherein at least a portion of the LDD region of the second p-channel thin film transistor is overlapped with the gate electrode with the gate insulating film interposed therebetween, and wherein a channel length of the first thin film transistor is 0.2 to 18 μm, a channel length of the second p-channel thin film transistor is 1 to 50 μm and a length of a portion of the LDD region, which is overlapped with the gate electrode is 0.1 to 3 μm.