Patent ID: 7456427

Claim:
An active matrix display device comprising: a signal line formed over a substrate; a first thin film transistor having a first channel region interposed between a first pair of impurity regions, and a second pair of impurity regions between said first channel region and said first pair of impurity regions formed in a first semiconductor film over said substrate wherein a first gate electrode of said first thin film transistor is electrically connected to said signal line; a voltage supply line formed over said substrate; a second thin film transistor having a second channel region interposed between a third pair of impurity regions, and a fourth pair of impurity regions between said second channel region and said third pair of impurity regions formed in a second semiconductor film over said substrate wherein one of said second pair of impurity regions is electrically connected to said voltage supply line; and a pixel electrode formed over said substrate wherein said pixel electrode is electrically connected to another one of said second pair of impurity regions.