Patent ID: 7446392

Claim:
An active matrix display device comprising: a plurality of first wirings extending in a first direction over a substrate; a plurality of second wirings extending in a second direction across the first direction over the substrate so as to form a matrix with the plurality of first wirings; a plurality of pixels defined by the plurality of first wirings and the plurality of second wirings; a thin film transistor formed in one of the plurality of pixels, the thin film transistor being electrically connected to one of the plurality of first wirings and one of the plurality of second wirings; and a pixel electrode electrically connected to the thin film transistor, wherein the one of the plurality of first wirings comprises aluminum and contains oxygen atoms at a concentration of 8×10 18 atoms/cm 3 or less, carbon atoms at a concentration of 5×10 18 atoms/cm 3 or less, and nitrogen atoms at a concentration of 7×10 17 atoms/cm 3 or less.