Patent ID: 8125415

Claim:
A display device comprising: a pixel over a substrate, the pixel comprising a transistor having a top gate structure; a plurality of gate signal lines over the substrate; a plurality of source signal lines over the substrate; a plurality of first power supply lines extending in a direction parallel to the plurality of gate signal lines over the substrate; and a plurality of second power supply lines extending in a direction parallel to the plurality of source signal lines over the substrate, wherein the plurality of first power supply lines and the plurality of second power supply lines cross with each other, wherein the plurality of first power supply lines are made from a same material as the plurality of gate signal lines, wherein the plurality of second power supply lines are made from a same material as the plurality of source signal lines, wherein one of the plurality of gate signal lines is electrically connected to a gate of the transistor, wherein one of the plurality of source signal lines is electrically connected to one of a source and a drain of the transistor, and wherein one of the plurality of first power supply lines is electrically connected to one of the plurality of second power supply lines.