Patent ID: 8446348

Claim:
A display device comprising: a pixel portion; a plurality of gate lines at least in the pixel portion; a plurality of wirings at least in the pixel portion, wherein the plurality of gate lines are parallel to the plurality of wirings; an insulating layer over the plurality of gate lines and the plurality of wirings; contact holes formed in the insulating layer; a plurality of source lines over the insulating layer; a plurality of current supply lines over the insulating layer, wherein the plurality of source lines are parallel to the plurality of current supply lines; a transistor comprising a gate electrically connected to one of the plurality of gate lines, one of a source and a drain electrically connected to one of the plurality of source lines; wherein one of the plurality of current supply lines is connected to one of the plurality of wirings through the contact holes at an intersection of one of the plurality of current supply lines and one of the plurality of wirings, wherein the plurality of current supply lines extend in a direction intersecting with the plurality of wirings, wherein the plurality of wirings are electrically connected to at least one terminal for inputting current.