Patent ID: 7573469

Claim:
A display device comprising: an insulating surface; a pixel portion over the insulating surface, comprising: a plurality of gate signal lines and a plurality of source signal lines arranged in a matrix; a plurality of power source lines arranged in parallel with the source signal lines; and a plurality of pixels each comprising an electro luminescence element; a plurality of lead-out signal lines, wherein each of the lead-out signal lines is electrically connected to a corresponding one of the gate signal lines; a gate driver over the insulating surface and electrically connected to the lead-out signal lines; and a source driver over the insulating surface and electrically connected to the source signal lines, wherein each of the pixels is electrically connected to a corresponding one of the gate signal lines, to a corresponding one of the source signal lines, and to a corresponding one of the power source lines, wherein the gate driver is arranged in one direction chosen out of four directions which are above, below, left and right, with respect to the pixel portion, wherein the source driver is arranged in any one of the one direction and a direction opposite to the one direction, and wherein the plurality of gate signal lines turn orthogonally.