Patent ID: 7639248

Claim:
An EL display device comprising: a substrate; a pixel portion comprising: a first EL element over the substrate, comprising a first pixel electrode; a second EL element over the substrate, comprising a second pixel electrode; a first TFT over the substrate; a second TFT over the substrate; a first power supply line over the substrate electrically connected to the first pixel electrode via the first TFT; a second power supply line over the substrate electrically connected to the second pixel electrode via the second TFT; a first detour wiring configured to supply a first current to the first power supply line, and not to supply the first current to the second power supply line; and a second detour wiring configured to supply a second current to the second power supply line, and not to supply the second current to the first power supply line, wherein a current density of the first EL element is larger than a current density of the second EL element, wherein a width of the first detour wiring is larger than a width of the second detour wiring, and wherein a part of the first detour wiring and the second detour wiring is arranged in the periphery of the pixel portion.