Patent ID: 7271411

Claim:
A light emitting device comprising: a substrate; a wiring connection portion over the substrate; a signal processing circuit over the substrate; a first barrier film over the substrate; a thin film transistor forming layer formed over the first barrier film; a second barrier film formed over the thin film transistor forming layer; a wiring forming layer formed over the second barrier film; a third barrier film formed over the wiring forming layer; a light emitting element forming layer formed over the third barrier film; and a fourth barrier film formed over the light emitting element forming layer, wherein the second barrier film is in contact with the first barrier film in a first opening formed in a part of the thin film transistor forming layer; wherein the signal processing circuit comprises a thin film transistor; wherein the wiring connection portion and at least a part of the signal processing circuit are located beside a same edge of the substrate; and wherein the signal processing circuit is formed in the exterior of an area in which the second barrier film is in contact with the first barrier film.