Patent ID: 8648382

Claim:
A planar light emitting device, comprising: a transparent substrate that is quadrilateral in plan view; and an organic EL element formed on a first surface side of the transparent substrate, wherein the organic EL element comprises: a planar anode comprising a transparent conductive film formed on the first surface side of the transparent substrate, said anode being quadrilateral in plan view; an organic layer which is formed on the opposite side of the planar anode from the transparent substrate and comprises at least a light emitting layer, said organic layer being quadrilateral in plan view; a planar cathode which is formed on the opposite side of the planar anode in the organic layer and is opposed to the planar anode, said cathode being quadrilateral in plan view; an anode feeding part which is formed on the first surface side of the transparent substrate and electrically connected to the planar anode; a cathode feeding part which is formed on the first surface side of the transparent substrate and electrically connected to the planar cathode; an anode auxiliary electrode which is formed at the whole circumference of the opposite surface of the planar anode from the transparent substrate and electrically connected to the planar anode, said anode auxiliary electrode being in the shape of a quadrilateral frame; and an anode feeding auxiliary electrode which is integrally and continuously formed to the anode auxiliary electrode and laminated on the anode feeding part, wherein a light emitting part is formed of a region where the only organic layer intervenes between the planar anode and the planar cathode, the plane shape of the light emitting part being quadrilateral, two distances between predetermined two parallel sides of the four sides of the light emitting part and outer circumferential edges of the transparent substrate on sides adjacent to the two parallel sides, respectively, being smaller than two distances between the other two parallel sides and the outer circumferential edges of the transparent substrate on sides adjacent to the other two parallel sides, respectively, and wherein the cathode feeding part and the anode feeding part are located along said other two parallel sides of the light emitting part in plan view, and the anode feeding part is located at each side, in a width direction, of the cathode feeding part.