Patent ID: 7911128

Claim:
An organic light emitting device comprising: a first substrate; a cathode on the first substrate, wherein the cathode comprises a transparent conductive material layer on the first substrate and a metal film formed on the transparent conductive material layer, and wherein the metal film transmits light incident from following organic electroluminescence (EL) layer and has a work function smaller than that of the following organic electroluminescence (EL) layer, and the cathode has a step; an organic electroluminescence (EL) layer on the metal film of the cathode, wherein the organic EL layer comprises an electron injection layer and an electron transfer layer that transmit electrons supplied from the cathode; a hole injection layer and a hole transfer layer that transmit holes supplied from an anode; and an organic light-emitting layer between the electron transfer layer and the hole transfer layer; the anode on the organic EL layer, the cathode disposed closer to the first substrate than the anode; a second substrate corresponding to the first substrate; and a driving transistor containing a drain electrode on the second substrate, wherein the drain electrode comes in contact with the anode to bond the first substrate and the second substrate to each other.