Patent ID: 8344612

Claim:
An organic electroluminescent device comprising: a first substrate; a second substrate; a thin film transistor on the first substrate; a insulation layer formed on the thin film transistor, and the insulation layer including a contact hole to expose a portion of a drain electrode of the thin film transistor; a light emitting diode comprising first and second electrodes and an organic luminescent layer on the first substrate; a buffer layer for separating the organic electroluminescent layer in a sub-pixel region; and first and second passivation layers on the first substrate on which the light emitting diode is formed, wherein the buffer layer is located on the first electrode and has a central region formed in an undercut shape for exposing the first electrode, wherein the buffer layer is located on the first electrode and has a central region formed in an undercut shape for exposing the first electrode; wherein the second electrode of the light emitting diode is electrically connected to the drain electrode of the thin film transistor via the contact hole, wherein the first and second passivation layers are contacted with each other in the buffer layer and the sub-pixel region, wherein the first electrode is formed with a first, second and third electrode layers and a contact pad and a power pad are formed at a region of the power line in the course of forming the third electrode layer, and wherein the first passivation layer further fully covers and is in direct contact with the power contact pad to prevent the power contact pad from being exposed to external air.