Patent ID: 8227803

Claim:
An organic electroluminescent display device comprising: at least one switching transistor and driving transistor formed on a array substrate, wherein the array substrate includes a gate pad and a date pad formed thereon; a passivation layer having a plurality of a first contact holes to expose a portion of a drain electrode of the driving transistor, a gate pad bottom electrode of the gate pad and a date pad bottom electrode of the data pad respectively; a contact electrode, a gate pad top electrode of the gate pad and a data pad top electrode of the data pad formed on the passivation layer, the contact electrode, a top gate pad electrode and a top data pad electrode electrically connected to the exposed portion of the drain electrode of the driving transistor, the gate pad bottom electrode and the date pad bottom electrode respectively, a planarization layer formed on the passivation layer, the planarization layer including a plurality of a second contact holes to expose a portion of the contact electrode, the gate pad top electrode and the data pad top electrode respectively; a light-emitting cell including a cathode electrode, an anode electrode and an organic layer interposed therebetween formed on the planarization layer; wherein the cathode electrode is electrically connected to the contact electrode via one of the contact hole; wherein the contact electrode has acid-resistance with respect to an etchant used in patterning the cathode electrode.