Organic electroluminescent display and method of fabricating the same

A method of fabricating an organic electroluminescent display comprising an organic light-emitting diode, two or more thin film transistors, and a storage capacitor that are disposed in each of a plurality of pixels, the method comprising:

• forming an active layer of a switching thin film transistor and an active layer of a driving thin film transistor on a substrate;
• forming an insulating layer on the substrate and on the active layer of the switching thin film transistor and the active layer of the driving thin film transistor;
• forming a metal layer on the insulating layer and patterning the metal layer to form a lower electrode of the storage capacitor, a gate corresponding to the active layer of the switching thin film transistor, and a gate corresponding to the active layer of the driving thin film transistor;
• doping both end portions of each of the active layer of the switching thin film transistor and the active layer of the driving thin film transistor, which are not overlapped by the gates, to form a source and a drain in both of the end portions;
• forming an interlayer dielectric layer on the gate of the switching thin film transistor, the gate of the driving thin film transistor, and the lower electrode of the storage capacitor, the interlayer dielectric layer comprising two or more insulating layers;
• etching at least an uppermost insulating layer of the interlayer dielectric layer, but not a lowermost insulating layer, to form contact holes in at least the uppermost insulating layer on the source and drain of the thin film transistors, and a contact hole on the lower electrode;
• forming a protective layer on the lowermost insulating layer over the storage capacitor and in the contact hole on the lower electrode and then forming contact holes in portions of the lowermost insulating layer exposing the source and drain of the thin film transistors;
• and
• forming a metal layer on the gate and the interlayer dielectric layer and patterning the metal layer to form electrodes, which are connected to the source and the drain of the active layer of the switching thin film transistor and the source and drain of the active layer of the driving thin film transistor, and an upper electrode corresponding to the lower electrode of the storage capacitor.

A display comprising:

• a substrate;
• portions of a thin film transistor formed on the substrate;
• a first electrode of a storage capacitor formed on the substrate;
• an interlayer dielectric layer formed on the portions of the thin film transistor and on the first electrode of the storage capacitor, a first region of the interlayer dielectric layer on the portions of the thin film transistor having a first thickness and a second region of the interlayer dielectric layer on the first electrode having a second thickness, the second thickness less than the first thickness;
• and,
• a second electrode of the storage capacitor formed on the second region of the interlayer dielectric layer and overlapping the first electrode.