An organic electroluminescent display includes a substrate having an array
portion with pixels, and a pad portion coupled to an external power
supply. A semiconductor structure is formed on the substrate with a
source electrode, a drain electrode and a pad. A passivation layer is
formed on the semiconductor structure with via holes exposing regions of
the source and the drain electrodes at the array portion and the pad at
the pad portion. Portions of the passivation layer contacting the via
holes between the array portion and the pad portion have the same
thickness. A conductive layer fills the via holes. A pixel defining layer
is formed over the entire surface of a flattening layer and the
conductive layer with pixel regions exposing regions of the conductive
layer at the array portion. An organic electroluminescent film is formed
at each pixel region.