An organic light emitting display that is capable of preventing
degradation of picture quality, and a method of manufacturing the organic
light emitting display are provided. A unit pixel for the organic light
emitting display, includes a first transistor coupled to a data line and
having a first voltage threshold, a second transistor coupled to the
first and third transistors and controlled by a second select signal, a
third transistor coupled to the first transistor and controlled by a
first select signal, and a fourth transistor coupled to the third
transistor and having a fourth voltage threshold such that a drive
current of the fourth transistor is controlled independent of the fourth
voltage threshold.