Organic light emitting display apparatus and method of manufacturing the same

A method of manufacturing an organic light emitting display apparatus, the method comprising the steps of:

• forming an active layer on a substrate;
• sequentially stacking a first insulating layer on the active layer, a first layer comprising indium tin oxide (ITO) on the first insulating layer, a second layer comprising one of silver (Ag) and aluminum (Al), a third layer comprising ITO containing a pin hole, a fourth layer for protecting the third layer and comprising titanium (Ti), and a fifth layer;
• forming a gate electrode and a pixel electrode by patterning the first layer, the second layer, the third layer, the fourth layer, and the fifth layer, wherein the pixel electrode comprises a first electrode layer corresponding to the first layer, a second electrode layer corresponding to the second layer, a third electrode layer corresponding to the third layer, a fourth electrode layer corresponding to the fourth layer, and a fifth electrode layer corresponding to the fifth layer;
• forming a second insulating layer on a structure resulting from sequential stacking, and patterning the second insulating layer so as to expose the pixel electrode and the active layer;
• forming a metal layer on a structure resulting from the forming of the second insulating layer, patterning the metal layer by using a first etching solution so as to form source and drain electrodes contacting the active layer, and simultaneously etching the fifth electrode layer of the pixel electrode by using the first etching solution to expose the fourth electrode layer;
• etching a portion of the fourth electrode layer of the pixel electrode, which is exposed during the forming of the metal layer, by using a second etching solution to expose the third electrode layer;
• and
• forming a pixel defining layer on a structure resulting from etching so as to expose the third electrode layer of the pixel electrode.