An organic light emitting diode (OLED) display device and a method of fabricating the same are provided. When an organic layer having an emission layer (EML) is formed using a deposition mask, damage to a pixel defining layer due to inconsistencies or unevenness of the deposition mask is prevented or reduced using spherical spacers disposed on the pixel defining layer. A plurality of spherical spacers are applied on the pixel defining layer prior to forming an opening in the pixel defining layer exposing the first electrode. An organic layer having an emission layer (EML) is formed on the first electrode at the opening by using a deposition mask. The spherical spacers prevent or reduce damage to the pixel defining layer caused by inconsistencies or unevenness in the deposition mask by maintaining a spacing between the pixel defining layer and the deposition mask.