An organic light emitting diode display includes a display substrate including organic light emitting diodes and a pixel defining layer having openings for defining respective light emitting regions of the organic light emitting diodes, an encapsulation substrate disposed to face the display substrate, a sealant disposed along the edge of the encapsulation substrate and bonding and sealing the display substrate and the encapsulation substrate together, and a filling material for filling the space between the display substrate and the encapsulation substrate. The pixel defining layer is divided into a plurality of deposit regions having a relatively small height and that are uniformly distributed, and a diffusion region surrounding the plurality of deposit regions and having a larger height than that of the plurality of deposit regions.