Display substrate and method of manufacturing the same

A method of manufacturing a display substrate, the method comprising:

• forming a TFT on a substrate, the substrate comprising an active area and an inactive area, the forming of the TFT being on the active area of the substrate;
• forming an OLED electrically connected to the TFT and comprising a first electrode, an organic light-emitting layer and a second electrode;
• concurrently or simultaneously forming a deposition assistant layer on a first region of the second electrode with a deposition assistant layer pattern on the inactive area of the substrate;
• concurrently or simultaneously forming a conductive layer electrically connected to the second electrode, the forming of the conductive layer comprising depositing a conductive material on a second region of the second electrode, which excludes the first region, with a transmittance measurement pattern unit, the depositing of the transmittance measurement pattern unit comprising depositing the conductive material on the deposition assistant layer pattern;
• and
• measuring transmittance of the transmittance measurement pattern unit to determine whether a defect is present.