An organic light-emitting diode (OLED) display is disclosed. In one aspect, the OLED display includes a substrate, an interlayer insulating layer arranged over the substrate and an OLED arranged over the interlayer insulating layer. The OLED display also includes a source electrode and a drain electrode arranged over the interlayer insulating layer and a via layer arranged over the interlayer insulating layer and having a via hole exposing the source electrode or the drain electrode. The interlayer insulating layer includes a projecting portion which projects toward the OLED in the via hole.