An organic light-emitting diode (OLED) display is disclosed. In one aspect, the OLED display includes a scan line configured to transmit a scan signal and a data line crossing the scan line and configured to transmit a data voltage. The OLED display also includes a driving voltage line crossing a scan line and configured to transmit a driving voltage, a switching transistor connected to the scan and data lines, and a driving transistor connected to the switching transistor and including a driving gate electrode configured to function as a first storage electrode. The OLED display further includes a second storage electrode overlapping the first storage electrode and an expansion portion of the driving voltage line, an OLED electrically connected to the driving transistor and a blocking layer extending from the driving drain electrode and overlapping a portion of the data.