An organic light-emitting display (OLED) device is disclosed. In one aspect, the OLED device includes a substrate including a display region and a peripheral region and a transistor disposed in the display region and including an active pattern, a gate insulation layer, a gate electrode, a source electrode, and a drain electrode. The OLED device also includes an organic light-emitting structure disposed in the display region and electrically connected to the transistor, the organic light-emitting structure including a first electrode, an organic light-emitting layer, and a second electrode, and a first wiring and a second wiring disposed in the peripheral region and configured to generate heat. The OLED device further includes an encapsulation layer disposed over the first and second wirings and the organic light-emitting structure and a heat blocking layer disposed between the first and the second wirings and the encapsulation layer to block the heat generated from the first and the second wirings.