An organic light emitting diode (OLED) display device and a method of fabricating the same are provided. An embodiment of the OLED display device comprises: a substrate; a secondary battery comprising a first electrode layer, a second electrode layer and an electrolyte layer interposed between the first and second electrode layers; a display panel comprising an array of organic light emitting diodes formed over the substrate, wherein the battery is interposed between the substrate and the display panel; and a power supply voltage line formed over the substrate and outside the display panel, wherein the power supply voltage line electrically interconnects the secondary battery and the display panel.