A display device including a flexible substrate that includes a display part to display an image; a driving integrated chip (IC) that supplies a driving voltage to the display part; a flexible printed circuit (FPC) attached to an outer side portion of the substrate; and a printed circuit board (PCB) attached to the FPC, the PCB transferring the driving voltage to the driving IC through the FPC, wherein the FPC includes attachment parts at ends thereof, the attachment parts of the FPC being attached to pad parts at the outer side portion of the substrate and to pad parts of the PCB, and the attachment parts include slits therein.