An organic light emitting diode (OLED) display device including an active array structure, a display structure and several conductive members is provided. The active array structure includes a first substrate and several thin film transistors. The thin film transistors disposed on the first substrate has several drains. The display structure includes a second substrate, a color changing medium, a first electrode layer, an organic material layer and a second electrode layer disposed sequentially. The location of the second substrate corresponds to that of the first substrate. The color changing medium has several color blocks. The organic material layer is used for emitting blue light and includes several lighting structures electrically insulated from each other. The second electrode layer includes several electrode structures electrically insulated from each other. Each of the conductive members is combined and electrically connected to the drain of each thin film transistor and each electrode structure.