An organic light emitting diode (OLED) display device for monitoring a driving voltage supplied to an OLED display panel from a set unit and generating a compensation voltage and transmitting the compensation voltage to a display panel when voltage drop occurs is discussed. The OLED display device includes a power supply unit of a set unit configured to supply a voltage for driving an OLED of a panel unit, a cable configured to transmit the voltage supplied from the power supply unit of the set unit to the panel unit, and a control circuit unit comprising a voltage adjustment module configured to compare the voltage transmitted through the cable with a target voltage and to generate a voltage with an amplitude corresponding to a difference.