Organic light emitting display device

An organic light emitting display device, comprising:

• a display panel including a plurality of pixels;
• a power supply circuit configured to output a first power source to the display panel, the power supply circuit being disposed on a first board;
• a voltage detection unit disposed between the display panel and the power supply circuit, the voltage detection unit detecting a detection voltage data of the first power source output from the power supply circuit;
• a voltage compensation circuit configured to compare the detection voltage data with a previously stored reference voltage data, and control the power supply circuit to output the first power source having a voltage level set based on the reference voltage data;
• and
• a second board disposed between the display panel and the first board, the second board including the voltage detection unit and the voltage compensation circuit,
• wherein the voltage compensation circuit includes an electrically erasable programmable read-only memory (EEPROM) configured to store the reference voltage data therein, a micro controller unit (MCU) configured to compare the detection voltage data with the reference voltage data and calculate a compensation value set based on a result of comparing the detection voltage data with the reference voltage data, and a digital-analog converter (DAC) configured to convert the compensation value into an analog signal.