Method of operating an organic light emitting display device and organic light emitting display device

An organic light emitting display device comprising:

• a display panel comprising a plurality of pixels;
• a scan driver configured to apply a plurality of scan signals, a plurality of initialization control signals and a plurality of bypass signals to the plurality of pixels;
• a data driver configured to apply a plurality of data voltages to the plurality of pixels;
• an emission driver configured to apply a plurality of emission control signals to the plurality of pixels;
• and
• a power supply unit configured to generate an initialization voltage,
• wherein storage capacitors of the plurality of pixels store an initialization voltage in a first period of an initial period, and
• wherein driving transistors of the plurality of pixels are concurrently turned on based on the stored initialization voltage in a second period of the initial period.