Organic light emitting display device and method of operating the same

A method of operating an organic light emitting display device in which an organic light emitting diode included in a pixel circuit emits light in response to an emission on-off clock, the method comprising:

• changing a frame rate of an image frame composing image data while a displaying operation is performed;
• and changing a frame rate of a panel driving frame for the displaying operation as the frame rate of the image frame is changed such that a driving timing of the panel driving frame is synchronized with a transmission timing of the image frame, wherein the frame rate of the image frame is changed using [Equation 1] as follows:
• F
• =
• 1
• A
• ×
• K
• where F denotes the frame rate of the image frame, A denotes one clock cycle time of the emission on-off clock, and K is an integer greater than or equal to 1.