Organic light emittng display device and driving method thereof

The invention shown including a plurality of scan lines, a plurality of data lines, and a plurality of pixels connected to the scan lines and the data line panel; A power supply for supplying the first pixel voltage and the second pixel voltage to the pixel; And a display driver for controlling the display panel, the display panel, the first frame while under the control of the display driving unit, a first drive mode while the first display an image with a frame frequency, and a second drive mode, the organic light emitting display to display images at a lower frequency than the second frame frequency, and relates to a driving method.