Display device capable of changing frame frequency and driving method thereof

A display device comprising:

• a display panel including a plurality of pixels which are respectively connected to a plurality of gate lines and a plurality of data lines;
• a gate driving circuit which drives the plurality of gate lines;
• a data driving circuit which drives the plurality of data lines based on an image data signal and a driving reference voltage;
• and
• a driving controller which controls the gate driving circuit in response to an image signal and a control signal received from an outside and provides the image data signal and the driving reference voltage to the data driving circuit,
• wherein the driving controller generates a data enable signal having a display section and a blank section in one frame based on the control signal, and when a difference between a time length of the blank section of a current frame and a time length of the blank section of a previous frame is greater than a reference value, changes the driving reference voltage provided to the data driving circuit to a voltage level corresponding to a current frame frequency.