Display device having multiple driving frequency modes

A driving controller divides a display panel into first and second display areas according to an operation mode, outputs a start signal indicating a start of one frame and a masking signal for indicating a start of the second display area, sets a basic driving frequency to a normal frequency when the operation mode is a normal frequency mode, sets the basic driving frequency to a frequency lower than the normal frequency when the operation mode is a multi-frequency mode, and outputs the start signal and the masking signal. The first display area operates at a first driving frequency and the second display area operates at a second driving frequency, and the scan driving circuit sequentially drives scan lines in synchronization with the start signal, and stops, in response to the masking signal, driving of some of the scan lines corresponding to the second display area.