A display device, comprising: a substrate including a display area which has an irregularly shaped side that forms a concave toward an inward direction of the display area, wherein the display area comprises a first display area not including the irregularly shaped side, and a second display area including the irregularly shaped side; and a non-display area which includes a notch area defined by a shape of the irregularly shaped side of the display area and encloses the display area; the second display area is divided into a left second display area and a right second display area by the notch area; a plurality of gate lines in the first display area; a plurality of gate lines in the second display area, which are divided to be disposed in the left display area of the second display area and the right display area of the second display area, wherein a length of the gate lines in the first display area and a length of the gate lines in the second display area are different from each other; a plurality of data lines in the display area; and a plurality of sensing lines disposed in the notch area, wherein gate lines in the second display area are connected to respective sensing lines of the plurality of sensing lines, characterized by a load detecting unit configured to determine via the sensing lines a rising time and falling time of the scan output signals applied to the gate lines disposed in the second display area and to determine a scan load amount difference as the difference between the rising and falling time; and a data driver adapted to determine an offset of a data signal to be applied to the data lines based on the result of a comparison between the scan load amount difference determined by the load detecting unit and a predetermined value and to output data signals to the data line offset by the determined offset. a display area which has an irregularly shaped side that forms a concave toward an inward direction of the display area, wherein the display area comprises a first display area not including the irregularly shaped side, and a second display area including the irregularly shaped side; and a non-display area which includes a notch area defined by a shape of the irregularly shaped side of the display area and encloses the display area; the second display area is divided into a left second display area and a right second display area by the notch area; a plurality of gate lines in the first display area; a plurality of gate lines in the second display area, which are divided to be disposed in the left display area of the second display area and the right display area of the second display area, wherein a length of the gate lines in the first display area and a length of the gate lines in the second display area are different from each other; a plurality of data lines in the display area; and a plurality of sensing lines disposed in the notch area, wherein gate lines in the second display area are connected to respective sensing lines of the plurality of sensing lines, characterized by a load detecting unit configured to determine via the sensing lines a rising time and falling time of the scan output signals applied to the gate lines disposed in the second display area and to determine a scan load amount difference as the difference between the rising and falling time; and a data driver adapted to determine an offset of a data signal to be applied to the data lines based on the result of a comparison between the scan load amount difference determined by the load detecting unit and a predetermined value and to output data signals to the data line offset by the determined offset.