A display device includes: a display unit; scanning lines connected to rows of the pixels; data lines connected to columns of the pixels; a dummy scanning line being extended in parallel with the scanning lines; a scanning driver which outputs a selection signal to a selected scanning line and to the dummy scanning line in response to a selection clock signal; a data driver which outputs data for displaying one scanning line in response to a timing determination signal; and a timing determination signal line connected to a node preset on the dummy scanning line and transmits the selection signal transmitted to the node to the data driver as the timing determination signal. Even for a large size display, displaying defects can be prevented.