A display device including pixels; a data driver configured to apply a data signal to data lines connected to the pixels; and a signal controller configured to receive an image signal, a data enable signal, and a main clock signal, and to transmit an image data signal and an output signal that instructs transmitting of the data signal to the data driver. The signal controller is configured to detect electrostatic discharge (ESD) noise using the main clock signal and to mask the output signal when the image signal is distorted as a result of the ESD noise.