A display device includes a pixel circuit on a substrate, a data line on the substrate, the data line being configured to transmit a data signal for the pixel circuit, a monitoring line on the substrate, the monitoring line being different from the data line, and a monitoring circuit. The monitoring circuit is configured to monitor a signal at a monitoring point on a path of the data signal with the monitoring line, and supply a correction signal in place of the data signal to the pixel circuit via the monitoring line and the monitoring point in response to detection of transmission failure of the data signal.