A display apparatus includes a display panel including data lines, first to nth data driver integrated circuits (ICs) (n being a natural number greater than 1) supplying data voltages to the data lines, a controller controlling the first to nth data driver ICs, and a power supply supplying power to the first to nth data driver ICs, the first data driver IC includes a lock signal switching unit receiving or blocking a lock signal from the power supply, a pull-up resistor is provided between the second data driver IC and a lock signal line to which the lock signal is supplied from the power supply, and the lock signal supplied to the first data driver IC or the second data driver IC is transferred to the controller through the first to nth data driver ICs.