A display device and a demultiplexer. A display device includes plural pixels for displaying an image corresponding to first data currents, each pixel including plural sub-pixels. The display device also includes plural scan lines for applying scan signals to the pixels; plural first data lines for applying the first data currents to the pixels; a scan driver for outputting the scan signals to the scan lines; a demultiplexer including plural demultiplexing circuits; and a data driver for transmitting second data currents to plural second data lines. The demultiplexing circuits demultiplex second data currents into first data currents, and transmit the first data currents to the first data lines. A pre-charge voltage is applied to the first data lines before the first data currents are transmitted. This way, the data driver is simplified, and the first data lines are pre-charged with a suitable voltage before programming data, thereby reducing programming time.