A display device is disclosed. The display device includes subpixels including data lines, scan lines, and one or more thin film transistors (TFTs). The display device includes a second switching TFT configured to output a reference signal input through a drain node to a source node according to a second scan signal input through a gate node, a first switching TFT configured to have a drain node connected to the source node of the second switching TFT, and form a current path such that the reference signal input through the drain node is transmitted to the data line according to a first scan signal input to a gate node, and an integrated circuit (IC) unit configured to sense a voltage of a current transmitted to the data line through the first switching TFT and sense a threshold voltage of the first switching TFT based on the sensed voltage.