Disclosed is a display device including: a timing controller outputting image data and a data driving control signal based on an image signal and a control signal inputted from the outside; a data driver outputting a data voltage corresponding to the image data based on the data driving control signal; and a display panel displaying an image corresponding to the data voltage, and the data driver includes: a buffer array where buffer groups, each of which is composed of one or more adjacent output buffers, are disposed; a bias current controller applying a bias current to the buffer groups; and an output circuit sequentially applying the data voltage outputted from the buffer groups to data lines in response to a source output enable signal and driving method for the same.