A liquid crystal display device and a driving method thereof for preventing a color distortion phenomenon in a field-sequential driving system are disclosed. In the liquid crystal display device, a data driver sequentially supplies a green data signal, a red data signal and a blue data signal to the data lines. A gate driver applies a scanning pulse to gate lines. A light source irradiates a green light onto a liquid crystal cell during a time interval when the green data signal is maintained at the liquid crystal cell, irradiates a red light onto the liquid crystal cell during a time interval when the red data signal is maintained at the liquid crystal cell, and irradiates a blue light to the liquid crystal cell during a time interval when the blue data signal is maintained at the liquid crystal cell.