A transreflective liquid crystal display device comprising: an upper substrate on which color filters are disposed; a lower substrate parallel to the upper substrate on which scanning lines and data lines are formed; a liquid crystal layer sandwiched between the upper substrate and the lower substrate, wherein liquid crystal molecules of the liquid crystal layer are arranged parallel to the upper substrate when no voltage is applied; and a backlight unit provided on a surface of the lower substrate opposite to the liquid crystal layer, wherein a transparent electrode is disposed on a surface of the upper substrate facing the liquid crystal layer, comb-shaped electrodes are disposed on a surface of the lower substrate facing the liquid crystal layer, and the comb-shaped electrodes include a first comb-shaped electrode and a second comb-shaped electrode which are interdigitated; characterized in that the transreflective liquid crystal display device is adapted to perform a transmission display mode by applying a voltage to the first comb-shaped electrode and the second comb-shaped electrode and floating the transparent electrode to generate an electrical field parallel to the upper substrate in the liquid crystal layer; and wherein the transreflective liquid crystal display device is adapted to perform a reflective display mode by applying a voltage to one of the comb-shaped electrodes and the transparent electrode and floating the other of the comb-shaped electrodes to generate an electrical field perpendicular to the upper substrate in the liquid crystal layer; wherein both the transmission display mode and the reflective display mode are normally white display mode. an upper substrate on which color filters are disposed; a lower substrate parallel to the upper substrate on which scanning lines and data lines are formed; a liquid crystal layer sandwiched between the upper substrate and the lower substrate, wherein liquid crystal molecules of the liquid crystal layer are arranged parallel to the upper substrate when no voltage is applied; and a backlight unit provided on a surface of the lower substrate opposite to the liquid crystal layer, wherein a transparent electrode is disposed on a surface of the upper substrate facing the liquid crystal layer, comb-shaped electrodes are disposed on a surface of the lower substrate facing the liquid crystal layer, and the comb-shaped electrodes include a first comb-shaped electrode and a second comb-shaped electrode which are interdigitated; characterized in that the transreflective liquid crystal display device is adapted to perform a transmission display mode by applying a voltage to the first comb-shaped electrode and the second comb-shaped electrode and floating the transparent electrode to generate an electrical field parallel to the upper substrate in the liquid crystal layer; and wherein the transreflective liquid crystal display device is adapted to perform a reflective display mode by applying a voltage to one of the comb-shaped electrodes and the transparent electrode and floating the other of the comb-shaped electrodes to generate an electrical field perpendicular to the upper substrate in the liquid crystal layer; wherein both the transmission display mode and the reflective display mode are normally white display mode.