A liquid crystal display device comprising: a display panel on which pixels to which an input image is applied are arranged; a backlight unit irradiating light onto the display panel; a light valve panel, disposed between the display panel and the backlight unit, wherein the light valve panel is configured to adjust an amount of light to be irradiated from the backlight unit onto the display panel, a first panel circuitry (10, 20, 30) and second panel circuitry (11, 50), and backlight driving circuitry; wherein the light valve panel is configured to adjust an amount of light transmitted by the light valve panel and comprises: a liquid crystal layer; a light valve data line (LVDL); a first electrode directly connected to the light valve data line (LVDL); and a second electrode facing the first electrode with the liquid crystal layer interposed therebetween, - wherein the second panel circuitry (11, 50) is configured to supply a light valve data voltage (LVData) depending on the input image to the light valve data line (LVDL), wherein the first electrode and the second electrode are configured to receive voltages for changing a transmittance of the liquid crystal layer, wherein the second panel circuitry (11, 50) is further configured to supply a common voltage (Vcom) to the second electrode, wherein the common voltage (Vcom) is swinging in the same phase in synchronization with the light valve data voltage (LVData). a display panel on which pixels to which an input image is applied are arranged; a backlight unit irradiating light onto the display panel; a light valve panel, disposed between the display panel and the backlight unit, wherein the light valve panel is configured to adjust an amount of light to be irradiated from the backlight unit onto the display panel, a first panel circuitry (10, 20, 30) and second panel circuitry (11, 50), and backlight driving circuitry; wherein the light valve panel is configured to adjust an amount of light transmitted by the light valve panel and comprises: a liquid crystal layer; a light valve data line (LVDL); a first electrode directly connected to the light valve data line (LVDL); and a second electrode facing the first electrode with the liquid crystal layer interposed therebetween, - wherein the second panel circuitry (11, 50) is configured to supply a light valve data voltage (LVData) depending on the input image to the light valve data line (LVDL), wherein the first electrode and the second electrode are configured to receive voltages for changing a transmittance of the liquid crystal layer, wherein the second panel circuitry (11, 50) is further configured to supply a common voltage (Vcom) to the second electrode, wherein the common voltage (Vcom) is swinging in the same phase in synchronization with the light valve data voltage (LVData). a liquid crystal layer; a light valve data line (LVDL); a first electrode directly connected to the light valve data line (LVDL); and a second electrode facing the first electrode with the liquid crystal layer interposed therebetween, - wherein the second panel circuitry (11, 50) is configured to supply a light valve data voltage (LVData) depending on the input image to the light valve data line (LVDL), - wherein the second panel circuitry (11, 50) is configured to supply a light valve data voltage (LVData) depending on the input image to the light valve data line (LVDL), wherein the first electrode and the second electrode are configured to receive voltages for changing a transmittance of the liquid crystal layer, wherein the second panel circuitry (11, 50) is further configured to supply a common voltage (Vcom) to the second electrode, wherein the common voltage (Vcom) is swinging in the same phase in synchronization with the light valve data voltage (LVData).