A liquid crystal display device, without light leakage in a black display mode, is provided. The liquid crystal display (LCD) device includes a LCD panel, a light source, and an optical filter between the LCD and the light source. When the LCD panel is in the black display mode without the optical filter, leakage light leaking from the LCD panel in an oblique direction shows a hue having a local minimum value in a wavelength range from 450 nm to 550 nm. Normal incident light entering into the LCD in a normal direction shows a hue same as that of light just emitted from the light source, and oblique incident light entering into the LCD panel in an oblique direction shows a hue having a local maximum value in a wavelength range from 400 nm to less than 550 nm.