the blue light having a wavelength of 460 nm generated from the backlight unit 11 thereby emitting light having a wavelength of approximately 460 nm the backlight unit 11 and a first polarizer 12 are sequentially disposed on the rear plate 20 referring to fig8 the backlight unit 11 includes a light guide diffusion member 11 a and blue lamps 11 b the blue lamps 11 b may be blue leds as described above the light guide diffusion member 11 a guides and uniformly diffuses the blue light emitted from the blue lamps 11 b onto the rear plate 20 the light guide diffusion member 11 a is optionally installed and the blue lamps 11 b may be arranged on the entire surface of the rear plate 20 when the blue lamps 11 b are leds the plurality of led lamps may be arranged parallel to each other in an edge of the light guide diffusion member 11 a that is an edge lighting manner as shown in fig8 according to another embodiment of the present invention shown in fig9 a plurality of leds may be arranged on the entire surface of the light guide diffusion member 11 a in the rear plate 20 fig1 is a cross sectional view illustrating.