Patent ID: 9632229
Date: 2017-04-25
CPC Classifications: G02B,G02F

Claim:
1. A liquid crystal display device, comprising: a backlight unit including a light conversion member; and a liquid crystal cell, wherein the light conversion member includes a light conversion layer containing a fluorescent material and an optical film arranged on both surfaces of the light conversion layer containing the fluorescent material, the optical film includes an optical thin film forming an air interface, and a layer directly adjacent to the optical thin film, the optical film satisfies the following Expression (1), the optical film satisfies any one of the following Expressions (2-1), (2-2), and (2-3), all transmittances of the optical film at a Y value in an XYZ color system at a wavelength of 430 nm to 470 nm, a wavelength of 515 nm to 555 nm, and a wavelength of 600 nm to 650 nm are greater than transmittance of the optical film at a Y value in an XYZ color system at a wavelength of greater than 470 nm and less than 515 nm and a wavelength of greater than 555 nm and less than 600 nm, the backlight unit emits blue light which has an emission peak wavelength in a wavelength range of 430 nm to 480 nm and has a full width at half maximum of less than or equal to 100 nm, green light which has an emission peak wavelength in a wavelength range of 500 nm to 600 nm and has a full width at half maximum of less than or equal to 100 nm, and red light which has an emission peak wavelength in a wavelength range of 600 nm to 650 nm and has a full width at half maximum of less than or equal to 100 nm, in Expression (1), n(535) represents a refractive index of the optical thin film at a wavelength of 535 nm, and nu(535) represents a refractive index of the layer directly adjacent to the optical thin film at a wavelength of 535 nm, in Expressions (2-1), (2-2), and (2-3), n(535) represents a refractive index of the optical thin film at a wavelength of 535 nm, d represents a thickness of the optical thin film, and the unit is μm.