| 主权项 |
1. A liquid crystal display device comprising an optical device, a liquid crystal panel, and a light source arranged on one side of the liquid crystal panel,
wherein the optical deviceis arranged between the liquid crystal panel and the light source, wherein the optical device satisfies the following Formula 4 or Formula 5, and the optical device comprises: a liquid crystal film comprising a substrate and a liquid crystal layer formed on at least one side of the substrate, wherein the side of the substrate on which the liquid crystal layer is formed has a wetting angle of 30° to 50°, wherein the liquid crystal layer is a single layer and comprises at least two types of cholesteric-aligned liquid crystal areas, of which center wavelengths of reflected light are different from each other, and has a haze value of 15% to 30%, wherein the at least two types of cholesteric-aligned liquid crystal areas comprise a first liquid crystal area on which a helical axis of a director of a cholesteric liquid crystal molecule is formed parallel to a thickness direction of the liquid crystal layer, and a second liquid crystal area on which the helical axis of the director of the cholesteric liquid crystal molecules formed is formed not parallel to a thickness direction of the liquid crystal layer, and a λ/4 wavelength layer formed on one side or both sides of the liquid crystal film:
|X1−X2|≦0.1 [Formula 4]|Y1−Y2|≦0.1 [Formula 5] where, X2 and Y2 are an x value and a y value in a tristimulus value of CIE color space of light penetrated through the by irradiating to one side of the optical device, respectively; and X1 and Y1 are an x value and a y value in the tristimulus value of the CIE color space before light irradiated to the optical device penetrates through the optical device. |
