Patent ID: 11880017
Assignee: LG CHEM, LTD.
Field: Optics (Instruments)
Classification: CPC G  B  C | IPC G

Claim 0:
1. An anti-reflective film with a mean reflectance of 0.6% or less in the visible light wavelength region of 380 nm to 780 nm comprising:
a light transmitting substrate;
a hard coating layer formed on the light transmitting substrate; and
a low refractive index layer formed on the hard coating layer,
wherein the low refractive index layer comprises a first region comprising a binder resin and high refractive index inorganic nanoparticles, and a second region comprising the binder resin and low refractive index inorganic nanoparticles,
wherein the low refractive index inorganic nanoparticles comprise low refractive index inorganic nanoparticles that are hollow, mesoporous, or a combination thereof, and a ratio of an average particle diameter of the high refractive index inorganic nanoparticles to an average particle diameter of the low refractive index inorganic nanoparticles is 0.008 to 0.55,
wherein the first region of the low refractive index layer is positioned in contact with an interface between the hard coating layer and the low refractive index layer, and the second region of the low refractive index layer is positioned on the opposite side of the first region relative to the interface,
wherein the first region and the second region have an interface comprising the high refractive index inorganic nanoparticles and the low refractive index inorganic nanoparticles,
wherein each of the first region and the second region of the low refractive index layer has polarization ellipticity measured by ellipsometry using a Cauchy model represented by Equation 1 below, in which a difference between an A value of the first region and an A value of the second region is at least 0.200, the A value of the second region is 1.0 to 1.40, each of B values of the first and second regions is 0 to 0.1, and each of C values of the first and second regions is 0 to 0.01,
wherein the first and second regions are optical regions that are distinguished from each other as determined by the polarization ellipticity measured by ellipsometry using the Cauchy model represented by Equation 1, and
wherein the second region of the low refractive layer has a refractive index of 1.45 or less at 550 nm, and the first region of the low refractive layer has a refractive index of at least 1.55 at 550 nm:, n
          ⁡
          
            (
            λ
            )
          
        
        =
        
          A
          +
          
            B
            
              λ
              2
            
          
          +
          
            C
            
              λ
              4
            
          
        
      
    
    
      
        [
        
          Equation
          ⁢
          
            
          
          ⁢
          1
        
        ]
      
    
  

wherein, in the Equation 1, n(λ) is a refractive index at a λ, wavelength, λ, is in a range of 300 nm to 1800 nm, and A, B, and C are Cauchy parameters.