Anti-reflective film

1. An anti-reflective film comprising: a hard coating layer; and a low refractive index layer including a binder resin, and hollow inorganic nanoparticles and solid inorganic nanoparticles which are dispersed in the binder resin,

wherein the low refractive index layer includes the hollow inorganic nanoparticles in a higher amount by weight than the solid inorganic nanoparticles,

wherein a ratio of an average particle diameter of the solid inorganic nanoparticles to an average particle diameter of the hollow inorganic nanoparticles is 0.26 to 0.55,

the average particle diameter of the hollow inorganic nanoparticles is in a range of 40 nm to 100 nm,

wherein the low refractive index layer comprises a first layer containing at least 70% by volume of the total volume of solid inorganic nanoparticles and a second layer containing at least 70% by volume of the total volume of hollow inorganic nanoparticles,

wherein the first layer is positioned to be closer to an interface between the hard coating layer and the low refractive index layer, compared to the second layer,

wherein the first layer has a refractive index of 1.420 to 1.600, and

wherein the anti-reflective film exhibits average reflectance of 0.7% or less in the visible light wavelength region of 380 nm to 780 nm.

2. The anti-reflective film of claim 1 , wherein the hollow inorganic nanoparticles have particle diameters in a range of 10 nm to 200 nm.

3. The anti-reflective film of claim 1 , wherein the solid inorganic nanoparticles have particle diameters in a range of 0.1 nm to 100 nm and the average particle diameter of the solid inorganic nanoparticles is in a range of 14.5 nm to 30 nm.

4. The anti-reflective film of claim 1 , wherein

each of the solid inorganic nanoparticles and the hollow inorganic nanoparticles contains one or more reactive functional groups selected from the group consisting of a hydroxyl group, a (meth)acrylate group, an epoxide group, a vinyl group, and a thiol group on the surface thereof.

5. The anti-reflective film of claim 1 , wherein

the binder resin contained in the low refractive index layer includes a crosslinked (co)polymer between a first compound of a (co)polymer of a photopolymerizable compound and a second compound of a fluorine-containing compound containing a photoreactive functional group, the first compound and the second compound are different from each other.

6. The anti-reflective film of claim 5 , wherein

the low refractive index layer includes 10 to 400 parts by weight of the hollow inorganic nanoparticles and 10 to 400 parts by weight of the solid inorganic nanoparticles, relative to 100 parts by weight of the (co)polymer of the photopolymerizable compound.

7. The anti-reflective film of claim 1 , wherein

the low refractive index layer further includes a silane-based compound containing at least one reactive functional group selected from the group consisting of a vinyl group and a (meth)acrylate group.

8. The anti-reflective film of claim 7 , wherein

the silane-based compound containing at least one reactive functional group selected from the group consisting of the vinyl group and the (meth)acrylate group contains the reactive functional group with an equivalent weight of 100 to 1000 g/mol.

9. The anti-reflective film of claim 7 , wherein

the silane-based compound containing at least one reactive functional group selected from the group consisting of the vinyl group and the (meth) acrylate group has a weight average molecular weight of 100 to 5000.

10. The anti-reflective film of claim 1 , wherein

the hard coating layer includes a binder resin containing a photocurable resin and organic or inorganic fine particles dispersed in the binder resin.

11. The anti-reflective film of claim 10 , wherein

the organic fine particles have a particle diameter of 1 to 10 μm, and

the inorganic fine particles have a particle diameter of 1 nm to 500 nm.

12. The anti-reflective film of claim 1 , wherein the solid inorganic nanoparticles have a density higher by 0.50 g/cm 3 or more compared to the hollow inorganic nanoparticles.

13. The anti-reflective film of claim 12 , wherein the hollow inorganic nanoparticles are hollow silica nanoparticles and the solid inorganic nanoparticles are solid silica nanoparticles.

14. The anti-reflective film of claim 1 , wherein the hollow inorganic nanoparticles are hollow silica nanoparticles and the solid inorganic nanoparticles are solid silica nanoparticles.

15. The anti-reflective film of claim 1 , wherein the ratio of an average particle diameter of the solid inorganic nanoparticles to an average particle diameter of the hollow inorganic nanoparticles is 0.26 to 0.35.