Anti-reflective film having monolayer arrangement of inorganic hollow particles, polarizing plate comprising same, and optical display device comprising same
Provided are an anti-reflective film, a polarizing plate comprising same, and an optical display device comprising same, wherein in the anti-reflective film, a base layer, a high-refractive layer, and a low-refractive layer are sequentially stacked, the low-refractive layer comprising inorganic hollow particles having an average particle diameter of about 70 nm to about 150 nm, the low-refractive layer comprising a single layer arrangement of the inorganic hollow particles.
1. An anti-reflective film comprising: a base layer, a high refractivity layer, and a low refractivity layer sequentially stacked,
wherein the low refractivity layer comprises a monolayer arrangement of inorganic hollow particles having an average particle diameter of about 70 nm to about 150 nm and arranged in a single layer within the anti-reflective film, the single layer forming an outermost layer of hollow particles of the anti-reflective film, a difference in index of refraction between the high refractivity layer and the low refractivity layer is about 0.25 or greater, the low refractivity layer has an index of refraction of about 1.35 or less, and the high refractivity layer has an index of refraction of about 1.53 to about 1.70; and
wherein the inorganic hollow particles form an outermost surface of the anti-reflective film.
2. The anti-reflective film according to claim 1 , wherein the single layer has a thickness of about X nm to about X nm+3 nm when the average particle diameter of the inorganic hollow particles is about X nm.
3. The anti-reflective film according to claim 1 , wherein the inorganic hollow particles comprise hollow silica.
4. The anti-reflective film according to claim 1 , wherein the low refractivity layer has a thickness in the range of about 100% to about 120% of the average particle diameter of the inorganic hollow particles.
5. The anti-reflective film according to claim 1 , wherein the inorganic hollow particles are present in an amount of about 20 wt % to about 70 wt % in the low refractivity layer.
6. The anti-reflective film according to claim 1 , wherein the inorganic hollow particles are continuously arranged without a gap therebetween.
7. The anti-reflective film according to claim 1 , wherein the monolayer arrangement of the inorganic hollow particles directly adjoins the high refractivity layer.
8. The anti-reflective film according to claim 1 , further comprising:
a hard coating layer between the base layer and the high refractivity layer.
9. A polarizing plate comprising: a polarizer; and the anti-reflective film according to claim 1 formed on a light exit surface of the polarizer.
10. The anti-reflective film according to claim 1 ,
wherein the anti-reflective film has a reflectivity variation rate of about 100% or less, as calculated by Equation 1:
Reflectivity variation rate=| R 1 −R 0 |/R 0 ×100, <Equation 1>
where, in Equation 1, R 0 indicates initial reflectivity (unit: %) of the anti-reflective film and R 1 indicates reflectivity (unit: %) of the anti-reflective film left at 60° C. and 95% relative humidity (RH) for 72 hours.
11. The anti-reflective film according to claim 10 , wherein R 1 is about 0.7% or less in Equation 1.
12. The polarizing plate according to claim 9 , wherein the polarizing plate has a reflectivity variation rate of about 100% or less, as calculated by Equation 2:
Reflectivity variation rate=| R 3 −R 2 |/R 2 ×100, <Equation 2>
where, in Equation 2, R 2 indicates initial reflectivity (unit: %) of the polarizing plate and R 3 indicates reflectivity (unit: %) of the polarizing plate left at 60° C. and 95% RH for 72 hours.
13. The polarizing plate according to claim 9 , further comprising:
a polarizer protective layer formed on a light incident surface of the polarizer.
14. An optical display device comprising the polarizing plate according to claim 9 .