Optical film and display panel
An optical film having an optically-transparent substrate, and a low refractive index layer having a thickness d on one side of the optically-transparent substrate, a polarizing plate and a display panel provided with the same, and a display provided with the same.
1. An optical film comprising an optically-transparent substrate, and a low refractive index layer having a thickness d on one side of the optically-transparent substrate,
wherein the low refractive index layer comprises hollow particles having a refractive index from 1.20 to 1.40 and having an average primary particle diameter of 10 to 100 nm, and solid particles having a refractive index from 1.42 to 1.46 and having a dispersion average particle diameter of a value which is in the range from 1 to 20 nm and a half or less of the thickness d,
wherein a ratio of the average primary particle diameter of the hollow particles and the dispersion average particle diameter of the solid particles (average primary particle diameter/dispersion average particle diameter) is 2.0 or more; and
in an area of a cross-sectional surface of the low refractive index layer in a thickness direction with a width of 500 nm in a plane direction of the low refractive index layer, at least one of the hollow particles is covered with a cured resin of the low refractive index layer and allowed to contact with an interface on a side opposite to an optically-transparent substrate side of the low refractive index layer, and
the solid particles occupy 50% or more of the interface excluding a part in which the hollow particles are in contact with and are eccentrically located from the interlace to the depth which is twice the dispersion average particle diameter of the solid particles in the thickness direction, and
a maximum height (Ry) defined by JIS B 0601-1998 of the interface is 0.050 μm or less.
2. The optical film according to claim 1 , wherein a ratio of the eccentrically located solid particles is from 40 to 100% with respect to the total amount of the solid particles present in the area.
3. A polarizer comprising the optical film defined by claim 1 .
4. A display comprising a back-side member and the polarizer defined by claim 3 arranged on a viewer side of the back-side member.
5. A display comprising a back-side member and the optical film defined by claim 1 arranged on a viewer side of the back-side member.