POLARIZING PLATE AND OPTICAL DISPLAY DEVICE
Provided are a polarizing plate and an optical display device including the polarizing plate, the polarizing plate comprising a polarizer, and a first optical functional layer and a second optical functional layer sequentially stacked on one surface of the polarizer, wherein the first optical functional layer includes anisotropic particles, the anisotropic particles include needle-shaped particles, the needle-shaped particles are oriented in the in-plane direction of the first optical functional layer, the average value of the orientation angles formed by the light absorption axis of the polarizer and the longitudinal direction of the needle-shaped particles is −10° to +10° when the light absorption axis of the polarizer is 0°, the standard deviation of the orientation angles is 15° or lower, and the second optical functional layer includes a cured product of a composition containing an active energy ray-curable resin.
1 . A polarizing plate comprising: a polarizer; and a first optically functional layer and a second optically functional layer sequentially stacked in the stated order on one surface of the polarizer,
wherein the first optically functional layer comprises anisotropic particles comprising acicular particles, the acicular particles being aligned in an in-plane direction of the first optically functional layer;
assuming that a light absorption axis of the polarizer is 0°, orientation angles of the acicular particles defined between longitudinal directions of the acicular particles and the light absorption axis of the polarizer have an average value of −10° to +10° and a standard deviation of 15° or less; and
the second optically functional layer comprises a cured product of a composition comprising an actinic radiation curable resin.
2 . The polarizing plate according to claim 1 , wherein the first optically functional layer is a contrast ratio or brightness-enhancing layer.
3 . The polarizing plate according to claim 1 , wherein each of upper and lower surfaces of the second optically functional layer is a flat surface.
4 . The polarizing plate according to claim 1 , wherein the acicular particles are acicular microparticles.
5 . The polarizing plate according to claim 1 , wherein the acicular particles are formed of at least one selected from among titanium oxide, zirconium oxide, zinc oxide, calcium carbonate, Boehmite, aluminum borate, calcium silicate, magnesium sulfate, magnesium sulfate hydrate, and potassium titanate.
6 . The polarizing plate according to claim 1 , wherein the acicular particles have an average aspect ratio of 5 to 60.
7 . The polarizing plate according to claim 1 , wherein the acicular particles are present in an amount of 1 wt % to 30 wt % in the first optically functional layer.
8 . The polarizing plate according to claim 1 , wherein the first optically functional layer comprises a matrix impregnated with the acicular particles.
9 . The polarizing plate according to claim 8 , wherein the matrix is an adhesive or non-adhesive matrix.
10 . The polarizing plate according to claim 8 , wherein the matrix has a glass transition temperature of −10° C. or less and a storage modulus of 1×10 −3 MPa to 9×10 −1 MPa at 25° C.
11 . The polarizing plate according to claim 1 , wherein the actinic radiation curable resin comprises a vinyl group or (meth)acrylate group-containing resin.
12 . The polarizing plate according to claim 1 , wherein a difference in index of refraction between the matrix in the first optically functional layer and the second optically functional layer (index of refraction of the matrix in the first optically functional layer-index of refraction of the second optically functional layer) is 0.1 or less.
13 . The polarizing plate according to claim 1 , wherein the second optically functional layer has a smaller thickness than the first optically functional layer.
14 . The polarizing plate according to claim 1 , wherein the polarizing plate comprises at least one selected from among a protective layer, an adhesive layer, a bonding layer, a functional layer, and a functional coating layer.
15 . The polarizing plate according to claim 14 , wherein each of the functional film and the functional coating layer is an anti-glare layer, an anti-reflection layer, an ultra-low reflectivity layer, a low refractivity layer, a high refractivity layer, or an anti-fingerprint layer.
16 . An optical display apparatus comprising the polarizing plate according to claim 1 .