Polarizing plate and optical display apparatus comprising the same
A polarizing plate and an optical display apparatus including the same are provided. A polarizing plate includes: a polarizer; an antireflection film stacked on a first surface of the polarizer; and a retardation film stacked on a second surface of the polarizer, and the antireflection film has a water vapor transmission rate of 1 g/m 2 ·day to 30 g/m 2 ·day, and the retardation film has a water vapor transmission rate of 1 g/m 2 ·day to 100 g/m 2 ·day.
1 . A polarizing plate comprising:
a polarizer;
an antireflection film stacked on a first surface of the polarizer; and
a retardation film stacked on a second surface of the polarizer,
wherein the antireflection film has a water vapor transmission rate of 15 g/m 2 ·day to 30 g/m 2 ·day, and the retardation film has a water vapor transmission rate of 1 g/m 2 ·day to 100 g/m 2 ·day,
wherein the antireflection film has a reflectivity of 0% to 0.5% at a wavelength of 550 nm,
wherein the antireflection film has a minimum reflected wavelength of 480 to 540 nm;
wherein the antireflection film has a degree of biaxiality of 1.5 to 1.8 at a wavelength of 550 nm; and
wherein the retardation film has a degree of biaxiality of 1.0 to 1.3 at a wavelength of 550 nm.
2 . The polarizing plate according to claim 1 , wherein the retardation film exhibits positive wavelength dispersion.
3 . The polarizing plate according to claim 1 , wherein the retardation film has a short wavelength dispersion of 0.99 to 1.05 and a long wavelength dispersion of 0.98 to 1.04.
4 . The polarizing plate according to claim 1 , wherein the retardation film has an in-plane retardation of 130 nm to 160 nm at a wavelength of 550 nm.
5 . The polarizing plate according to claim 1 , wherein the antireflection film has a positive (+) reflected color value a* of 4 to 10 and a negative (−) reflected color value b* of −20 to −1.
6 . The polarizing plate according to claim 1 , wherein the antireflection film has an in-plane retardation (Re) of 3,000 nm or more at a wavelength of 550 nm.
7 . The polarizing plate according to claim 1 , wherein the antireflection film comprises a base layer and a low reflectivity layer stacked on the base layer.
8 . The polarizing plate according to claim 7 , wherein the low reflectivity layer has a thickness of 110 nm to 180 nm.
9 . The polarizing plate according to claim 7 , wherein the base layer comprises at least one selected from among a polyester resin and a cyclic olefin polymer resin.
10 . The polarizing plate according to claim 7 , further comprising at least one selected from among a hard coating layer and a high refractivity layer between the base layer and the low reflectivity layer.
11 . The polarizing plate according to claim 1 , wherein, with reference to a machine direction (MD) of the polarizing plate, the polarizer has an absorption axis tilted at an angle of −1° to +1°, a base layer included in the antireflection film has a slow axis tilted at an angle of +80° to +100°, and the retardation film has a slow axis tilted at an angle of −137° to −133° or at an angle of −47° to −43°.
12 . The polarizing plate according to claim 1 , further comprising:
a first bonding layer between the polarizer and the antireflection film; and
a second bonding layer between the polarizer and the retardation film,
each of the first and second bonding layers being formed of an actinic radiation-curable bonding agent.
13 . An optical display apparatus comprising the polarizing plate according to claim 1 .