POLARIZING PLATE AND OPTICAL DISPLAY APPARATUS
A polarizing plate and an optical display apparatus including the same are disclosed. A polarizing plate includes: a polarizer; and a first protective film stacked on a surface of the polarizer, the first protective film has an overall haze of 40% to 60% and an internal haze of 3% to 7%, and the polarizing plate has a light transmittance ratio of 4 or less, as calculated according to Equation 1, and a light transmittance ratio of 20 or more, as calculated according to Equation 2.
1 . A polarizing plate comprising:
a polarizer; and
a first protective film stacked on a surface of the polarizer,
wherein the first protective film has an overall haze of 40% to 60% and an internal haze of 3% to 7%, and
wherein the polarizing plate has a light transmittance ratio of 4 or less, as calculated according to the following Equation 1, and a light transmittance ratio of 20 or more, as calculated according to the following Equation 2:
Light
transmittance
ratio
=
Tc
(
430
nm
)
/
Tc
(
550
nm
)
,
(
1
)
Light
transmittance
ratio
=
Tc
(
700
nm
)
/
Tc
(
550
nm
)
,
(
2
)
where
Tc (430 nm) denotes a crossed transmittance of the polarizing plate at a wavelength of 430 nm (unit: %),
Tc (550 nm) denotes a crossed transmittance of the polarizing plate at a wavelength of 550 nm (unit: %), and
Tc (700 nm) denotes a crossed transmittance of the polarizing plate at a wavelength of 700 nm (unit: %).
2 . The polarizing plate as claimed in claim 1 , wherein the crossed transmittance of the polarizing plate at a wavelength of 430 nm is 0.009% or less.
3 . The polarizing plate as claimed in claim 1 , wherein the crossed transmittance of the polarizing plate at a wavelength of 550 nm is 0.005% or less.
4 . The polarizing plate as claimed in claim 1 , wherein the crossed transmittance of the polarizing plate at a wavelength of 700 nm is at least 0.035%.
5 . The polarizing plate as claimed in claim 1 , wherein the first protective film has a ratio of external haze to internal haze in a range of 9 to 20.
6 . The polarizing plate as claimed in claim 1 , wherein the first protective film comprises a base layer and an antiglare layer stacked on a surface of the base layer.
7 . The polarizing plate as claimed in claim 6 , further comprising an antireflection layer stacked on a surface of the antiglare layer.
8 . The polarizing plate as claimed in claim 1 , wherein the polarizing plate has a ratio of 0.25 or less, as calculated according to the following Equation 3:
Ratio
=
Tc
(
700
nm
)
/
(
Haze
×
0.01
)
,
(
3
)
where Haze denotes overall haze of the first protective film (unit: %), and
Tc (700 nm) denotes the crossed transmittance of the polarizing plate at a wavelength of 700 nm (unit: %).
9 . The polarizing plate as claimed in claim 1 , further comprising a second protective film stacked on another surface of the polarizer.
10 . The polarizing plate as claimed in claim 9 , wherein the second protective film is a retardation film.
11 . An optical display apparatus comprising the polarizing plate as claimed in claim 1 .