Polarizing Plate and Uses Thereof
The present application relates to a polarizing plate and a use thereof. The present application provides a polarizing plate capable of improving the problem of occurrence of rainbow stains in the appearance of an OLED display device, and exhibiting excellent visual appreciation, excellent hardness, and excellent heat-resistance and moisture-and-heat-resistance durability, and an OLED display device comprising the polarizing plate.
1 . A polarizing plate comprising a polarizer and a scattering pressure-sensitive adhesive layer present on one side of the polarizer, wherein the scattering pressure-sensitive adhesive layer has a storage elastic modulus of 120,000 Pa or more at a temperature of 25° C. and a frequency of 1 rad/sec, and the polarizing plate has a haze of 12% or more.
2 . The polarizing plate according to claim 1 , wherein the scattering pressure-sensitive adhesive layer comprises a pressure-sensitive adhesive resin and beads.
3 . The polarizing plate according to claim 2 , wherein the scattering pressure-sensitive adhesive layer comprises a pressure-sensitive adhesive resin, and the pressure-sensitive adhesive resin has an IPN (interpenetrating network) cross-linked structure.
4 . The polarizing plate according to claim 3 , wherein the IPN cross-linked structure comprises a first cross-linked structure formed by a cross-linking reaction of a cross-linkable polymer and a polyfunctional cross-linking agent and a second cross-linked structure formed by a polymerization reaction of a radically polymerizable compound.
5 . The polarizing plate according to claim 4 , wherein the difference (A-B) between the refractive index (A) of the cross-linkable polymer and the refractive index (B) of the beads is in a range of 0.05 to 0.1.
6 . The polarizing plate according to claim 2 , wherein the beads comprise a silicone resin.
7 . The polarizing plate according to claim 2 , wherein the beads are included in a range of 2 parts by weight to 10 parts by weight relative to 100 parts by weight of the pressure-sensitive adhesive resin.
8 . The polarizing plate according to claim 1 , wherein the scattering pressure-sensitive adhesive layer has a thickness in a range of 15 μm to 25 μm.
9 . The polarizing plate according to claim 1 , wherein the scattering pressure-sensitive adhesive layer has a glass pushing distance measured at 800 gf for 1000 seconds in a range of 150 μm to 210 μm.
10 . The polarizing plate according to claim 1 , wherein the polarizing plate has a haze change rate ΔHa of Equation 1 after resisting heat and a haze change rate ΔHb of Equation 2 after resisting moisture and heat of 2% or less, respectively:
Δ
Ha
=
(
H
1
-
H
2
)
/
H
1
×
100
%
[
Equation
1
]
Δ
Hb
=
(
H
3
-
H
4
)
/
H
3
×
100
%
[
Equation
2
]
wherein, in Equation 1, H 1 is the haze of the polarizing plate at a temperature of 25° C., and H 2 is the haze of the polarizing plate after storage at a temperature of 80° C. for 500 hours; and in Equation 2, H 3 is the haze of the polarizing plate at a temperature of 25° C., and H 4 is the haze of the polarizing plate after storage at a temperature of 60° C. and 90% relative humidity for 500 hours.
11 . The polarizing plate according to claim 1 , further comprising a polarizer protective film present on one or both sides of the polarizer.
12 . The polarizing plate according to claim 1 , further comprising a retardation layer between the polarizer and the scattering pressure-sensitive adhesive layer.
13 . An OLED (organic light emitting diode) display device comprising an OLED display panel and the polarizing plate of claim 1 disposed on one side of the OLED display panel.
14 . The OLED display device according to claim 13 , wherein the polarizing plate is disposed on the light emission side of the OLED display panel.