Polarizing plate and optical display including the same
A polarizing plate and an optical display including the same are provided. The polarizing plate is composed of a display region and a non-display region surrounding the display region, and includes: a polarizer; and a bonding layer and a first polarizer protective film sequentially stacked on an upper surface of the polarizer. A light shielding layer includes a UV absorbent material and is embedded in the bonding layer to constitute at least a portion of the non-display region. The light shielding layer is formed on at least one surface of the first polarizer protective film.
1. A polarizing plate composed of a display region and a non-display region surrounding the display region, the polarizing plate comprising:
a polarizer;
a bonding layer and a first polarizer protective film sequentially stacked on an upper surface of the polarizer; and
a light shielding layer comprising an ultraviolet (UV) absorbent,
wherein the light shielding layer is embedded in the bonding layer to constitute at least a portion of the non-display region, and the light shielding layer is on at least one surface of the first polarizer protective film,
wherein the UV absorbent is present in an amount of about 0.05 wt % to about 5 wt % in the light shielding layer,
wherein the bonding layer comprises a UV curable bonding agent,
wherein the light shielding layer is formed from a heat-curable composition for light shielding layer, and
wherein the light shielding layer comprises:
a continuous non-printed region in the non-display region, and
a printed region comprising a plurality of printed patterns separated from each other by the continuous non-printed region, the printed patterns comprising:
a first printed layer and a second printed layer directly formed on the first printed layer, the second printed layer having a shape different from the first printed layer.
2. The polarizing plate according to claim 1 , wherein the UV absorbent is further present on at least one surface of the light shielding layer.
3. The polarizing plate according to claim 1 , wherein the UV absorbent has a maximum absorption wavelength of about 380 nm to about 420 nm.
4. The polarizing plate according to claim 1 , wherein the UV absorbent comprises at least one selected from benzophenone, triazine, benzotriazole, oxanilide, phenyl salicylate, salicylate, cyanoacrylate, cinnamate, indole, azo, and naphthalene diimide-based UV absorbents.
5. The polarizing plate according to claim 1 , wherein the UV absorbent comprises at least one selected from a benzophenone-based UV absorbent and a triazine-based UV absorbent.
6. The polarizing plate according to claim 5 , wherein the benzophenone-based UV absorbent comprises a compound represented by Formula 1:
wherein R 1 is a C 1 to C 4 alkyl group; R 2 and R 3 are each independently a hydroxyl group, a C 1 to C 8 alkoxy group, or a halogen; n and m are each independently an integer of 0 to 5; and n+m is an integer of 5 or less.
7. The polarizing plate according to claim 5 , wherein the triazine-based UV absorbent comprises a hydroxy phenyl triazine UV absorbent.
8. The polarizing plate according to claim 1 , wherein the light shielding layer further comprises a UV stabilizer.
9. The polarizing plate according to claim 8 , wherein the UV stabilizer is present in an amount of about 0.05 wt % to about 3 wt % in the light shielding layer.
10. The polarizing plate according to claim 8 , wherein the UV stabilizer further comprises at least one selected from a hindered amine-based UV stabilizer and a metal complex salt-based UV stabilizer.
11. The polarizing plate according to claim 1 , wherein the heat-curable composition for light shielding layer comprises a pigment, a binder resin, a heat-curing initiator, and the UV absorbent.
12. The polarizing plate according to claim 11 , wherein the pigment comprises at least one selected from carbon black and a silver-tin alloy.
13. The polarizing plate according to claim 11 , wherein the binder resin comprises at least one selected from an acrylic resin, a polyimide resin, and a polyurethane resin.
14. The polarizing plate according to claim 1 , wherein the heat-curable composition for light shielding layer further comprises a thermosetting unsaturated compound.
15. The polarizing plate according to claim 1 , wherein the heat-curable composition for light shielding layer comprises the UV absorbent.
16. The polarizing plate according to claim 1 , wherein the light shielding layer has a thickness of about 5 μm or less.
17. The polarizing plate according to claim 1 , further comprising a second polarizer protective film on a lower surface of the polarizer.
18. The polarizing plate according to claim 1 , wherein the polarizing plate has an a* variation rate of about 50% or less, as calculated by Equation 1:
a *variation rate=|( a *)500 h−( a *)0 h|/|( a *)0 h|×100, Equation 1
wherein (a*)0 h is an a* value measured on the light shielding layer of the polarizing plate prior to irradiation, and (a*)500 h is an a* value measured on the light shielding layer of the polarizing plate after irradiation of the polarizing plate with sunlight for 500 hours.
19. The polarizing plate according to claim 1 , wherein the polarizing plate has a b* variation rate of about 200% or less, as calculated by Equation 2:
b *variation rate=|( b *)500 h−( b *)0 h|/|( b *)0 h|×100, Equation 2
wherein (b*)0 h is a b* value measured on the light shielding layer of the polarizing plate prior to irradiation and (b*)500 h is a b* value measured on the light shielding layer of the polarizing plate after irradiation of the polarizing plate with sunlight for 500 hours.
20. The polarizing plate according to claim 1 , wherein the polarizing plate has an optical density (OD) variation rate of about 20% or less, as calculated by Equation 3:
OD variation rate=|(OD)500 h−(OD)0 h|/(OD)0 h×100, Equation 3
wherein (OD)0 h is an OD value measured on the light shielding layer of the polarizing plate prior to irradiation, and (OD)500 h is an OD value measured on the light shielding layer of the polarizing plate after irradiation of the polarizing plate with sunlight for 500 hours.
21. An optical display comprising the polarizing plate according to claim 1 .
22. A polarizing plate composed of a display region and a non-display region surrounding the display region, the polarizing plate comprising:
a polarizer;
a bonding layer and a first polarizer protective film sequentially stacked on an upper surface of the polarizer; and
a light shielding layer comprising an ultraviolet (UV) absorbent,
wherein the light shielding layer is embedded in the bonding layer to constitute at least a portion of the non-display region, and the light shielding layer is on at least one surface of the first polarizer protective film,
wherein a total thickness of the light shielding layer and the bonding layer in the non-display region is the same as a thickness of the bonding layer in the display region, and the light shielding layer is between the bonding layer and the first polarizer protective film in the non-display region,
wherein the UV absorbent is present in an amount of about 0.05 wt % to about 5 wt % in the light shielding layer,
wherein the bonding layer comprises a UV curable bonding agent,
wherein the light shielding layer is formed from a heat-curable composition for light shielding layer, and
wherein the light shielding layer comprises:
a continuous non-printed region in the non-display region, and
a printed region comprising a plurality of printed patterns separated from each other by the continuous non-printed region, the printed patterns comprising:
a first printed layer and a second printed layer directly formed on the first printed layer, the second printed layer having a shape different from the first printed layer.