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 and a protective film stacked on at least one surface of the polarizer, and the polarizer includes a hydrophobic polyvinyl alcohol resin, the polarizer has a surface roughness (Ra) of about 10 nm or less on a surface thereof facing the protective film, and the polarizing plate has a maximum metal ion-infiltration length of about 400 μm or less between the polarizer and the protective film when metal powder-containing pastes are deposited on a surface of the polarizing plate in a thickness direction thereof and left at 60° C. and 95% relative humidity (RH) for 240 hours.
1. A polarizing plate comprising a polarizer and a protective film stacked on at least one surface of the polarizer,
wherein the polarizer comprises a hydrophobic polyvinyl alcohol resin and has a surface roughness (Ra) of about 10 nm or less on a surface thereof facing the protective film,
the polarizing plate having a maximum metal ion-infiltration length of about 400 μm or less between the polarizer and the protective film when metal powder-containing pastes are deposited on a surface of the polarizing plate in a thickness direction thereof and left at 60° C. and 95% relative humidity (RH) for 240 hours.
2. The polarizing plate according to claim 1 , wherein the polarizer has a surface roughness (Rz) of about 0 nm to about 80 nm on the surface thereof facing the protective film and a surface roughness (Rq) of about 0 nm to about 20 nm on the surface thereof facing the protective film.
3. An optical display apparatus comprising the polarizing plate according to claim 2 .
4. The polarizing plate according to claim 1 , wherein the polarizer has a difference of about 5 nm or less in surface roughness (Ra) between opposite surfaces thereof.
5. An optical display apparatus comprising the polarizing plate according to claim 4 .
6. The polarizing plate according to claim 1 , wherein the hydrophobic polyvinyl alcohol resin contains an unsubstituted C 1 to C 20 hydrocarbon group as a hydrophobic functional group.
7. An optical display apparatus comprising the polarizing plate according to claim 6 .
8. The polarizing plate according to claim 1 , wherein the hydrophobic polyvinyl alcohol resin comprises a copolymer of a monomer mixture comprising at least one vinyl ester monomer and a monomer providing a hydrophobic functional group.
9. The polarizing plate according to claim 8 , wherein the monomer providing the hydrophobic functional group comprises a monomer having a C 1 to C 20 hydrocarbon repeat unit.
10. An optical display apparatus comprising the polarizing plate according to claim 9 .
11. An optical display apparatus comprising the polarizing plate according to claim 8 .
12. The polarizing plate according to claim 1 , wherein the polarizer has a thickness of about 12 μm or less.
13. An optical display apparatus comprising the polarizing plate according to claim 12 .
14. The polarizing plate according to claim 1 , wherein the protective film comprises at least one selected from among a cellulose ester resin, a cyclic polyolefin resin, a polycarbonate resin, a polyester resin, a polyether sulfone resin, a polysulfone resin, a polyamide resin, a polyimide resin, a non-cyclic polyolefin resin, a polyacrylate resin, a polyvinyl alcohol resin, a polyvinyl chloride resin, a polyvinylidene chloride resin, and an acrylic resin.
15. An optical display apparatus comprising the polarizing plate according to claim 14 .
16. The polarizing plate according to claim 1 , wherein the polarizer is bonded to the protective film via a bonding layer, the bonding layer having a thickness of about 0.01 μm to about 10 μm.
17. An optical display apparatus comprising the polarizing plate according to claim 16 .
18. An optical display apparatus comprising the polarizing plate according to claim 1 .