Thin film polarizer, method of manufacturing the same, and polarizing plate and display device including the same

1. A method of manufacturing a thin film polarizer, comprising:

forming a film laminate by alternately bonding two or more non-oriented polymer films and two or more non-oriented polyvinyl alcohol-based films to each other using attractive force or an adhesive layer;

orienting the film laminate so that the polyvinyl alcohol-based film has a thickness of 10 μm or less after the orienting of the film laminate; and

separating the polymer films and the polyvinyl alcohol-based films of the oriented film laminate from each other.

2. The method of claim 1 , wherein the film laminate comprises a first non-oriented polyvinyl alcohol-based film, a first non-oriented polymer film bonded to the first non-oriented polyvinyl alcohol-based film, a second non-oriented polyvinyl alcohol-based film bonded to the first non-oriented polymer film, and a second non-oriented polymer film stacked on the second non-oriented polyvinyl alcohol-based film.

3. The method of claim 1 , wherein the film laminate comprises a first non-oriented polyvinyl alcohol-based film, a first non-oriented polymer film bonded to the first non-oriented polyvinyl alcohol-based film, a second non-oriented polyvinyl alcohol-based film bonded to the first non-oriented polymer film, a second non-oriented polymer film bonded to the second non-oriented polyvinyl alcohol-based film, and a third non-oriented polyvinyl alcohol-based film bonded to the second non-oriented polymer film.

4. The method of claim 1 , wherein the non-oriented polymer film is a polymer film having a maximum orientation magnification of five or more times.

5. The method of claim 1 , wherein the non-oriented polymer film is one or more selected from a group including a low-density polyethylene resin, a high-density polyethylene resin, a copolymer resin containing ethylene vinyl acetate in high-density polyethylene, a polypropylene resin, a polyurethane resin, a polyethylene terephthalate resin containing isophtalic acid, a watersoluble cellulose resin, and an acrylic resin.

6. The method of claim 1 , wherein the orienting of the film laminate is performed through dry orientation or wet orientation.

7. The method of claim 1 , wherein the orienting of the film laminate is performed at a temperature of 20° C. to 85° C. at an orientation magnification of 5 to 15 times.

8. The method of claim 1 , wherein the orienting of the film laminate is performed in a boron aqueous solution having a boron concentration ranging from 1 to 5 wt %.

9. The method of claim 1 , further comprising dyeing the non-oriented polyvinyl alcohol-based film with at least one of iodine and dichroic dye before the orienting of the film laminate.

10. The method of claim 1 , wherein adhesion between the oriented polyvinyl alcohol-based film and the oriented polymer film after the orienting of the film laminate is 2N/2 cm or less.

11. The method of claim 1 , wherein the separating of the polymer film from the polyvinyl alcohol-based film in the oriented film laminate is performed by applying 2N/2 cm or less of peel strength.

12. A thin film polarizer being manufactured through the method of claim 1 , having a thickness of 10 μm or less, group transmittance of 40 to 45%, and a degree of polarization of 99% or more.

13. The thin film polarizer of claim 12 , wherein in the thin film polarizer, a standard deviation with respect to a degree of polarization measured at 10 points positioned to have an equidistant interval between the points in a width direction of the thin film polarizer is 0. 002% or less.

14. A polarizing plate comprising the thin film polarizer of claim 12 .

15. A display device comprising the polarizing plate of claim 14 .