Polarizing plate, fabrication method thereof, and display device using the same

1. A polarizing plate comprising:

a polarizing element;

a first adhesive layer formed on a first surface of the polarizing element;

a second adhesive layer formed on a second surface of the polarizing element which is disposed on the opposite side of the first surface;

a protective film attached to the first adhesive layer;

a bonding layer attached to the second adhesive layer; and

a luminance enhancement film attached to the bonding layer.

2. The polarizing plate of claim 1 , wherein the first adhesive layer and the second adhesive layer are made of the same material.

3. The polarizing plate of claim 1 , wherein the polarizing element is a polyvinyl alcohol (PVA)-based polarizing film in which molecule chains containing an iodine-based compound or dichroic polarizing material are oriented in a certain direction.

4. The polarizing plate of claim 1 , wherein the protective film is made of a polymer selected from the group consisting of a polyester-based polymer, a styrene-based polymer, a cellulose-based polymer, a polyethersulfone-based polymer, a polycarbonate-based polymer, an acrylic polymer, a polyolefin-based polymer, a polyamide-based polymer, a polyimide-based polymer, a sulfone-based polymer, a polyether sulfone-based polymer, a polyether ether ketone-based polymer, a polyphenylene sulfide-based polymer, a vinyl alcohol-based polymer, a vinylidene chloride-based polymer, a vinyl butyral-based polymer, an arylate-based polymer, a polyoxymethylene-based polymer, an epoxy-based polymer, or any mixture thereof.

5. The polarizing plate of claim 1 , wherein the bonding layer is made of one or more types selected from the group consisting of an acrylic copolymer, an epoxy-based resin, a polyurethane-based resin, a silicon-based resin, a polyether-based resin, a polyamide-based resin, and a PVA-based resin.

6. The polarizing plate of claim 1 , wherein the bonding layer includes first bonding layer and second bonding layer, each having a different modulus.

7. The polarizing plate of claim 6 , wherein the modulus of the first bonding layer ranges from about 1 to 500 MPa, and the modulus of the second bonding layer ranges from about 0.01 to 0.5 MPa.

8. The polarizing plate of claim 7 , wherein the first bonding layer is attached to the second adhesive layer.

9. The polarizing plate of claim 1 , wherein the luminance enhancement film is a multilayer reflective polarizer.

10. The polarizing plate of claim 1 , wherein the luminance enhancement film is a multilayer reflective film fabricated by sequentially coating a plurality of layers each having a different refractive index.

11. The polarizing plate of claim 1 , wherein the luminance enhancement film is a nano-wire grid polarizer including a transparent film, a nano-structure formed on one surface of the transparent film, and a metal layer formed on the nano-structure.

12. A display device comprising the polarizing plate of claim 1 .

13. The display device of claim 12 , wherein the display device is a liquid crystal display (LCD).

14. The display device of claim 13 , wherein a driving mode of the LCD is an in-plane switching (IPS) mode, a twisted nematic (TN) mode, a vertically aligned (VA) mode, or a fringe field switching (FFS) mode.

15. The display device of claim 12 , wherein the display device is an organic electroluminescence (EL).

16. A method for fabricating a polarizing plate, the method comprising:

positioning a protective film on a first surface of a polarizing element and positioning a bonding layer on a second surface of the polarizing element which is disposed on the opposite side of the first surface;

interposing an adhesive between the protective film and the polarizing element and between the bonding layer and the polarizing element;

attaching the protective film and the bonding layer to the polarizing element by the medium of the adhesive and drying the same; and

attaching a luminance enhancement film to the bonding layer.

17. The method of claim 16 , wherein the drying is performed from 20° C. to 100° C.

18. The method of claim 17 , wherein the drying is performed from 40° C. to 90° C.