Method of manufacturing polarizing plate and display device including polarizing plate
A method of manufacturing a polarizing plate includes: preparing a polarizer including a dichroic material, the polarizer being configured to polarize incident light; forming a protective film on at least one surface of the polarizer; and forming at least one transmission region by selectively radiating a femtosecond laser onto the polarizer, a group transmittance of the at least one transmission region being 80% or more.
1. A method of manufacturing a polarizing plate, the method comprising:
preparing a polarizer comprising a dichroic material, the polarizer being configured to polarize incident light;
forming a protective film on at least one surface of the polarizer; and
forming at least one transmission region by selectively radiating a femtosecond laser onto the polarizer, a group transmittance of the at least one transmission region being 80% or more.
2. The method of claim 1 , wherein the dichroic material comprises at least one of iodine and an organic dye.
3. The method of claim 2 , wherein preparing the polarizer comprises:
preparing a polyvinyl alcohol-based resin film;
stretching the resin film; and
arranging iodine molecules and organic dye molecules in the stretching direction of the resin film by immersing the resin film in at least one solution comprising the iodine and the organic dye.
4. The method of claim 1 , wherein the protective film comprises triacetyl cellulose.
5. The method of claim 1 , wherein:
a pulse width of the femtosecond laser is 100 femtoseconds to 500 femtoseconds; and
a wavelength of the femtosecond laser is 350 nm to 600 nm.
6. The method of claim 1 , wherein the femtosecond laser is radiated using a frequency of 100 KHz to 200 KHz and a power of 1 W or less.
7. The method of claim 1 , wherein the femtosecond laser is radiated one to ten times in the at least one transmission region.
8. The method of claim 1 , wherein a group transmittance of polarization regions of the polarizer excluding the at least one transmission region is 40% to 45%.
9. The method of claim 1 , further comprising:
forming a barrier film on the protective film.
10. The method of claim 9 , wherein:
a water vapor transmission rate of the barrier film is 10 −2 g/m 2 per day or less; and
a transmittance of the barrier film is 90% or more.
11. The method of claim 1 , further comprising:
forming a surface treatment film on the protective film; and
forming a barrier film on the surface treatment film.
12. The method of claim 11 , wherein the surface treatment film comprises an acryl-based resin.
13. The method of claim 11 , wherein:
a water vapor transmission rate of the barrier film is 10 −2 g/m 2 per day or less; and
a transmittance of the barrier film is 90% or more.