Antireflection film and organic light emitting display device including the same
An antireflection film includes a polarizer, a first retardation film disposed on a side of the polarizer and having a reverse wavelength dispersion phase delay, and a second retardation film disposed on at least one side of the first retardation film and including a polymer, wherein the polymer includes a structural unit derived from a monomer selected from styrene, a styrene derivative, or a combination thereof, and the polymer has a glass transition temperature of greater than about 100° C.
1. An antireflection film comprising
a polarizer,
a first retardation film disposed on a side of the polarizer and having a reverse wavelength dispersion phase delay, and
a second retardation film disposed on at least one side of the first retardation film and consisting of a polymer,
wherein the polymer comprises a structural unit derived from a monomer selected from styrene, a styrene derivative, or a combination thereof, and the polymer has a glass transition temperature of greater than about 100° C.
2. The antireflection film of claim 1 , wherein the first retardation film having the reverse wavelength dispersion phase delay is a retardation film having a λ/4 phase difference.
3. The antireflection film of claim 1 , wherein an in-plane retardation for incident light at 450 nanometers, 550 nanometers, and 650 nanometer wavelengths of the first retardation film satisfies Relationship Inequation 1:
R o1 (450 nm)≦R o1 (550 nm)≦R o1 (650 nm) Relationship Inequation 1
wherein, in Relationship Inequation 1,
R o1 (450 nm) denotes the in-plane retardation for incident light at 450 nanometers wavelength of the first retardation film,
R o1 (550 nm) denotes the in-plane retardation for incident light at 550 nanometers wavelength of the first retardation film, and
R o1 (650 nm) denotes the in-plane retardation for incident light at 650 nanometers wavelength of the first retardation film.
4. The antireflection film of claim 1 , wherein a wavelength dispersion of the first retardation film satisfies Relationship Inequation 2:
0.7≦ R o1 (450 nm)/ R o1 (550 nm)≦1.0 Relationship Inequation 2
wherein, in Relationship Inequation 2,
R o1 (450 nm) denotes the in-plane retardation for incident light at 450 nanometers wavelength of the first retardation film, and
R o1 (550 nm) denotes the in-plane retardation for incident light at 550 nanometers wavelength of the first retardation film.
5. The antireflection film of claim 1 , wherein the first retardation film further comprises refractive indices satisfying Relationship Inequation 3:
n x1 >n y1 =n z1 Relationship Inequation 3
wherein, in Relationship Inequation 3,
n x1 denotes a refractive index at a slow axis of the first retardation film,
n y1 denotes a refractive index at a fast axis of the first retardation film, and
n z1 denotes a refractive index in a direction perpendicular to n x1 and n y1 .
6. The antireflection film of claim 1 , wherein the first retardation film is a polymer film or a polymer film comprising a liquid crystal.
7. The antireflection film of claim 1 , wherein the second retardation film further comprises refractive indices satisfying Relationship Inequation 4:
n z2 >n x2 =n y2 Relationship Inequation 4
wherein, in Relationship Inequation 4,
n x2 denotes a refractive index in an in-plane x direction of the second retardation film,
n y2 denotes a refractive index in an in-plane y direction of the second retardation film, and
n z2 denotes a refractive index in a direction perpendicular to n x2 and n y2 .
8. The antireflection film of claim 1 , wherein an in-plane retardation and a thickness direction retardation of the second retardation film satisfies Relationship Inequations 5 and 6:
−10 nanometers<R o2 (550 nm)≦10 nanometers Relationship Inequation 5
−200 nanometers≦R th2 (550 nm)<−10 nanometers Relationship Inequation 6
wherein, in Relationship Inequations 5 and 6,
R o2 (550 nm) denotes the in-plane retardation at 550 nanometers wavelength of the second retardation film, and
R th2 (550 nm) denotes the thickness direction retardation at 550 nanometers wavelength of the second retardation film.
9. The antireflection film of claim 1 , wherein the polymer comprises a structural unit derived from styrene, a substituted or unsubstituted alkyl styrene, a substituted or unsubstituted aryl styrene, halogen styrene, a substituted or unsubstituted alkoxy styrene, a substituted or unsubstituted nitro styrene, a substituted or unsubstituted amino styrene, a substituted or unsubstituted carboxyl styrene, or a combination thereof.
10. The antireflection film of claim 9 , wherein the polymer further comprises a structural unit derived from a monomer selected from maleimide or a derivative thereof, maleic anhydride or a derivative thereof, acrylonitrile or a derivative thereof, methacrylonitrile or a derivative thereof, and a combination thereof.
11. The antireflection film of claim 10 , wherein the polymer comprises a structural unit derived from a monomer selected from acrylate or a derivative thereof, methacrylate or a derivative thereof, and a combination thereof.
12. The antireflection film of claim 1 , wherein the polymer comprises
a polymer comprising:
a first structural unit derived from a monomer selected from styrene or a styrene derivative,
a second structural unit derived from a monomer selected from maleimide or a derivative thereof, maleic anhydride or a derivative thereof, acrylonitrile a derivative thereof, methacrylonitrile or a derivative thereof, and a combination thereof, and
a structural unit derived from a monomer selected from an acrylate or a derivative thereof, a methacrylate or a derivative thereof, and a combination thereof.
13. The antireflection film of claim 1 , wherein the polymer has a glass transition temperature of about 110° C. to about 150° C.
14. The antireflection film of claim 1 , wherein the second retardation film is elongated by about 1.1 times to about 5.0 times.
15. The antireflection film of claim 11 , wherein the second retardation film is biaxially elongated.
16. The antireflection film of claim 1 , wherein the second retardation film has a thickness of less than or equal to about 50 μm.
17. An organic light emitting display device comprising
a display panel, and
the antireflection film of claim 1 .
18. A method of manufacture for an antireflection film comprising
disposing a polarizer on a side of a first retardation film, the first retardation film having a reverse wavelength dispersion phase delay, and
disposing a second retardation film on at least one side of the first retardation film to form the antireflection film, wherein the second retardation film further comprises a polymer, and
wherein the polymer comprises a structural unit derived from a monomer selected from styrene, a styrene derivative, and a combination thereof, wherein the polymer has a glass transition temperature of greater than about 100° C.