Optical film and micro LED display comprising thereof
This invention relates to an optical film comprising a light control film, and a laminate comprising a light transmitting substrate and a hard coating layer, wherein the laminate satisfies a difference between the total haze and the internal haze, and transmission diffusion distribution, within specific ranges, and a micro-LED display comprising the same.
1 . An optical film for a micro-LED display comprising:
a light control film comprising a first pattern layer having a protrusion formed on one side, and a second pattern layer contacting the one side on which the protrusion is formed; and
a laminate comprising a light transmitting substrate, and a hard coating layer comprising a binder resin, and inorganic particles and organic particles dispersed in the binder resin,
wherein a difference (Ha−Hi) between a total haze (Ha) and an internal haze (Hi) of the laminate is 5 to 15%, and
a transmission diffusion distribution of the laminate according to the following Formula 1 is greater than 1% and less than 10%:
transmission diffusion distribution=( B/A )×100 [Formula 1]
wherein A is transmission intensity of light transmitted in the normal direction of the hard coating layer, after irradiating light in the normal direction of the light transmitting substrate, and
B is transmission diffusion intensity of light transmitted at +1° or −1° based on the normal direction of the hard coating layer, after irradiating light in the normal direction of the light transmitting substrate.
2 . The optical film for a micro-LED display according to claim 1 ,
wherein a refractive index difference between the first pattern layer and the second pattern layer is 0.03 to 0.3.
3 . The optical film for a micro-LED display according to claim 1 ,
wherein the light control film comprises two or more layers.
4 . The optical film for a micro-LED display according to claim 1 ,
wherein an inclination angle of the inclined plane of the protrusion is 50° to 80°.
5 . The optical film for a micro-LED display according to claim 1 ,
wherein the total haze of the laminate is 20% to 50%, and the internal haze of the laminate is 10% to 40%.
6 . The optical film for a micro-LED display according to claim 1 ,
wherein a specular reflection intensity rate of the laminate according to the following Formula 2 is greater than 1% and less than 10%:
Specular reflection intensity rate=( C/D )×100 [Formula 2]
in the Formula 2,
C is reflection intensity measured at 45° corresponding to specular reflection, after irradiating light at the incidence angle of 45° to the hard coating layer, and
D is reflection intensity measured at 45° corresponding to specular reflection, after irradiating light at the incidence angle of 45° to the light transmitting substrate.
7 . The optical film for a micro-LED display according to claim 1 ,
wherein the binder resin comprises multifunctional (meth)acrylate-based monomers and urethane (meth)acrylate oligomers at the weight ratio of 3:7 to 7:3.
8 . The optical film for a micro-LED display according to claim 1 ,
wherein each of the organic particles has a particle diameter of 1 μm to 10 μm, and each of the inorganic particles has a particle diameter of 1 nm to 500 nm.
9 . The optical film for a micro-LED display according to claim 1 ,
wherein a weight ratio of the organic particles and the inorganic particles is 1:0.2 to 1.5.
10 . The optical film for a micro-LED display according to claim 1 ,
wherein the binder resin comprises multifunctional (meth)acrylate-based monomers and urethane (meth)acrylate oligomers at the weight ratio of 3:7 to 7:3; and the organic particles have particle diameters of 1 μm to 10 μm and the inorganic particles have particle diameters of 1 nm to 500 nm.
11 . The optical film for a micro-LED display according to claim 1 ,
wherein two or more irregularities comprising the organic particles are formed on the surface of the hard coating layer.
12 . The optical film for a micro-LED display according to claim 1 ,
wherein a rate of two or more of the organic fine particles aggregating with each other in the thickness direction of the hard coating layer is 5% or less, based on the total organic particles.
13 . The optical film for a micro-LED display according to claim 1 ,
wherein a 10 point mean roughness (Rz) of the hard coating layer is 0.05 μm to 0.15 μm, and a mean spacing of profile irregularities (Sm) of the hard coating layer is 0.05 mm to 0.20 mm.
14 . The optical film for a micro-LED display according to claim 1 ,
wherein in-plane retardation (Re) of the light transmitting substrate, measured at a wavelength of 400 nm to 800 nm, is 5,000 to 25,000 nm.
15 . A micro-LED display comprising the optical film according to claim 1 and a display panel.
16 . The micro-LED display according to claim 15 ,
wherein the display panel has a resolution of 300 to 1000 ppi.