OPTICAL SHEET AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME
Disclosed is an optical sheet and an LCD device comprising the optical sheet. The optical sheet comprises a base film; and a prism part disposed on one surface of the base film, and comprising a plurality of peaks and a plurality of valleys; wherein the prism part comprises a plurality of diffusion particles, and the prism part is arranged along a longitudinal direction and a height of each peak varies as the peak goes along the longitudinal direction.
1 . An optical sheet comprising:
a base film; and
a prism part disposed on one surface of the base film, and comprising a plurality of peaks and a plurality of valleys;
wherein the prism part comprises a plurality of diffusion particles,
and the prism part is arranged along a longitudinal direction and a height of each peak varies as the peak goes along the longitudinal direction.
2 . The optical sheet of claim 1 , further comprising;
a protecting layer disposed on the other surface of the base film, the protecting layer comprises a second resin and a plurality of beads.
3 . The optical sheet of claim 2 ,
wherein a diameter of bead is substantially 2 μm to 10 μm.
4 . The optical sheet of claim 1 ,
wherein a height of each peak varies randomly or periodically.
5 . The optical sheet of claim 1 ,
wherein the prism part comprises a first resin,
and about 1 to 10 parts by weight of the diffusion particles based on 100 parts by weight of the first resin.
6 . The optical sheet of claim 1 ,
wherein the prism part comprises a first resin,
a difference between a refractive index of the diffusion particle and a refractive index of the first resin lies substantially in a range between 0.01 and 0.5.
7 . The optical sheet of claim 1 ,
the peaks and valleys are arranged in a zigzag manner along a longitudinal direction on the prism part.
8 . An optical sheet comprising:
a base film; and
a prism part disposed on one surface of the base film, and comprising plurality of peaks and a plurality of valleys,
wherein the prism part comprises a plurality of diffusion particles,
and the prism part is arranged along a longitudinal direction and the peaks and valleys are arranged in a zigzag manner.
9 . The optical sheet of claim 8 , further comprising:
a protecting layer disposed on the other surface of the base film, the protecting layer comprises a second resin and a plurality of beads.
10 . The optical sheet of claim 9 ,
wherein a diameter of bead is substantially 2 μm to 10 μm.
11 . The optical sheet of claim 8 ,
wherein the peaks and the valleys vary randomly or periodically in a zigzag manner.
12 . The optical sheet of claim 8 ,
wherein the prism part comprises a first resin,
and about 1 to 10 parts by weight of the diffusion particles based on 100 parts by weight of the resin.
13 . The optical sheet of claim 8 ,
wherein the prism part comprises a first resin,
a difference between a refractive index of the diffusion particles and a refractive index of the resin lies substantially in a range between 0.01 and 0.5.
14 . An optical sheet comprising:
a base film; and
a prism part disposed on one surface of the base film, and comprising a first resin and a plurality of diffusion particles,
a difference between a refractive index of the diffusion particle and a refractive index of the first resin lies substantially in a range between 0.01 and 0.5.
15 . The optical sheet of claim 14 ,
wherein the diffusion particles are beads
16 . The optical sheet of claim 14 ,
wherein the prism part comprises a first resin, and about 1 to 10 parts by weight of the diffusion particles based on 100 parts by weight of the first resin.
17 . The optical sheet of claim 14 ,
wherein the diffusion particles are made of at least one selected from the group consisting of polymethylmethacrylate (PMMA), polystyrene, and silicon.
18 . The optical sheet of claim 14 ,
wherein the prism part comprises a plurality of peaks and a plurality of valleys,
and a height of each peak varies randomly along a longitudinal direction on the prism part.
19 . The optical sheet of claim 14 , further comprising:
a protecting layer disposed on the other surface of the base film, the protecting layer comprises a second resin and a plurality of beads.
20 . The optical sheet of claim 19 ,
wherein the prism part comprises a second resin, and about 10 to 50 parts by weight of the beads based on 100 parts by weight of the second resin.
21 . A liquid crystal display device comprising:
a light source;
an optical sheet disposed on the light source; and
a liquid crystal display panel disposed on the optical sheet,
wherein the optical sheet comprises,
a base film; and
a prism part disposed on one surface of the base film, and comprising a resin and a plurality of diffusion particles,
a difference between a refractive index of the diffusion particles and a refractive index of the first resin lies substantially in a range between 0.01 and 0.5.