Method for fabricating an optical sheet
View Patent ↗An optical sheet and a method for fabricating the optical sheet, wherein a diffusion pattern is formed to diffuse and condense light. The optical sheet includes a prism pattern having a plurality of mountains and ravines to condense light generated from a light source and a plurality of diffusion patterns irregularly formed on the prism pattern to diffuse the light.
1. A method for fabricating an optical sheet, comprising:
preparing a sub master by forming a prism pattern having a plurality of mountains and ravines in turn and having irregular diffusion patterns on sides of the mountains, the mountains being formed in a curved line;
preparing a main master having mountains, ravines, and irregular diffusion patterns corresponding to the mountains, ravines, and irregular diffusion patterns of the sub master; and
pressurizing a film using the main master to form an optical sheet,
wherein the preparing the sub master comprises:
scattering beads irregularly on a substrate, the beads having various sizes;
pressurizing the beads to form the irregular diffusion patterns;
removing the beads from the substrate to expose the formed irregular diffusion patterns on the substrate; and
forming the prism pattern on the irregular diffusion patterns.
2. The method of claim 1 , wherein forming the prism pattern comprises forming the mountains at irregular intervals.
3. The method of claim 2 , wherein forming the prism pattern comprises forming each mountain with a round peak.
4. A method for fabricating an optical sheet, comprising:
preparing a sub master by forming a prism pattern having a plurality of mountains and ravines in turn and forming irregular diffusion patterns on sides of the mountains, the mountains being formed in a curved line;
preparing a main master, the main master having mountains, ravines, and irregular diffusion patterns corresponding to the mountains, ravines, and irregular diffusion patterns of the sub master; and
pressurizing a film using the main master to form an optical sheet,
wherein the preparing the sub master comprises:
forming the prism pattern on a substrate;
scattering irregularly beads on the substrate, the beads having various sizes;
pressurizing the beads to form the irregular diffusion patterns; and
removing the beads from the substrate to expose the formed irregular diffusion patterns on the prism pattern.
5. The method of claim 4 , wherein forming the prism pattern comprises forming the mountains at irregular intervals.
6. The method of claim 5 , wherein forming the prism pattern comprises forming each mountain with a round peak.
7. The method of claim 1 , wherein the beads comprise diameters in a range of 10 μm to 12 μm.
8. The method of claim 7 , wherein pressurizing the beads comprises pressing down on the beads so that parts of the beads are inserted into the substrate.
9. The method of claim 1 , wherein pressurizing the beads comprises pressing down on the beads so that parts of the beads are inserted into the substrate.
10. The method of claim 4 , wherein the beads comprise diameters in a range of 10 μm to 12 μm.
11. The method of claim 10 , wherein pressurizing the beads comprises pressing down on the beads so that parts of the beads are inserted into the substrate.
12. The method of claim 4 , wherein pressurizing the beads comprises pressing down on the beads so that parts of the beads are inserted into the substrate.