Light pipe and illuminating device having the same

1. A light pipe comprising:

an optical film in a rolled shape and having a hollow conduit; and

a supporter to surround a surface of the optical film,

wherein the supporter includes at least one of a protrusion and an indentation on a surface of the supporter,

wherein a surface roughness of the surface of the supporter ranges from approximately 3 μm to approximately 30 μm, and

wherein the optical film includes a first surface having a linear array of prisms and a second surface opposite the first surface.

2. The light pipe of claim 1 , wherein the surface roughness is based on a height distance of at least one protrusion on the surface of the supporter.

3. The light pipe of claim 2 , wherein the surface roughness is further based on a depth distance of one indentation on the surface of the supporter.

4. The light pipe of claim 1 , wherein at least one of the protrusion and the indentation is formed as one integral body with the supporter.

5. The light pipe of claim 1 , wherein the surface of the supporter is at least one of an inner surface and an outer surface of the supporter.

6. The light pipe of claim 1 , wherein at least one of the protrusion and the indentation is formed by at least one of an injection molding method, an extruding method, a thermo curing method, a UV curing method, a molding method and a roll method.

7. The light pipe of claim 1 , wherein the linear array of prisms face the supporter.

8. The light pipe of claim 1 , further comprising:

at least one of a reflector and an extractor on the supporter.

9. An illuminating device comprising:

a light source; and

a light pipe to distribute a light from the light source, the light pipe including:

an optical film in a rolled shape and having a hollow conduit, and

a supporter to surround the optical film,

wherein the supporter has at least one of a protrusion and an indentation on a surface of the supporter,

wherein a surface roughness of the surface of the supporter ranges from approximately 3 μm to approximately 30 μm, and

wherein the optical film includes a first surface having a linear array of prisms and a second surface opposite the first surface.

10. The illuminating device of claim 9 , wherein at least one of the protrusion and the indentation is formed as one integral body with the supporter.

11. The illuminating device of claim 9 , wherein the surface of the supporter is at least one of an inner surface and an outer surface of the supporter.

12. The illuminating device of claim 9 , further comprising a reflecting cap at one end of the light pipe.

13. The illuminating device of claim 12 , wherein a density of at least one of the protrusion and the indentation is larger at an area near the reflecting cap as compared to a density of at least one of the protrusion and the indentation at an area near the light source.

14. The illuminating device of claim 12 , further comprising:

at least one of a reflector and an extractor on the supporter.

15. The illuminating device of claim 14 , wherein a size of the extractor is larger at an area of the light pipe near the reflecting cap as compared to a size of the extractor at an area of the light pipe near the light source.

16. The illuminating device of claim 9 , wherein the linear array of prisms face the supporter.

17. The illuminating device of claim 9 , wherein a difference between a surface illuminance at one end of the light pipe near the light source and a surface illuminance at the other end of the light pipe distant from the light source ranges from approximately 0 cd/m 2 to approximately 450 cd/m 2 .

18. The illuminating device of claim 9 , wherein a ratio of a surface illuminance at one end of the light pipe near the light source to a surface illuminance at the other end of the light pipe distant from the light source ranges from 1:0.9 to 1:1.