BACK LIGHT UNIT PROVIDING DIRECTION CONTROLLABLE COLLIMATED LIGHT BEAM AND 3D DISPLAY USING THE SAME

摘要

The present invention relates to a back light unit which controls the radiation direction of linear collimated light while generating the linear collimated light having high collimation purity and a three-dimensional image display device using the same. The back light unit for providing a direction controllable collimated light beam according to the present invention comprises a light source; a collimation lens at a focal distance from the light source to make light emitted by the light source into linear collimated light; a polarizer on the front side of the collimation lens to make the linear collimated light refracted by the optical shaft of the collimation lens for a predetermined angle. The back light unit according to the present invention is capable of providing a collimated light beam which has even brightness for a large area and which is adjusted in the radiation direction using a simple thin structure.