Patent ID: 8284346
Filing Date: 2012-10-09
Classification: G02B,G02F

Abstract:
1. A backlight unit for a liquid crystal display panel, comprising: a diffusor that diffuses light emitted from a front surface thereof; a reflective plate that reflects light toward a rear surface of the diffusor; and a collimator that collimates the light emitted from the front surface of the diffusor toward the liquid crystal display panel, the collimator including: wherein when the diffused light is incident on the single flat rear surface of the base layer with an incident angle of about 5°, the light entering the first region is collimated toward the liquid crystal panel to have an azimuthal angle within a range of about 0° to about 30° in a front direction, the light entering the second region is totally reflected at a front surface of the collimating layer and toward the single flat rear surface of the base layer and is recycled by reflection on the reflective plate, and the light entering the third region is reflected at the reflective pattern and toward the diffuser and is recycled by reflection on the reflective plate.