Back light unit and liquid crystal display module using the same

摘要

A back light unit capable of achieving a reduction in thickness and manufacturing costs is disclosed. The back light unit includes light sources arranged in parallel, to emit light, a case receiving the light sources, a diffuser plate diffusing the light from the light sources, condensers laminated on the diffuser plate and having predetermined thicknesses, and a diffuser interposed between the adjacent condensers. The distance from the lamps to the diffuser plate is reduced by the diffuser plate and the optical sheets (three or four sheets) laminated over the diffuser plate, to reduce the total thickness of the back light unit. Also, the number of lamps is reduced by 2 to 4, as compared to the conventional back light unit, so that the manufacturing costs of the back light unit is reduced. The brightness difference exhibited on the display screen is also reduced, so that a brightness uniformity is achieved.

主权项

1. A back light unit comprising:
a diffuser plate configured to diffuse light from a plurality of light source units positioned under the diffuser plate; a plurality of condensers disposed on the diffuser plate; and a diffuser interposed between at least two of the plurality of condensers; wherein each of the plurality of condensers includes:
a base film having a same thickness; anda plurality of condensing patterns formed on the base film; and wherein a first of the at least two of the plurality of condensers, the diffuser, and a second of the at least two of the plurality of condensers are sequentially laminated on the diffuser plate; wherein the plurality of light source units are arranged in a first longitudinal direction parallel to each other; and wherein the plurality of condensing patterns extend in the first longitudinal direction.