Abstract: A backlight unit capable of producing a bi-directional surface light while using a single light guide plate without a conventional reflecting plate is disclosed. The backlight unit of bi-directional irradiation, used for upper and lower liquid crystal display (LCD) panels, has at least one fluorescent lamp accommodated in a mold frame to generate light, and at least one lamp reflector surrounding the fluorescent lamp to reflect the light generated from the fluorescent lamp. The backlight unit further has a single light guide plate, which is disposed between the upper and lower LCD panels and near the fluorescent lamp, which has hole patterns formed on a central horizontal plane thereof, and in which the hole patterns produce a bi-directional surface light in upward and downward directions by scattering the light reflected from the lamp reflector.

Abstract: Disclosed is a back light unit for liquid crystal display device (LCD). The back light unit for LCD includes a lamp reflector reflecting a lamp light toward a light guiding plate and directly fixed with screws to protrued parts of the light guiding plate which is substituting for mold frame; a reflecting sheet, a diffusing sheet and upper and lower prism sheets attached directly to the light guiding plate by means of a double stick tape respectively; and guiding ribs serving as assembly base formed on each corner of the light guiding plate.