Backlight unit and liquid crystal display device having the same

A liquid crystal display device comprising:

• a backlight unit including a plurality of light emitting lamps disposed above a cover bottom such that the light emitting lamps are arranged at regular intervals, a diffusion plate disposed above the light emitting lamps, the diffusion plate including a transparent substrate, a light control part, having reflection patterns or scattering patterns, directly formed at a bottom of the substrate corresponding to the light emitting lamps, and lens parts mounted at a top of the substrate, and an optical film disposed above the diffusion plate, wherein the lens part is integrally formed with the substrate and the reflection patterns or scattering pattern are formed above the light emitting lamps at positions corresponding to the light emitting lamps in the longitudinal direction of the light emitting lamps in a dot structure;
• and
• a liquid crystal panel disposed above the backlight unit, the liquid crystal panel including an upper substrate and a lower substrate connected to each other while the upper substrate and the lower substrate are spaced a predetermined distance from each other such that liquid crystal is filled in the space between the upper substrate and the lower substrate.