Backlight unit and liquid crystal display device employing the same

A liquid crystal display device having a liquid crystal display panel and a backlight unit arranged at a rear of the liquid crystal display panel for radiating light onto the liquid crystal display panel, wherein the backlight unit includes:

• a base substrate;
• a plurality of point light sources arranged in an array having a plurality of rows and a plurality of columns on a top surface of the base substrate;
• a diffusion plate which diffuses light emitted from the point light sources to generate a uniform transmitted light;
• and
• a plurality of reflector sheets which are mounted on the diffusion plate, and, vertically disposed over the top surface of the base substrate between rows of the point light sources, the plurality of reflector sheets reflecting light emitted from the point light sources to prevent light diffusion through the reflector sheet into adjacent luminance areas, wherein each of the point light source row is turned in synchronizing with a screen scanning of the liquid crystal display panel.

A backlight unit, comprising:

• a base substrate;
• a plurality of lines arranged as rows parallel to each other, each line being comprised of a plurality of point light sources arranged to extend along a top surface of the base substrate;
• a diffusion plate which diffuses light emitted from the point light sources to generate a uniform transmitted light;
• and
• a plurality of reflector sheets which are mounted on the diffusion plate, and, vertically disposed over the top surface of the base substrate between adjacent lines, the plurality of reflector sheets reflecting light emitted from the point light sources to prevent light diffusion through the reflector plate into adjacent luminance areas.