An LCD device includes an LED backlight assembly, a liquid crystal display panel over the LED backlight assembly, a bottom cover covering a rear side of the LED backlight assembly, a reflecting sheet on an inner side of the bottom cover, the reflecting sheet having a plurality of through-holes corresponding to the plurality of LEDs, a main cover enclosing edges of the liquid crystal display panel and the LED backlight assembly, and a top cover covering edges of a front side of the liquid crystal display panel and combined with the main cover. The LED backlight assembly includes a plurality of LED lamps, a diffusion plate spaced apart from the plurality of LED lamps and having a light transmittance within a range of about 50% to about 90%, and a plurality of optical sheets over the diffusion plate.