A liquid crystal display device includes: a liquid crystal panel; a backlight unit under the liquid crystal panel, the backlight unit including a light emitting diode (LED) assembly supplying a light and a light guide plate transmitting the light from the LED assembly to the liquid crystal panel; a main frame surrounding the backlight unit, the main frame including a flat portion for supporting the LED assembly and a guide wall for guiding the LED assembly, the guide wall including at least one concave portion; and a light shielding tape on the guide wall and the LED assembly, the light shielding tape including at least one open portion corresponding to the at least one concave portion.