| 摘要 |
A backlight unit that for preventing an optical sheet from moving freely and preventing deterioration of picture quality caused by deformation. The backlight unit of a liquid crystal display device includes a light source; a reflecting sheet disposed in a rear surface of the light source; an optical sheet to direct light emitted from the light source to travel in a direction towards a liquid crystal display panel; and a cover bottom assembly formed to house the light source, the reflection sheet and the optical sheet. The cover bottom assembly comprises support side bottoms formed at two short sides of the cover bottom assembly to dispose the optical sheet thereon, and the support side bottom includes a joining part to fix the optical sheet to the support side bottom using a movable body movable on a surface of the optical sheet.
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