Patent ID: 8111351

Claim:
A backlight unit comprising: a light having a plurality of light source; a bottom cover housing the light and having a first protrusion; a support side engaging to both open ends of the bottom cover to support the light and having a second protrusion; an optical sheet disposing on the light and including a first hook having a first elliptical hole for inserting the first protrusion and a second hook having a second elliptical hole for inserting the second protusion; and a first slit between an edge of the first hook and the first elliptical hole within the first hook, and a second slit between an edge of the second hook and the second elliptical hole within the second hook, wherein the first slit is disposed around two points where a linear part and a curved part of the first elliptical hole are met; and the second slit is disposed around two points where a linear part and a curved part of the second elliptical hole are met.