Patent ID: 8439552

Claim:
A backlight unit of a display apparatus, the backlight unit comprising: a display housing; a light source which is arranged along an inner circumference of the display housing; a light guide plate through which light of the light source is transmitted, and which forms surface light; an optical sheet which is disposed on an upper side of the light guide plate to upwardly diffuse the light of the light source transmitted through the light guide plate; a plurality of first fixing units, each of which fix locations of the light guide plate and the optical sheet; a plurality of second fixing units which support the light guide plate; and a support frame which is connected to the display housing to fix the optical sheet to the display housing provisionally, and has a window formed on a surface corresponding to the light guide plate to allow light to pass therethrough, wherein the light source, the light guide plate, the first fixing units, and the second fixing units are disposed between the display housing and the support frame, wherein the first fixing units comprise a first fixing projection which is a part separate from the display housing and the second fixing units comprise a second fixing projection which is a separate component part, wherein the first fixing projection comprises: a first portion which supports the optical sheet; and a second portion which supports the light guide plate, wherein a diameter of the first portion is smaller than a diameter of the second portion.