Patent ID: 8860908

Claim:
A backlight unit, comprising: a light source; and a light guide panel having a light receiving portion disposed on a side surface of the light guide panel, the light receiving portion receiving light emitted from the light source and having a pattern including a plurality of protrusions, each of the protrusions having inclined surfaces forming an angle with respect to a tangential direction of the light receiving portion and a third surface intersecting the inclined surfaces and a major surface of the light guide panel, the inclined surfaces including a first inclined surface relatively close to a center of the light receiving portion and a second inclined surface relatively close to an edge of the light receiving portion, a first inclination angle formed by the first inclined surface with respect to the tangential direction of the light receiving portion being smaller at the edge of the light receiving portion than at the center of the light receiving portion, and a length of an edge of each protrusion being inversely proportional to a distance of the same protrusion from the center of the light receiving portion, wherein the edge of each protrusion is formed by intersecting the major surface of the light guide panel by the third surface of the same protrusion.