A light guide plate in accordance with various embodiments comprises: a body having a light incident part at a first side surface of the body; an upper optical pattern at a top side of the body; and a lower optical pattern at a bottom side of the body, wherein the lower optical pattern is an embossed pattern protruding from the bottom side of the body and having a trapezoid shape, wherein a first end of the trapezoid shape has a first width and a second end of the trapezoid shape has a second width, wherein the first end is closer to the light incident part than the second end, and wherein the first width is narrower than the second width.