Light guide plate and backlight unit including the same

A backlight unit, comprising:

• a light source configured to output light;
• and
• a light guide plate including a light incident surface which is located in the opposite side of the light source and to which the light from the light source is incident, a light output surface which is located in a direction perpendicular to the light incident surface and outputs the light to the outside, and a body of a plate form having a rear surface which is an opposite surface of the light output surface,
• wherein the body includes a flat portion formed in a space which is spaced apart from the light incident surface and having a constant thickness, and a light input portion formed in a space between the light incident surface and the flat portion and having a thickness which is changed in a greater range than that of the flat portion, and
• wherein the light input portion includes a first portion which is formed to be adjacent to the light incident surface and has a thickness which is increased, and a second portion which is formed to be adjacent to the flat portion and has a thickness which is decreased.