Light guide plate, and backlight unit and display device including the same

A backlight unit comprising:

• a light source configured to project light;
• and
• a light guide plate,
• wherein the light guide plate includes a light incident surface which faces the light source and receives the light projected from the light source, a light output surface which is perpendicular to the light incident surface and outputs the light to the outside, and a reflective surface opposite the light output surface, and a reflection pattern provided on the reflective surface,
• wherein the reflection pattern includes an embossed portion having a circular shape and configured to protrude from the reflective surface when viewed in a direction perpendicular to the reflective surface, and a concave portion having a ring shape which surrounds the embossed portion and recessed in the reflective surface when viewed in a direction perpendicular to the reflective surface, and an outer portion having a ring shape which surrounds the concave portion when viewed in a direction perpendicular to the reflective surface, the outer portion protruding from the reflective surface to the outside,
• wherein the embossed portion has a recessed region,
• wherein the recessed region is in a shape having a major axis and a minor axis when viewed in a direction perpendicular to the reflective surface,
• wherein in the embossed portion, a protruding height of one side and a protruding height of the other side are different based on the recessed region in each cross sectional view perpendicular to the reflective surface and the major axis of the recessed region,
• wherein a side having the higher protruding height is positioned close to the light incident surface, and
• wherein the center of the ring forming the outer portion is different from the centers of a circle forming the embossed portion and the ring forming the concave portion.