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

A backlight unit comprising:

• a light source configured to output light;
• and
• a light guide plate including a light incident surface positioned to face the light source and configured to receive the light emitted from the light source, a light output surface connected to the light incident surface and configured to output the light in a direction of a display panel, and a reflective surface opposite the light output surface,
• wherein a plurality of dot patterns are formed on the reflective surface to change a path of the output light,
• wherein each of the dot patterns includes a central embossed portion formed in a circular shape, a concave portion formed in a ring shape which surrounds the central embossed portion, and an outer embossed portion formed on an outer circumference surface of the concave portion and configured to scatter light moved to the central embossed portion and the concave portion,
• wherein the outer embossed portion is formed in a ring shape along the outer circumference surface of the concave portion,
• wherein the center of the ring forming the outer embossed portion is different from the centers of the circle forming the central embossed portion and the ring forming the concave portion,
• wherein in the outer embossed portion, a height and thickness of a region close to a first side surface of the side surfaces is greater than those of a region close to a second side surface facing the first side surface of the side surfaces, and
• wherein the first side surface is a light incident surface which receives light from a light source.