Backlight unit and liquid crystal display device including the same

A backlight unit, comprising:

• a light guide plate including a first incident surface;
• a light source module including a first sub-light source module overlapping the first incident surface of the light guide plate in a first direction, wherein the first sub-light source module provides light to the first incident surface;
• and
• a distance adjusting member including:
• a first sub-distance adjusting member overlapping the first incident surface of the light guide plate in the first direction and disposed at a first side of the first sub-light source module;
• and
• a second sub-distance adjusting member disposed at a second side of the first sub-light source module, which is opposite to the first side of the first sub-light source module,
• wherein the first sub-distance adjusting member and the second sub-distance adjusting member are configured to move the light guide plate in the first direction, and
• wherein each of the first sub-distance adjusting member and the second sub-distance adjusting member is a screw which moves in the first direction when the screw is rotated.