Backlight unit and display apparatus including the same

A display device comprising:

• a display panel configured to display an image;
• and
• a backlight unit configured to provide light to the display panel, the backlight unit comprising:
• a light source unit configured to emit light;
• a light guide plate configured to receive light emitted from the light source unit;
• and
• a bottom chassis accommodating the light source unit and the light guide plate,
• wherein the bottom chassis comprises a bottom surface, a sidewall extending from the bottom surface, and an extension part extending from the sidewall,
• wherein the extension part overlaps an upper surface of the light source unit and an upper surface of the light guide plate, wherein the extension part comprises an upper surface and a light reflection surface disposed closer to the light guide plate than the upper surface, and
• wherein the light reflection surface comprises a plurality of surfaces angled with respect to the extension part, and wherein each of the angled surfaces faces toward the light source.