A display apparatus comprising: a display panel; and a backlight unit positioned at a rear side of the display panel, wherein the backlight unit comprises: a support member comprising a rectangular central portion and side portions (34a, 34b) extending from the four edges of the central portion toward the display panel; a plurality of light sources disposed at the central portion and configured to emit light; a plurality of lenses correspondingly disposed on the plurality of light sources and configured to disperse the light emitted from the plurality of light sources; and a reflective sheet positioned at a front side of the support member, comprising a plurality of openings at which the plurality of the lenses is positioned, the reflective sheet comprising a reflective central portion covering the central portion, reflective side portions (38a, 38b) covering the side portions (34a, 34b), and a plurality of scattering members protruding from the reflective side portion (38a, 38b), wherein the side portions (34a, 34b) comprise: first side portions disposed on a first pair of opposing edges of the central portion and inclinedly extending from the central portion toward the display panel by a first length (Da); and second side portions disposed on a second pair of opposing edges of the central portion and inclinedly extending from the central portion by a second length (Db) shorter than the first length (Da), wherein the plurality of lenses comprises refractive lenses adjacent to the first side portions and the second side portions, wherein each of the refractive lenses has an elliptical shape from the front view thereof, a width of which is a first width (La) along a long axis, which is parallel to the second pair of opposing edges of the central portion, and another width of which is a second width (Lb) along a short axis, the second width (Lb) being shorter than the first width (La). a display panel; and a backlight unit positioned at a rear side of the display panel, wherein the backlight unit comprises: a support member comprising a rectangular central portion and side portions (34a, 34b) extending from the four edges of the central portion toward the display panel; a plurality of light sources disposed at the central portion and configured to emit light; a plurality of lenses correspondingly disposed on the plurality of light sources and configured to disperse the light emitted from the plurality of light sources; and a reflective sheet positioned at a front side of the support member, comprising a plurality of openings at which the plurality of the lenses is positioned, the reflective sheet comprising a reflective central portion covering the central portion, reflective side portions (38a, 38b) covering the side portions (34a, 34b), and a plurality of scattering members protruding from the reflective side portion (38a, 38b), a support member comprising a rectangular central portion and side portions (34a, 34b) extending from the four edges of the central portion toward the display panel; a plurality of light sources disposed at the central portion and configured to emit light; a plurality of lenses correspondingly disposed on the plurality of light sources and configured to disperse the light emitted from the plurality of light sources; and a reflective sheet positioned at a front side of the support member, comprising a plurality of openings at which the plurality of the lenses is positioned, the reflective sheet comprising a reflective central portion covering the central portion, reflective side portions (38a, 38b) covering the side portions (34a, 34b), and a plurality of scattering members protruding from the reflective side portion (38a, 38b), wherein the side portions (34a, 34b) comprise: first side portions disposed on a first pair of opposing edges of the central portion and inclinedly extending from the central portion toward the display panel by a first length (Da); and second side portions disposed on a second pair of opposing edges of the central portion and inclinedly extending from the central portion by a second length (Db) shorter than the first length (Da), wherein the plurality of lenses comprises refractive lenses adjacent to the first side portions and the second side portions, wherein each of the refractive lenses has an elliptical shape from the front view thereof, a width of which is a first width (La) along a long axis, which is parallel to the second pair of opposing edges of the central portion, and another width of which is a second width (Lb) along a short axis, the second width (Lb) being shorter than the first width (La). first side portions disposed on a first pair of opposing edges of the central portion and inclinedly extending from the central portion toward the display panel by a first length (Da); and second side portions disposed on a second pair of opposing edges of the central portion and inclinedly extending from the central portion by a second length (Db) shorter than the first length (Da), wherein the plurality of lenses comprises refractive lenses adjacent to the first side portions and the second side portions, wherein each of the refractive lenses has an elliptical shape from the front view thereof, a width of which is a first width (La) along a long axis, which is parallel to the second pair of opposing edges of the central portion, and another width of which is a second width (Lb) along a short axis, the second width (Lb) being shorter than the first width (La).