A display apparatus comprising: a light guide plate (21, 51); a bottom chassis (25, 55) disposed below the light guide plate; and a reflective sheet (100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270) disposed on a top surface of the bottom chassis; the reflective sheet comprising: a sheet (101, 201) formed to reflect light; and a beading pattern (103, 113, 123, 133, 143, 153, 163, 173, 183, 193, 203, 213, 223, 233, 243, 253, 263, 273) formed to protrude from one surface of the sheet (101, 201); the beading pattern formed as a plurality of protrusions on one surface of the sheet (101, 201) forming a corrugated shape in a cross-section of the reflective sheet to add to rigidity of the sheet (101, 201); the corrugated shape including protrusions that are spaced apart from each other with a flat portion of the sheet (101, 201) extending between the protrusions; the corrugated shape formed such that a first external surface of the sheet (101, 201) includes a convex portion and the second external surface of the sheet, opposite the first external surface, includes a corresponding concave portion at the same position as that of the convex portion; wherein the beading pattern (103, 113, 123, 133, 143, 153, 163, 173, 183, 193, 203, 213, 223, 233, 243, 253, 263, 273) protrudes toward and contacts the light guide plate (21, 51) or the bottom chassis (25, 55), wherein the beading pattern comprises one of a plurality of polygonal headings, a plurality of circular headings (163, 173, 263, 273), a plurality of elliptic beadings, a plurality of rectilinear headings (103, 123a, 133a, 133b, 193, 203, 213, 233a, 233b), a plurality of dotted headings (113, 123b, 213, 223a, 223b) parallel to one edge (111a, 201a) of the sheet, and a grid pattern beading (133, 233), wherein dotted headings are rectilinear beads having a short length that are formed at predetermined intervals along the long edge of the sheet. a light guide plate (21, 51); a bottom chassis (25, 55) disposed below the light guide plate; and a reflective sheet (100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270) disposed on a top surface of the bottom chassis; the reflective sheet comprising: a sheet (101, 201) formed to reflect light; and a beading pattern (103, 113, 123, 133, 143, 153, 163, 173, 183, 193, 203, 213, 223, 233, 243, 253, 263, 273) formed to protrude from one surface of the sheet (101, 201); the beading pattern formed as a plurality of protrusions on one surface of the sheet (101, 201) forming a corrugated shape in a cross-section of the reflective sheet to add to rigidity of the sheet (101, 201); the corrugated shape including protrusions that are spaced apart from each other with a flat portion of the sheet (101, 201) extending between the protrusions; the corrugated shape formed such that a first external surface of the sheet (101, 201) includes a convex portion and the second external surface of the sheet, opposite the first external surface, includes a corresponding concave portion at the same position as that of the convex portion; wherein the beading pattern (103, 113, 123, 133, 143, 153, 163, 173, 183, 193, 203, 213, 223, 233, 243, 253, 263, 273) protrudes toward and contacts the light guide plate (21, 51) or the bottom chassis (25, 55), wherein the beading pattern comprises one of a plurality of polygonal headings, a plurality of circular headings (163, 173, 263, 273), a plurality of elliptic beadings, a plurality of rectilinear headings (103, 123a, 133a, 133b, 193, 203, 213, 233a, 233b), a plurality of dotted headings (113, 123b, 213, 223a, 223b) parallel to one edge (111a, 201a) of the sheet, and a grid pattern beading (133, 233), wherein dotted headings are rectilinear beads having a short length that are formed at predetermined intervals along the long edge of the sheet. a sheet (101, 201) formed to reflect light; and a beading pattern (103, 113, 123, 133, 143, 153, 163, 173, 183, 193, 203, 213, 223, 233, 243, 253, 263, 273) formed to protrude from one surface of the sheet (101, 201); the beading pattern formed as a plurality of protrusions on one surface of the sheet (101, 201) forming a corrugated shape in a cross-section of the reflective sheet to add to rigidity of the sheet (101, 201); the corrugated shape including protrusions that are spaced apart from each other with a flat portion of the sheet (101, 201) extending between the protrusions; the corrugated shape formed such that a first external surface of the sheet (101, 201) includes a convex portion and the second external surface of the sheet, opposite the first external surface, includes a corresponding concave portion at the same position as that of the convex portion; wherein the beading pattern (103, 113, 123, 133, 143, 153, 163, 173, 183, 193, 203, 213, 223, 233, 243, 253, 263, 273) protrudes toward and contacts the light guide plate (21, 51) or the bottom chassis (25, 55), wherein the beading pattern comprises one of a plurality of polygonal headings, a plurality of circular headings (163, 173, 263, 273), a plurality of elliptic beadings, a plurality of rectilinear headings (103, 123a, 133a, 133b, 193, 203, 213, 233a, 233b), a plurality of dotted headings (113, 123b, 213, 223a, 223b) parallel to one edge (111a, 201a) of the sheet, and a grid pattern beading (133, 233), wherein dotted headings are rectilinear beads having a short length that are formed at predetermined intervals along the long edge of the sheet.