A display module comprising: a display panel; a backlight unit comprising a plurality of light emitting diodes, wherein the backlight unit is disposed behind the display panel to illuminate the display panel; a bottom chassis to accommodate the backlight unit therein; and a reflective sheet disposed inside the bottom chassis so as to allow light coming from the backlight unit to be reflected toward the display panel, wherein the reflective sheet comprises: a sheet rear surface portion corresponding to a inner surface of the bottom chassis; and a sheet side surface portion which is disposed at an oblique angle to the sheet rear surface portion and extends towards the display panel; wherein at least some of the light emitting diodes are disposed adjacent to the sheet side surface portion; and a plurality of light adjustment portions are provided in the sheet side surface portion of the reflective sheet to reduce or disperse light reflected by the sheet side surface portion; the light adjustment portions are spaced apart from each other; characterized in that: each of the light adjustment portions comprises a plurality of elongate slits extending in a first direction parallel to the rear surface of the bottom chassis and parallel to a peripheral edge of the sheet rear portion; wherein the elongate slits are disposed next to one another in a direction perpendicular to the lengthwise direction; the elongate slits are linearly-shaped cuts in the sheet side surface portion; wherein each light adjustment portion corresponds to a light emitting diode disposed adjacent to the sheet side surface portion; and portions adjacent to the slits are deformed convexly or concavely defined by the process of forming the elongate slits of each of light adjustment portions by cutting the sheet side surface portion. a display panel; a backlight unit comprising a plurality of light emitting diodes, wherein the backlight unit is disposed behind the display panel to illuminate the display panel; a bottom chassis to accommodate the backlight unit therein; and a reflective sheet disposed inside the bottom chassis so as to allow light coming from the backlight unit to be reflected toward the display panel, wherein the reflective sheet comprises: a sheet rear surface portion corresponding to a inner surface of the bottom chassis; and a sheet side surface portion which is disposed at an oblique angle to the sheet rear surface portion and extends towards the display panel; wherein at least some of the light emitting diodes are disposed adjacent to the sheet side surface portion; and a sheet rear surface portion corresponding to a inner surface of the bottom chassis; and a sheet side surface portion which is disposed at an oblique angle to the sheet rear surface portion and extends towards the display panel; wherein at least some of the light emitting diodes are disposed adjacent to the sheet side surface portion; and a plurality of light adjustment portions are provided in the sheet side surface portion of the reflective sheet to reduce or disperse light reflected by the sheet side surface portion; the light adjustment portions are spaced apart from each other; characterized in that: each of the light adjustment portions comprises a plurality of elongate slits extending in a first direction parallel to the rear surface of the bottom chassis and parallel to a peripheral edge of the sheet rear portion; wherein the elongate slits are disposed next to one another in a direction perpendicular to the lengthwise direction; the elongate slits are linearly-shaped cuts in the sheet side surface portion; wherein each light adjustment portion corresponds to a light emitting diode disposed adjacent to the sheet side surface portion; and portions adjacent to the slits are deformed convexly or concavely defined by the process of forming the elongate slits of each of light adjustment portions by cutting the sheet side surface portion. each of the light adjustment portions comprises a plurality of elongate slits extending in a first direction parallel to the rear surface of the bottom chassis and parallel to a peripheral edge of the sheet rear portion; wherein the elongate slits are disposed next to one another in a direction perpendicular to the lengthwise direction; the elongate slits are linearly-shaped cuts in the sheet side surface portion; wherein each light adjustment portion corresponds to a light emitting diode disposed adjacent to the sheet side surface portion; and portions adjacent to the slits are deformed convexly or concavely defined by the process of forming the elongate slits of each of light adjustment portions by cutting the sheet side surface portion.