Display device

A display device comprising:

• a substrate;
• a light-emitting unit including:
• a light-emitting element mounted on the substrate;
• and
• a lens placed on an upper side of the light-emitting element;
• a reflective layer placed on an upper surface of the substrate;
• an optical sheet placed on an upper side of the reflective layer at a height spaced apart from the light-emitting unit;
• and
• a display panel placed on an upper surface of the optical sheet,
• wherein the lens comprises
• a upper recess portion formed by downwardly recessing a top surface thereof,
• and a lower recess portion formed by upwardly recessing a bottom surface thereof,
• wherein the upper recess portion has an aspheric shape that is curved at a predetermined curvature from a center of the upper recess portion toward edge,
• wherein the lower recess portion comprises a side surface and a convex surface that is convex toward a top surface of the light-emitting element,
• wherein a height of a center of the lower recess portion from the bottom surface is higher than a height of the side surface.