1. A method for coating a display module comprising:preparing a display module comprising a plurality of luminous elements mounted on a printed circuit board;
arranging a jig along an edge of the printed circuit board, the edge of the printed circuit board provided at an edge of the display module containing the printed circuit board;
forming a coating layer that surrounds side portions of the each of the luminous elements by discharging an opaque coating solvent between each of the luminous elements and the coating also positioned at the edge of the printed circuit board provided at the edge of the display module; and
separating the jig from the printed circuit board,
wherein the forming the coating layer comprises filling up to a region that projects further than the edge of the printed circuit board with the opaque coating solvent using a slanting surface of the jig that is slanting toward an outside of the jig in a direction toward an upper side of the jig.