A method includes: providing an unfinished set module for a display panel having an active area and a peripheral area adjacent to the active area and being foldable about a foldable axis extending in one direction, the active area including a hole formation area; selectively irradiating a laser beam along a path defined along a boundary between the hole formation area and the active area, the path including first paths spaced apart from each other in a direction substantially parallel to the foldable axis and second paths disposed between the first paths, at a first energy density and at second energy density different from the first energy density, wherein the laser beam is irradiated at the first energy density along the first paths and at the second energy density along the second paths; and forming a set module having a hole by removing the hole formation area from the unfinished set module.