A method of manufacturing an electronic device includes providing a mold with a first opening defined therein and including a projection portion disposed in the first opening, forming, in the first opening, a first layer including a first material through an inkjet printing method, disposing the mold on a display panel in a way such that the first opening faces the display panel, and forming a display module by removing the mold. The display module is provided with a second opening defined therein and corresponding to the projection portion.