An illumination assembly is adapted to illuminate a display module that is visible by reflecting environmental lights. The illumination assembly includes a substrate, a visual-light source, and a light guide. The substrate includes a top surface. The visual-light source is disposed on the top surface and is provided for emitting a visual light. The light guide is disposed corresponding to the top surface of the substrate. The light guide includes a light-incidence surface and a light-emergence surface. The visual light enters the light guide through the light-incidence surface and is reflected at least once. The visual light then exits the light guide through the light-emergence surface and travels along a light-emergence direction.