Abstract: An electronic device and a manufacturing method thereof are provided. The electronic device includes a substrate, a plurality of light-emitting elements, and a reflective structure. A plurality of light-emitting elements is disposed on the substrate. The reflective structure is disposed on the substrate and located between adjacent two of the plurality of light-emitting elements. The thickness of the reflective structure is designated as Y1, half of a pitch between the adjacent two of the plurality of light-emitting elements is designated as X1, and the light that is emitted by one of the adjacent two of the plurality of light-emitting elements has an emitting angle, and half of the emitting angle is designated as ?. X1, ?, and Y1 conform to the following relationship: X1×0.5×tan(90??)?Y1?X1×1.8×tan(90??).

Abstract: A light emitting device, including a substrate, a light guiding element, multiple light sources, and multiple reflecting films. The light guiding element is disposed on the substrate and has multiple through holes. The light sources are disposed on the substrate and are respectively disposed in the through holes. The reflecting films respectively overlap with the light sources.