A display device is provided. The display device includes a plurality of light emitting units and a diffuser disposed on the plurality of light emitting units. The diffuser includes a bottom surface facing the plurality of light emitting units, and the bottom surface has a plurality of protrusions. The display device also includes a supporting portion supporting the diffuser. The supporting portion is higher than the plurality of light emitting units. In a top view of the display device, the supporting portion and the protrusions of the diffuser are overlapped.