A projection screen includes a substrate, a plurality of prism structures, and a plurality of light absorbing structures. The substrate includes a first surface adjacent to the projector and a second surface away from the projector. The prism structures are disposed on the first surface, and each of the prism structures includes a first inclined surface, a second inclined surface, and a bottom surface. The first inclined surface is configured to receive and reflect projection light beams. There is a first angle between the first inclined surface and the bottom surface, and a second angle between the second inclined surface and the bottom surface. The first angle is less than or equal to the second angle. The light absorbing structures are respectively disposed on at least a portion of the second inclined surface of each of the prism structures. The light absorbing structures are configured to absorb ambient light.