Provided is a photodiffusion plate comprising a light incident surface, on which a light is incident, and a light-emitting surface formed on the surface opposite to the light incident surface for diffusing and emitting the light incident on the light incident surface, wherein at least one of the light incident surface and the light-emitting surface includes recess-projection regions having a plurality of repetition units, wherein each of the repetition units includes at least one recess-projection structure having at least two surfaces, wherein at least two of the surfaces in the repetition units are rough, wherein the ratio of the rough surfaces to the surface of the entire region having the repetition units in each of the recess-projection regions is 50 % or less, and wherein at least one of the surfaces facing a rough surface in the repetition units is also rough. Further provided are a surface illuminant device and a display device having the photodiffusion plate.
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