A projection screen includes a plurality of convex portions serving as a light
diffusion control portion, on the surface of a substrate. An optical thin film
overlies the substrate and has convex portions having the same shape as that of
the convex portions of the substrate. When external light enters the optical thin
film with light in three primary color wavelength bands, the optical thin film
reflects only the light in the three color wavelength bands and absorbs at least
visible light of the external light. When light in the three primary color wavelength
bands perpendicularly enters the optical thin film, the rays of the light have
incident angles at the convex portions of the optical thin film and diffuse-reflected
at angles twice the incident angles. Thus, a predetermined percentage of the light
is diffused to increase the viewing angle of the screen.
