Patent ID: 7075718

Claim:
A transparent screen comprising: a refraction/total reflection plate in a form of a Fresnel lens, the refraction/total reflection plate having a sawtooth light-incidence-side surface upon which light to be projected is incident, and a light-emitting-side surface via which the light to be projected exits; and an image formation/display plate for forming a projected image from light that exits from said refraction/total reflection plate, a plurality of refraction slating surface portions each for refracting an incident ray of light to be projected towards said light-emitting-side surface of said refraction/total reflection plate, a plurality of transmission slating surface portions each for making an incident ray of light to be projected pass therethrough, and a plurality of total reflection slating surface portions each for reflecting an incident ray of light passing through one of said plurality of transmission slating surface portions towards said light-emitting-side surface of said refraction/total reflection plate being formed concentrically on the sawtooth light-incidence-side surface of said refraction/total reflection plate, and said refraction/total reflection plate being formed of a transparent material in which no scattering particles are dispersedly disposed.