Patent ID: 7221507

Claim:
A screen for use in a projection-type image display apparatus having an image displaying element which includes a plurality of pixels for modulating a light from a light source so as to form an image formed by said image displaying element to be projected on said screen as an enlarged picture, said screen comprising: a Fresnel lens sheet forming Fresnel lenses on a light emission side thereof; a first sheet disposed on the light emission side of said Fresnel lens sheet; and a second sheet disposed on a light emission side of said first sheet and being adhered on a light emission surface of said first sheet; wherein said first sheet includes a plurality of lenticular lenses formed on a light incident side thereof, said lenticular lenses extending in a longitudinal direction and being arranged in a horizontal direction, light passing window portions formed at positions opposing to said lenticular lenses with light absorbing portions provided between said light passing window portions; wherein said second sheet includes a light scattering element therein, and wherein the following equations are satisfied: 1.558 ≦Lp/Fp≦ 1.649; Lp<Iph; and Ipv/Fp≧ 2; where Fp is a pitch between the Fresnel lenses formed on said Fresnel lens sheet, Lp is a pitch of the light absorbing portions provided on said first sheet, Iph is a pixel pitch of said image display element which is projected so as to form an enlarged picture on said screen in a horizontal direction, and Ipv is a pixel pitch thereof in a vertical direction.