Patent ID: 6144491
Filing Date: 2000-11-07
Classification: G03B

Abstract:
A reflection-type projection screen, comprising:a light-reflecting layer;a light-diffusing layer including a projection-light-receiving surface and a light-reflecting surface;an achromatic-light-absorbing means;said light-reflecting layer comprising a layer made from a transparent resin and having flakes of a light-reflective material with flat surfaces dispersed therein in a manner that the flat surfaces are substantially parallel to said projection-light-receiving surface;said light-diffusing layer comprising a layer made from a transparent resin and having fine crystalline particles of calcite with flat surfaces dispersed therein in a manner that the flat surfaces of at least a portion of the calcite particles are not parallel to said projection-light-receiving surface; andsaid achromatic-light absorbing means being selected from the group consisting of:(i) an achromatic pigment, a dye, or a combination thereof, dispersed in said light-diffusing layer,(ii) an achromatic pigment, a dye, or a combination thereof dispersed in said light-diffusing layer, and a layer provided between said light-diffusing layer and said light-reflecting layer and comprising a transparent resin and an achromatic pigment, a dye, or a combination thereof, dispersed in the transparent resin,(iii) a patterned light-absorbing layer provided on the projection-light-receiving surface side of said light-diffusing layer,(iv) a patterned light-absorbing layer provided on the light-reflecting surface side of said light-diffusing layer, and(v) a layer provided between said light-diffusing layer and said light-reflecting layer and comprising a transparent resin and an achromatic pigment, a dye, or a combination thereof, dispersed in the transparent resin.