Patent attributes
In a hologram screen for reproducing an image based on an output light obtained by scattering and diffusing an image light from an image projector, when a white light (image light) is projected on the hologram screen; and when a distance between two points at optional two points A and B on a surface of the hologram screen is given by 20 cm or less, and a value of the CIE 1976 chromaticity coordinate (u′, v′) at the point A is given by (u′A, v′A) and the value of the CIE 1976 chromaticity coordinate (u′, v′) at the point B is given by (u′B, v′B); the output light perpendicularly from the surface of the hologram screen has a color distribution in which a color difference Δu′v′between two points A and B is derived from the following formula (1) and given by 0.06 or less, where, the formula (1) is expressed by,Δu′v′=[(u′A−u′B)2+(v′A−v′B)2]1/2 (1)
