| 摘要 |
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 Deltau'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, Deltau'v'=[(u'A-u'B)<2>+(v'A-v'B)<2>]<1/2> (1) Further, the output light, which is output to a viewpoint defined by the following formula (2) from the surface of the hologram screen, has the color distribution in which a color difference Deltau'v' between two points A and B is derived from the above formula (1) and given by 0.01 or less, where, the formula (2) is expressed by, H/2L=0.1 (2) in the formula (2), L is a distance between the viewpoint and a center of the hologram screen, and H is a length of the hologram screen in the direction of the height.
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