| 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'<SUB>A</SUB>, v'<SUB>A</SUB>) and the value of the CIE 1976 chromaticity coordinate (u', v') at the point B is given by (u'<SUB>B</SUB>, v'<SUB>B</SUB>); 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, <?in-line-formulae description="In-line Formulae" end="lead"?>Deltau'v'=[(u'<SUB>A</SUB>-u'<SUB>B</SUB>)<SUP>2</SUP>+(v'<SUB>A</SUB>-v'<SUB>B</SUB>)<SUP>2</SUP>]<SUP>1/2</SUP> (1)<?in-line-formulae description="In-line Formulae" end="tail"?> 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, <?in-line-formulae description="In-line Formulae" end="lead"?>H/2L= 0.1 (2)<?in-line-formulae description="In-line Formulae" end="tail"?> 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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