| 摘要 |
The present invention relates to a compact and inexpensive 3D image display apparatus and others with a structure enabling color display of a clear 3D image even with use of a spatial light modulator of a low resolution. The 3D image display apparatus has an illumination light source section, a transmission type spatial light modulator, lenses, and a mask. The illumination light source section has three point light sources for emitting illumination light components of mutually different wavelengths (red, green, and blue). The point light source for emitting the blue illumination light component of the shortest wavelength is located at the position B(0,0) on the optical axis of an illumination optical system, the point light source for emitting the red illumination light component at the position R(xr,0), and the point light source for emitting the green illumination light component at the position G(xg,0). The mask is provided with an aperture in an area in which zero-order diffracted waves of respective reproduced light components of the three wavelengths are superimposed on each other after wavefront transformation by the lens. For implementing it, the illumination optical system sets incident directions of the respective illumination light components of the three wavelengths to the spatial light modulator. <IMAGE>
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