| 摘要 |
In an illumination optical system whose optical axis is inclined with respect to the normal of a liquid crystal display panel 23, the form of each lens element constituting each of flyeyes (integrator plates) 11A, 11B of an integrator section 11 is adjusted in a direction along which extends a line of intersection formed between each of the flyeyes 11A, 11B and a plane including the optical axis of the integrator section 11 and the normal of the liquid crystal display panel 23, such that, when a luminous flux is obliquely incident on the liquid crystal display panel 23, its illumination area on the liquid crystal display panel 23 has a size larger than the effective area of the liquid crystal display panel 23 by a slight margin, whereby illumination efficiency is prevented from decreasing on the liquid crystal display panel 23.
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