| 摘要 |
Aspects of the invention can provide an illumination device capable of preventing or reducing a reduction in efficiency of utilization of lights emitted from the light source, and also suitable to display high-quality moving images, and a display device and a projection type display device using this illumination device. The illumination device can include a light source to emit lights, a homogeneous light guiding device for making intensity distributions of incident lights homogeneous, a reflecting device, disposed on a light incident end face side of the homogeneous light guiding device and provided with an aperture to allow the lights to come incident, for reflecting lights to an inside of the homogenous light guiding device in a region other than the aperture, a reflection variable diaphragm device, disposed on a light exiting end face side of the homogenous light guiding device, for forming a variable aperture in which an area of an aperture region varies and, in a region other than the aperture region, reflecting the lights to the inside of the homogeneous light guiding device, a light scanning device for scanning lights emitted from the reflection variable diaphragm device on a subject to be illuminated.
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