| 摘要 |
A projection optical system and a projection display device employing the projection optical system are provided. The projection optical system includes a display device displaying an image to be projected onto an image display region, and first and second optical systems sequentially disposed along an optical path from a screen to the display device. When the optical axis of the first optical system is taken as a reference axis, the image display region of the display device is disposed with parallel eccentricity to the reference axis, and the second optical system is disposed eccentrically to the reference axis. Thus, an image displayed on the image display region is enlarged and projected on a position that is eccentric with reference to the reference axis. The projection display device includes an illuminating unit radiating light for forming an image to be projected and the projection optical system,
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