| 摘要 |
An illuminating optical system includes a light source that produces a light beam generally parallel to its optical axis toward a pair of fly-eye lenses in optical series for mixing light in the light beam in order to provide more uniform illumination. A condensing optical system converges and deflects the light from the fly-eye lens at an angle to a generally planar reflective display device, such as a liquid crystal display device. The fly-eye lenses and the reflective display device are parallel or nearly parallel to one another. The fly-eye lenses may be centered on the optical axis of the light source, and the optical axis of the light source may be parallel, or nearly parallel, to the direction that light from the reflective display device is reflected. A projection display device may include a projection lens that focuses the light from the reflective display device onto a screen.
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