| 摘要 |
An image display system includes a reflecting screen that has a reflecting surface (130). The reflecting surface includes micro-ridges having a plurality of reflecting ridge-surfaces wherein the reflecting ridge-surfaces constituting a Fresnel mirror whereby the reflecting ridge-surfaces reflecting parallel reflecting light beams (145) for all incident light beams projected from a light source located at a focal point (140) of the Fresnel mirror. The micro-ridges further include a plurality of darkened ridge-surfaces (130-T) with reduced reflectance for reducing ambient reflections. The micro-ridges further constitute a continuous concentric ridge having the reflecting ridge-surfaces (130-B) facing a bottom direction toward the focal point of the Fresnel mirror for disposing a light source near a bottom location of the projecting screen. |
