| 摘要 |
A system for projecting digital images of ultraviolet, visible, and infrared scenes in which two or more digital micromirror devices (DMDs) are employed to create projected images which have greater contrast and bit depth than can be achieved with comparable prior art devices. A source DMD creates an image of the digital scene which is used to illuminate a projector DMD, so that the projector DMD is illuminated to an extent proportionate to the corresponding scene brightness, thereby reducing the amount of undesired radiation which would otherwise illuminate the projected scene via scattering, diffraction, and/or spurious reflections from within the projection system. By including dichroic beam-splitters and additional projector DMDs it is possible to project multi-spectral-band images having enhanced contrast and bit depth relative to prior art digital projection systems. |
| 主权项 |
1. A DMD-based digital projection system for ultraviolet, visible, and/or infrared radiation in which enhanced contrast is achieved by using a first or source DMD, in combination with a series of lenses, to create an image of the desired scene in the plane of a second, or projection DMD which, when optically projected, creates an image of the desired scene, which image exhibits enhanced contrast and dynamic range by virtue of the selective illumination of the second DMD, which selective illumination serves to illuminate only those portions of the micromirror array which are intended to illuminate corresponding elements of the projected scene; by thus avoiding the illumination of those portions of the projection micromirror array corresponding to dark regions of the projected image, those same portions of the micromirror array are unable to contribute undesired illumination of the projected scene due to scattered, diffracted, or reflected radiation. |
