| 摘要 |
<p>A projection screen is provided having a construction well-suited for effecting lateral color constancy in rear screen projection display systems. The inventive projection screen (10) comprises a rigid light-transmissive faceplate (20) and a homogenizing holographic transmission diffuser element (100) proximate said faceplate. The holographic transmission diffuser element is made such that, upon illumination of an area of said diffuser element with a light beam (116) having a wavelength of 400 nm to 70 nm, and impinging at an incident input angle of ± 0° to 30° relative to normal incidence, said holographic transmission diffuser element produces in transmission a single diffuse output lobe (115), the diffuse output lobe produced in one area of said holographic transmission diffuser element having a relative angular intensity distribution and aspect ratio substantially identical to the relative angular intensity distribution and aspect ratio of diffuse output lobes produced in substantially all other areas of said holographic transmission diffuser element.</p> |
