| 20080246892 | PROJECTION SCREEN - A projection screen is provided, which includes a casing having an opening disposed at the bottom thereof. The casing at least has two shafts, two screens, two stay tubes, and two driving devices disposed therein. Each of the shafts has a screen wound thereon, each screen correspondingly has a stay tube disposed at the bottom thereof, and each driving device drives a shaft. The shafts are disposed inside the casing and a screen of one material is wound on each shaft, thus the match between the projection screen and various projectors is realized by the alternation of the screens to adapt to various projection circumstances and contents, so as to obtain a better optimal projection effect. | 10-09-2008 |
