| 摘要 |
An improved object projection system provides an observer with a surrounding background that has adjustable contrast levels relative to an object (12). A transmissive polarizer (15) and a reflective polarizer (11) change relative orientations (9 and 17). The change in orientation causes the level of light passing through the transmissive polarizer to change. In one system, the transmissive polarizer (15) is placed in front of an object (12). A light source (10) is placed in front of the object (12) and behind the transmissive polarizer (15). A reflective polarizer (11) is placed behind the object (12). The reflective polarizer (11) provides the surrounding background for the object (12). A light source (10) illuminates the object (12) and the reflective polarizer (11). The object (12) emits reflected light, which travels through the transmissive polarizer (15). Light from the reflective polarizer (11) is transmitted to the transmissive polarizer (15). The level of light transmitted depends on the orientation of a transmissive axis (17) of the transmissive polarizer (15) to a reflective axis (9) of the reflective polarizer (11). |
