| 摘要 |
A video projection system (10) for color projection which provides a laterally displaced positioning of the projected image or picture on a screen (11). Light of several colors, e.g. generated by arrays of laser diodes (2), passes through a picture-transmitting element (1) and a projection objective (7). The picture-transmitting element (1) is preferably an LCD of the PDLCD-type. Lateral positioning of the picture is achieved either with the aid of microprisms, off-axis microlenses and/or diffractive optical elements (DOE) (71) on the exit side of the picture-transmitting element (1), or by using an off-axis illuminating optic in the form of ellipsoidal mirrors, off-axis Fresnel-lenses (31) or DOE (21) on the entrance side of the picture-transmitting elements. |
