| 摘要 |
<p>A projection display device for displaying electrically encoded images includes an L-type optical module, which includes first, second, and third polarization beam splitter mirrors and a first retarder film. The first and the third polarization beam splitter mirrors are aligned in a plane that is perpendicular to the second polarization beam splitter mirror. A first monochromatic polarized beam is directed to the first polarization beam splitter mirror, and a bi-chromatic polarized beam is directed to the third polarization splitter mirror. The first polarization beam splitter mirror directs the first monochromatic polarized beam to a first modulation unit, and a first modulated beam reflects from the first modulation unit to the second polarization beam splitter mirror via the first retarder film. The third polarization beam splitter mirror splits the bi-chromatic polarized beam into a second monochromatic polarized beam and a third monochromatic polarized beam according to the polarizations of the beams, and directs these beams to the second and the third modulation units, respectively. The second and the third modulated beams from the second and the third modulation units are directed to the second polarization beam splitter mirror via the first retarder film and are combined with the first modulated beam to form an output beam.</p> |
