Projecting device for displaying electronic images

摘要

A projecting device (40) for displaying electronic images and including light separating means for separating red, green and blue light beams and modulation units (44, 46, 48) for separately modulating these different light beams employs polarized light beams the polarization of which is changed in the polarization units. The light separating means are comprised in an optic module (50) including first and second polarization beam splitter mirrors (70, 74) and a first dichromatic mirror (72). A second dichromatic mirror (76) in advance of the optic module (50) separates a polarized trichromatic light beam into a polarized monochromatic beam and a polarized bichromatic beam. The polarization of one of the monochromatic beams within the bichromatic beam is then converted into another polarization thus to obtain three differently polarized monochromatic beams for modulation. The light separation thus can be achieved without different traveling distances.