Method and device for the projection of a color image resulting from a modulation by optical valves

摘要

The modulation by optical valves of three beam coming from a main or auxiliary primary beam of depolarized and collimated white light is achieved by means of two secondary beams of white light that are linearly polarized and perpendicular to each other. The undesirable color components are suppressed to constitute the three constituent color beams of the color image. Through the invention, the geometrical and spectral quality of the image is independent of the main or auxiliary primary beam and the image is as powerful as the one obtained by the standard method of projection. The auxiliary image can be used as a back-up or can be adapted to night-time projection.