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Full-colour diffraction-based optical system for light-valve projection displays

: Roder, H.; Ehrke, H.-J.; Gerhard-Multhaupt, R.; Ipp, E.; Menzel, I.


Displays. Technology and applications 16 (1995), No.1, pp.27-33
ISSN: 0141-9382
Journal Article
Fraunhofer HHI ()
large screen displays; light diffraction; optical projectors; viscoelasticity; full-colour optical system; light-valve projection displays; diffraction; metallized viscoelastic control layers; active-matrix addressing; single light source; light modulators; projection lens; colour channels; design specifications; laboratory setup; dark-field; mirror bars; illumination unit; colour separation; recombination arrangement; dark-field subsystem; efficiency; optimization

In the final article of this three-part series, the optical system for a light-valve projector with metallized viscoelastic control layers and active-matrix addressing is described. The requirements of one single light source, three identical light modulators, and one projection lens for the three colour channels lead to design specifications that were implemented in a laboratory setup with closely linked dark-field and projection subsystems. Design and construction of the experimental projection system as well as its possible improvements are discussed and details of the mirror bars, the illumination unit, the colour separation and recombination arrangement, the dark-field subsystem and the projection subsystem are presented. Finally, the overall efficiency of the system and its optimization are considered.