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Light valve projector for HDTV with 1600 lm light output using a 400 W lamp

: Ehrke, H.-J.; Kuhlow, B.; Rosin, T.; Sinnig, T.; Tepe, R.; Troller, G.

Frequenz 39 (1985), No.9, pp.257-62
ISSN: 0016-1136
ISSN: 2191-6349
Journal Article
Fraunhofer HHI ()
colour television; colour television receivers; electro-optical devices; lamps; lenses; optical filters; optical projectors; television systems; HDTV; 1600 lm; light output; 400 w; lamp; light-valve system; color picture projection; finer carrier gratings; deformation behaviour; control layer; cylindric lenses; illumination; interference filter stripes; dark-filter system; electro-optic efficiency

Describes an improved light-valve system for color picture projection. An increased resolution is achieved by using finer carrier gratings regarding the deformation behaviour of the control layer. The efficiency of the light-valve is amended by applying cylindric lenses for illumination and use of interference filter stripes in the dark-filter system. In addition a new projection lamp with increased electro-optic efficiency is used. The concept for a projector with HDTV-capability is presented, whereby the total light output is 1600 lm by using a 400 W lamp.