Projection type display device

Details Projection type display device Projection type display device

1992-11-25

1995-03-21

Ben, Loha

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

348757, G02B 2714

Patent

active

054001803

ABSTRACT:
A projection type display device comprising a condensing lens and a total reflection mirror disposed downstream of a single light source, a pair of crossing dichroic mirrors disposed along the path of the light reflected from the total reflection mirror and adapted to achieve both the color separation and the color combination, image displays disposed respective paths of separated R, G and B color beams, and field lenses each disposed between each of the image display and the corresponding dichroic mirror and adapted to reverse the paths of R, g and B color beams. The beam combined by the dichroic mirrors and carrying R, G and B color images is transmitted through a central aperture of the total reflection mirror to a projection lens and then enlarged at the projection lens to be projected onto a screen. The display device is capable of achieving both the color separation and the color combination by using inexpensive dichroic mirrors in place of expensive dichroic prism and color filters.

REFERENCES:
patent: 4687301 (1987-08-01), Ledebuhr

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