Projection-type display device having light source means includi

Details Projection-type display device having light source means includi Projection-type display device having light source means includi

1991-04-09

1992-08-25

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 41, 353122, 362298, G02F 113, F21V 700

Patent

active

051423871

ABSTRACT:
The projection-type display device has a light source emitting a parallel luminous flux, a liquid crystal light valve disposed on the luminous flux and outputs a rectangular two-dimensional image to be projected on a screen, and a projection lens magnifying the rectangular two-dimensional image output. The light source has a first concave mirror (parabolic mirror) the reflective surface of which is oriented in the direction of emission of the luminous flux, a lamp laced in front of the first concave mirror, and a second concave mirror (parabolic mirror or spherical mirror), the reflective surface of which is oriented toward the first concave mirror. In the second concave mirror is formed an aperture window, which is a rectangle of substantially similar to that of the liquid crystal light valve and emits a rectangular luminous flux. The beam from the lamp is reflected by the first concave mirror, and one or more times by the second concave mirror, becoming a parallel beam oriented in the direction of the optical axis. The parallel light beam is made into a luminous flux of rectangular cross section by the rectangular aperture window. Accordingly, luminous flux is not blocked wastefully, but serves to increase the brightness of the projected image.

REFERENCES:
patent: 2198014 (1937-07-01), Ott
patent: 3796886 (1974-03-01), Freeman
patent: 4151584 (1979-04-01), Labrum
patent: 4171874 (1979-10-01), Bigelow et al.
patent: 4721366 (1988-01-01), Nosker
patent: 4735495 (1988-04-01), Henkes
patent: 4765718 (1988-08-01), Henkes
patent: 4871249 (1989-10-01), Watson

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