Projection optical unit and projection display

Details Projection optical unit and projection display Projection optical unit and projection display

1998-06-25

2000-08-01

Epps, Georgia

Optical: systems and elements

Lens

With field curvature shaping

349 7, 349 8, 359650, 359651, G02B 300

Patent

active

060975466

ABSTRACT:
A projection optical unit comprises a frame, a projection lens, a dichroic prism for synthesizing red image light, green image light and blue image light, and three liquid crystal display panels for red, green and blue. A lens mounting portion on which the projection lens is mounted, a prism mounting portion on which the dichroic prism is mounted, and three mounting surfaces on which the three liquid crystal display panels are respectively mounted are formed in the frame. The projection lens, the dichroic prism, and the three liquid crystal display panels are mounted on the frame. The three liquid crystal display panels are mounted through a focus adjusting mechanism comprising a belleville spring and a screw. The two liquid crystal display panels for red and blue are further subjected to CG adjustment (adjustment for matching pixels of the liquid crystal display panels for read and blue with pixels of the liquid crystal display panel for green) by an eccentric screw.

REFERENCES:
patent: 5191450 (1993-03-01), Yajima et al.
patent: 5360282 (1994-11-01), Nagengast et al.
patent: 5805244 (1998-09-01), Suh
patent: 5833360 (1998-11-01), Knox et al.

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