Modulation system for projection display

Details Modulation system for projection display Modulation system for projection display

1989-06-07

1991-10-22

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 61, 353 34, 359 41, H04N 930

Patent

active

050600583

ABSTRACT:
In a liquid crystal projection t.v. system the color gradient over the projected image, which is due to angular sensitivity of the dichroic mirrors, is minimized by introducing a field lens (61,62,63) next to the light values or LC-panels (21, 22, 23) in the light paths of the blue (b.sub.B), green (b.sub.G) and red (b.sub.R) beams. By chosing different length light paths before and after the light valves and LC-panels a difference in angular sensitivity of the separation mirror (41,42) and the recombination mirrors (52,53) can be compensated for.

REFERENCES:
patent: 4191456 (1980-03-01), Hong et al.
patent: 4345258 (1982-08-01), Tasai et al.
patent: 4749259 (1988-06-01), Ledebuhr
patent: 4861142 (1989-08-01), Tanaka et al.
patent: 4864390 (1989-09-01), McKechnie et al.

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