Modulation system for projection display
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United States of America Patent
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-
Oct 22, 1991
Grant Date -
N/A
app pub date -
Jun 7, 1989
filing date -
Jun 7, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
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