Apparatus and method for limiting light divergence angle and projection image display apparatus
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United States of America Patent
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Oct 15, 2002
Grant Date -
N/A
app pub date -
Apr 27, 2000
filing date -
May 18, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a light divergence angle limiting apparatus for improving color purity and displaying a high-quality image by blocking unnecessary color rays except for a predetermined color ray. A divergence angle of at least one of a plurality of color rays is limited in consideration of light emission characteristics of a light source so that color rays (for example, B and G rays) different from a predetermined color ray (for example, R ray) do not enter a pixel corresponding to the predetermined color ray by using a light blocking plate provided as a light divergence angle limiting apparatus.
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