Abstract
Speckle and the compound speckle can be reduced by angle diversity.
In laser projection displays, simple, low cost and efficient speckle reduction
techniques require smart optical design.
Using a MEMS scanner together with a condenser lens, laser beams with different
illumination angles are obtained on the diffuser surface with low speckle
contrast ratio (CR). After homogenizing within a rod integrator, the speckle
field illuminates a display panel,
and is projected onto the screen which forms the compound speckle. Characterization
method to evaluate the compound speckle reduction efficiency is analyzed and
discussed in a simplified optical system. The preliminary speckle reduction
is demonstrated in a commercial projector where a 600 mW green laser has been
used as the illumination source, and the compound speckle CR is brought down
from 0.38 to 0.14.
© 2012 IEEE
PDF Article
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