Abstract
Laser diodes allow one to build a very thin, wide-gamut edge-lit backlight
system for a direct-view liquid crystal display. An optical fiber is used to
transfer its optical power into a light-guide. An ultrasound transmitter
attached to the optical fiber is effective for reducing Speckle noise
because the mechanical vibration introduced averages out the random
interference patterns. In experiment, we built a backlight system with a
green laser and evaluated Speckle noise by taking photographs under the
conditions that mimicked human observation. The Speckle contrast intrinsic
to the laser was reduced from 17% to 2% by turning on the ultrasound
transmitter.
© 2009 IEEE
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