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Optica Publishing Group
  • Journal of Display Technology
  • Vol. 5,
  • Issue 11,
  • pp. 414-417
  • (2009)

Speckle Noise Evaluation and Reduction of an Edge-Lit Backlight System Utilizing Laser Diodes and an Optical Fiber

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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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