Transactions of the Society of Information Storage Systems (정보저장시스템학회논문집)

The Society of Information Storage Systems (정보저장시스템학회)
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Design and Fabrication of Optical Element for Speckle Reduction in Laser Projector

레이저 프로젝터의 스페클 저감을 위한 광학 소자 설계 및 제작

  • Lee, Jae-Yong (School of Mechanical Engineering, Yonsei University) ;
  • Kim, Young-Joo (School of Mechanical Engineering, Yonsei University)
  • Received : 2014.09.18
  • Accepted : 2014.09.23
  • Published : 2014.09.25
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Abstract

Laser projector has many advantages of high brightness, high resolution and small size, but the huge drawback of image degradation called speckle which generated by coherence of laser and roughness of surface interrupts their general use. There are many methods to reduce speckle pattern, but they need effective optical systems to realize display to the far field with huge volume. We designed speckle reduction element by using microlens with controlled curvature to reduce spatial coherence. Vibration element was also applied to reduce temporal coherence which considered response time of eye. Designed element was fabricated by simple reflow method and imprinting method. From the results, the fabricated element performed 48.33% of speckle reduction efficiency and 41.29% of optical efficiency with a single doublet lens.

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References

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