Speckle reduction device using two-axis resonant microstage

Yasuhiro Fujimura, Takashiro Tsukamoto, Shuji Tanaka

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper reports a speckle reduction device for a laser-type projector, in which an oscillating optical diffuser is driven by a 2-axis resonant microstage. 2-axis motion was achieved by a single PIT thin film actuator, to which drive signals at the resonant frequencies of both axes are superimposed. The maximum displacement as high as 50 pm could be observed, and thus the speckle contrast as low as 0.14 was achieved.

Original languageEnglish
Title of host publication25th International Display Workshops, IDW 2018
PublisherInternational Display Workshops
Number of pages4
ISBN (Electronic)9781510883918
Publication statusPublished - 2018 Jan 1
Event25th International Display Workshops, IDW 2018 - Nagoya, Japan
Duration: 2018 Dec 122018 Dec 14

Publication series

NameProceedings of the International Display Workshops
ISSN (Print)1883-2490


Conference25th International Display Workshops, IDW 2018


  • Laser projector
  • Moonie actuator
  • PZTtm
  • Piezoelectric device
  • Speckle dissolution device

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition
  • Human-Computer Interaction
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Radiology Nuclear Medicine and imaging


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