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Speckle suppression in projection displays by using a motionless changing diffuser.

Vladimir Kartashov1, Muhammad Nadeem Akram

  • 1poLight AS, N-3192 Horten, Norway. vladimir@polight.com

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|December 2, 2010
PubMed
Summary
This summary is machine-generated.

Speckle contrast in laser projection displays is improved by imaging a changing diffuser. This study generalizes speckle contrast expressions for partly correlated patterns, enhancing projection display technology.

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Area of Science:

  • Optics and Photonics
  • Display Technology

Background:

  • Laser projection displays suffer from speckle noise, degrading image quality.
  • Existing speckle suppression methods assume statistically independent diffuser patterns.

Purpose of the Study:

  • To generalize theoretical speckle contrast expressions for partly correlated speckle patterns.
  • To present a novel motionless changing diffuser structure for laser projection displays.

Main Methods:

  • Theoretical analysis of speckle contrast for partly correlated speckle patterns.
  • Development of a motionless changing diffuser incorporating a dynamic diffractive optical element (DDOE) and a light homogenizer.

Main Results:

  • Generalized speckle contrast expressions accounting for partial correlation in speckle patterns.
  • Demonstration of a DDOE based on an electrically controlled spatial light modulator (SLM) with a deformable polymer layer.

Conclusions:

  • The generalized theory accurately describes speckle contrast with partly correlated patterns.
  • The proposed diffuser structure, utilizing a high-power-handling SLM, is suitable for laser projection systems.