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Published on: March 31, 2016
Speckle reduction mechanism in laser rear projection displays using a small moving diffuser
Yuhei Kuratomi1, Kazuo Sekiya, Hiroaki Satoh
1Department of Electronics, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan. yuhei@gamma.ocn.ne.jp
Summary
This study models speckle generation and reduction in laser projection displays. Rotating a small diffuser effectively reduces speckle by controlling the granularity of laser light patterns on the screen.
Area of Science:
- Optics and Photonics
- Display Technology
Background:
- Speckle noise is a significant issue in laser rear projection displays.
- Existing speckle reduction methods often lack practical implementation or efficiency.
Purpose of the Study:
- To develop a physical model for speckle generation and reduction in laser projection systems.
- To investigate the relationship between diffuser properties and speckle reduction efficiency.
Main Methods:
- Modeling the physical process of speckle generation, moving beyond statistical analysis.
- Analyzing the impact of a small moving diffuser on coherent regions on the projection screen.
Main Results:
- Speckle pattern granularity is directly linked to the size of coherent regions.
- The efficiency of speckle reduction is determined by the diffuser's granularity and rotation speed.
Conclusions:
- A physical understanding of speckle generation is crucial for effective reduction.
- The proposed optical system with a moving diffuser offers a practical approach to enhance laser display quality.
