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Speckle reduction using orthogonal arrays in laser projectors.
Zhaomin Tong1, Muhammad Nadeem Akram, Xuyuan Chen
1Institute for Microsystems Technology, Vestfold University College, Tonsberg N-3103, Norway.
Applied Optics
|November 25, 2010
Summary
We introduce a flexible binary phase diffuser using orthogonal arrays (OA) for speckle reduction in laser projection displays. This method achieves minimal speckle contrast ratio and offers easy electronic implementation.
Area of Science:
- Optics and Photonics
- Digital Image Processing
Background:
- Speckle noise degrades image quality in laser projection displays.
- Existing methods for speckle reduction have limitations in flexibility.
Purpose of the Study:
- To propose a novel binary phase diffuser for speckle reduction.
- To enhance flexibility and ease of implementation in laser projectors.
Main Methods:
- Utilizing a two-level orthogonal array (OA) to generate a binary phase diffuser.
- Calculating speckle contrast ratio (CR) at an intermediate image plane.
- Employing Kronecker algebra to simplify the diffuser to one-dimensional components.
Main Results:
- The OA-generated diffuser offers greater flexibility compared to Hadamard matrices.
- Optimal diffuser patterns achieve a minimum speckle CR.
- The 2D diffuser can be effectively replaced by two 1D diffusers.
Conclusions:
- The proposed OA-based binary phase diffuser effectively reduces speckle in laser projection.
- The design is more flexible and easier to implement electronically than prior methods.
