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Compact Holographic Projection Display Using Liquid-Crystal-on-Silicon Spatial Light Modulator
Wei-Feng Hsu1, Ming-Hong Weng2
1Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan. whsu@ntut.edu.tw.
Materials (Basel, Switzerland)
|August 5, 2017
Summary
This study introduces a novel holographic projection display using a phase-only spatial light modulator (SLM) for beam shaping, image display, and speckle reduction, enabling compact micro-projector designs.
Area of Science:
- Optics and Photonics
- Display Technology
- Holography
Background:
- Holographic projection displays offer high-resolution imaging.
- Spatial light modulators (SLMs) are key components in holographic systems.
- Speckle noise is a significant challenge in holographic displays.
Purpose of the Study:
- To develop a compact holographic projection display.
- To integrate multiple functions (beam shaping, image display, speckle reduction) onto a single SLM.
- To improve image quality by reducing speckle contrast.
Main Methods:
- Utilizing a phase-only spatial light modulator (SLM) divided into four sub-windows.
- Calculating diffractive phase elements (DPEs) with a modified iterative Fourier transform algorithm (IFTA).
- Implementing temporal integration of eight speckled images for speckle reduction.
Main Results:
- Achieved a speckle contrast ratio of 0.39 through temporal integration.
- Demonstrated simultaneous beam shaping and image display using sub-window DPEs.
- Proposed a system extendable to full-color projection via temporal addition.
Conclusions:
- The developed holographic display integrates multiple functions onto a single SLM.
- The system's compact design, using minimal components, is suitable for micro-projectors.
- The method effectively reduces speckle noise, enhancing display quality.
