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Lightguide-type folded 4f system for computer-generated-hologram display
Applied Optics
|June 10, 2026
Summary
This study introduces a compact planar configuration for computer-generated holography (CGH) near-eye 3D displays by integrating a 4f system into a single lightguide. This innovation enables efficient spatial filtering for improved 3D imaging performance.
Area of Science:
- Optics
- Holography
- Display Technology
Background:
- Computer-generated holography (CGH) offers true 3D imaging for head-mounted displays.
- Compact architectures are limited by spatial filtering requirements in traditional 4f systems.
Purpose of the Study:
- To develop a compact planar configuration for CGH near-eye 3D displays.
- To integrate the 4f system and spatial filtering into a single lightguide.
Main Methods:
- Folding the standard 4f system into a single lightguide.
- Placing the Fourier plane on the lightguide surface for direct spatial filter attachment.
- Computing CGH phase distribution using the iterative Fourier transform algorithm.
- Evaluating astigmatism through simulation.
Main Results:
- Achieved a compact planar configuration for CGH systems.
- Demonstrated direct attachment of spatial filters on the lightguide surface.
- Simulated and measured field-of-view magnification consistent with theoretical predictions.
- Presented images with depth information, validating the display's potential.
Conclusions:
- The proposed method enables compact, planar CGH near-eye 3D displays.
- Integration of optical components simplifies system architecture.
- The technology shows strong potential for advanced 3D near-eye applications.
