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Waveguide-type see-through dual focus near-eye display with a polarization grating
Optics Express
|November 23, 2021
Summary
This study introduces a novel waveguide display with two image planes to reduce eye strain. The new design uses a polarization grating to create virtual images at different distances, overcoming vergence-accommodation conflict in near-eye displays.
Area of Science:
- Optics
- Display Technology
- Human-Computer Interaction
Background:
- Waveguide-type near-eye displays offer compact, lightweight, and see-through capabilities.
- Conventional systems suffer from vergence-accommodation conflict, causing eye fatigue due to a single fixed image plane.
Purpose of the Study:
- To propose and demonstrate a waveguide-type near-eye display capable of presenting two distinct image planes.
- To mitigate eye fatigue by resolving the vergence-accommodation conflict in near-eye display systems.
Main Methods:
- Implementation of a polarization grating within the waveguide structure.
- Utilizing two pairs of holographic optical elements to manage light propagation.
- Leveraging different total internal reflection angles for orthogonally polarized light beams.
Main Results:
- Successful formation of two virtual images at different focal distances within a single waveguide.
- Demonstration of high transparency for the real scene, preserving see-through capability.
- Experimental validation of the dual image plane formation principle.
Conclusions:
- The proposed dual image plane waveguide display effectively addresses the vergence-accommodation conflict.
- This technology offers a promising solution for reducing eye fatigue in near-eye display applications.
- The system maintains high optical see-through performance, crucial for augmented reality applications.
