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Multifocal waveguide-based display in augmented reality
Applied Optics
|August 12, 2025
Summary
This study introduces a new augmented reality (AR) waveguide display using a multifocal holographic optical element (M-HOE). This technology extends focus cues, potentially reducing eye strain and enhancing immersive AR experiences.
Area of Science:
- Optics
- Augmented Reality Displays
- Holographic Optical Elements
Background:
- Conventional waveguide displays in augmented reality (AR) are limited to a single focal plane.
- This limitation can cause vergence-accommodation conflict, impacting user experience and immersion in head-mounted AR systems.
Purpose of the Study:
- To develop and demonstrate a waveguide-based near-eye display capable of presenting virtual content across an extended depth range.
- To address the vergence-accommodation conflict in AR displays through advanced optical design.
Main Methods:
- Designed a waveguide display incorporating a multifocal holographic optical element (M-HOE) as an output coupler.
- Fabricated the M-HOE by integrating three distinct volume holographic gratings within a single photopolymer film, creating a trifocal miniaturized flat lens.
Main Results:
- Experimentally demonstrated that the M-HOE can project virtual content at three distinct focal distances: -300 mm, -600 mm, and -1000 mm.
- The developed waveguide optics successfully extended the depth range for virtual image focus.
Conclusions:
- The proposed M-HOE waveguide display shows promise for alleviating the vergence-accommodation conflict in AR.
- This technology has the potential to significantly enhance the immersiveness of future augmented reality experiences.
