Maxwellian-view near-eye display with switchable viewpoints based on liquid crystal beam steering devices

Area of Science:

• Optics and Photonics
• Augmented Reality Displays
• Display Technology

Background:

• Maxwellian-view near-eye displays offer an always-in-focus image, mitigating vergence-accommodation conflict.
• A significant limitation of Maxwellian displays is their narrow eyebox, restricting user interaction.
• Expanding the eyebox is crucial for practical augmented reality (AR) applications.

Purpose of the Study:

• To propose and validate a novel Maxwellian AR display architecture with an expanded eyebox.
• To overcome the inherent eyebox limitations of traditional Maxwellian displays.
• To demonstrate an effective solution for improved AR viewing comfort and usability.

Main Methods:

• Development of a non-mechanical liquid crystal beam steering module.
• Utilizing cascaded stages of electrically switchable half-wave plates and Pancharatnam-Berry deflectors.
• Construction and experimental validation of a proof-of-concept prototype.

Main Results:

• The proposed system maintains an always-in-focus image.
• Achieved 4x4 switchable viewpoints, significantly expanding the eyebox.
• Successfully enlarged the eyebox from 3mm x 3mm to 12mm x 12mm.

Conclusions:

• The novel architecture effectively expands the eyebox in Maxwellian AR displays.
• Liquid crystal beam steering offers a viable non-mechanical solution for AR display enhancement.
• This advancement holds promise for more immersive and user-friendly AR experiences.