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Pupil-Adaptive Retina Projection Augment Reality Displays With Switchable Ultra-Dense Viewpoints.

Haonan Jiang1,2, Yuechu Cheng2, Zhibo Sun2

  • 1National & Local United Engineering Laboratory of Flat Panel Display Technology, Fuzhou University, 2 Xueyuan Road, Fuzhou, Fujian, Province 350108, China.

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Summary

This study introduces a novel retina projection display (RPD) for augmented reality (AR) systems. It uses switchable ultra-dense viewpoints to eliminate image discontinuity, enhancing the visual experience.

Keywords:
augmented realitymulti‐viewpoints displayphoto‐alignment liquid crystal dammann grating (p‐LCDG)retina projection display(RPD)

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Area of Science:

  • Optics and Photonics
  • Augmented Reality Displays
  • Liquid Crystal Devices

Background:

  • Retina projection displays (RPDs) in augmented reality (AR) offer a long depth of field (DOF) to address vergence-accommodation conflict (VAC).
  • Existing fixed multi-viewpoint RPDs suffer from image overlap or discontinuity due to eye rotation and ambient light variations.

Purpose of the Study:

  • To develop an RPD AR system with switchable ultra-dense viewpoints to overcome limitations of fixed systems.
  • To eliminate image discontinuity and improve visual clarity in AR applications.

Main Methods:

  • Utilized a photo-alignment liquid crystal Dammann grating (p-LCDG) to create switchable ultra-dense viewpoints.
  • Implemented a light selector for precise control over viewpoint illumination.
  • Integrated eye tracking technology for seamless viewpoint switching.

Main Results:

  • Achieved 49 switchable viewpoints with high rotation precision (1.28°/viewpoint) over a 36 mm² range.
  • Demonstrated viewpoint spacing (0.532 mm) smaller than the minimum pupil radius (≈1 mm).
  • Effectively eliminated image missing or discontinuity through controlled viewpoint selection.

Conclusions:

  • The proposed RPD AR system with switchable ultra-dense viewpoints effectively resolves image discontinuity issues.
  • This technology enables high-performance RPDs for advanced augmented reality applications.
  • The p-LCDG based approach offers precise control and a seamless visual experience.