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A compact near-eye display with a 60° horizontal field of view, wide eye box of 5 mm, and high resolution of 720 p is proposed and developed by combining a transmission hologram that duplicates the beam of a scanning display and a reflection hologram that reflects duplicated beams toward the user's eye. The feasibility of the proposed near-eye display is demonstrated by examining the specifications and exposure of 24 multiple holograms. A compact NED that can display images with a horizontal FOV of 60° and that has a 6.2 mm × 4.8 mm eye box and 720 pixels vertical resolution is achieved.
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http://dx.doi.org/10.1364/OE.462857 | DOI Listing |
Nanoscale
August 2025
Department of Materials Science and Engineering, Seoul National University, Seoul 08826, South Korea.
Precise control over the emission direction of colloidal quantum dots (CQDs), which are promising color conversion materials for micro-light-emitting-diode displays, is increasingly important for augmented-reality and virtual-reality near-eye optics. Here, we report a fully dielectric silicon nitride (SiN) photonic crystal (PhC) platform that boosts CQD photoluminescence by an 8.5-fold increase while compressing the angular full-width at half-maximum to 6.
View Article and Find Full Text PDFWith the rapid development of near-eye display (NED) technology, it has become a key device connecting the virtual world, widely used in various industries. However, most commercial NED systems have a limitation: they provide only a fixed virtual image distance, which restricts their performance in 3D visual effects and can lead to visual issues such as vergence-accommodation conflict. To address this issue, an augmented reality NED system was designed by integrating a liquid crystal variable retarder and polarizing beam splitter prisms in combination with freeform prisms.
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February 2025
Computer-generated holography (CGH) has made significant advancements and is considered a leading approach for near-eye 3D displays. Recent learning-based CGH methods address the time-quality trade-off of traditional approaches but often face challenges related to efficiency and computational demands, especially with real-valued networks in multi-depth settings. To overcome these issues, this study proposes a residual block-based complex-valued convolutional neural network (ResC-CNN) structure, integrated into a symmetric dual-network framework driven by a diffraction model, for real-time generation of multi-depth holographic displays.
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March 2025
A full-color diffractive optical waveguide scheme is developed specifically for near-eye displays (NED) used in augmented reality (AR) applications. This configuration integrates a color filter (CF) and distributed Bragg reflector (DBR) as filters to efficiently address color dispersion issues. The CF functions to selectively filter out heterochromatic light within the waveguide, thereby guaranteeing the presence of a single, pure primary color within each waveguide.
View Article and Find Full Text PDFWe present a waveguide-based near-eye display designed to enhance immersive augmented reality experiences. Unlike conventional waveguide displays that project virtual content onto a single focal plane, the proposed waveguide optics can display images across an extended depth range. This extension of focus cues is achieved through a multifocal holographic optical element (M-HOE) that functions as an output coupler on the waveguide.
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