Holographic near-eye displays are a promising technology to provide realistic and visually comfortable imagery with improved user experience, but their coherent light sources limit the image quality and restrict the types of patterns that can be generated. A partially-coherent mode, supported by emerging fast spatial light modulators (SLMs), has potential to overcome these limitations. However, these SLMs often have a limited phase control precision, which current computer-generated holography (CGH) techniques are not equipped to handle. In this work, we present a flexible CGH framework for fast, highly-quantized SLMs. This framework is capable of incorporating a wide range of content, including 2D and 2.5D RGBD images, 3D focal stacks, and 4D light fields, and we demonstrate its effectiveness through state-of-the-art simulation and experimental results.
Holographic near-eye displays have the potential to overcome many long-standing challenges for virtual and augmented reality (VR/AR) systems; they can reproduce full 3D depth cues, improve power efficiency, enable compact display systems, and correct for optical aberrations. Despite these remarkable benefits, this technology has been held back from widespread usage due to the limited image quality achieved by traditional holographic displays, the slow algorithms for computer-generated holography (CGH), and current bulky optical setups. Here, we review recent advances in CGH that utilize artificial intelligence (AI) techniques to solve these challenges.
Holographic displays have recently shown remarkable progress in the research field. However, images reconstructed from existing display systems using phase-only spatial light modulators (SLMs) are with noticeable speckles and low contrast due to the non-trivial diffraction efficiency loss. In this work, we investigate a novel holographic display architecture that uses two phase-only SLMs to enable high-quality, contrast-enhanced dis- play experiences. Our system builds on emerging camera-in-the-loop optimization techniques that capture both diffracted and undiffracted light on the image plane with a camera and use this to update the hologram patterns on the SLMs in an iterative fashion. Our experimental results demonstrate that the proposed display architecture can deliver higher-contrast and holographic images with little speckle without the need for extra optical filtering.
Currently, commercial head-mounted displays suffer from limited accommodative states, which lead to vergenceaccommodation conflict. In this work, we newly design the architecture of head-mounted display supporting 15 focal planes over wide depth of field (20cm-optical infinity) in real time to alleviate vergence-accommodation conflict. Our system employs a low-resolution vertical scanning backlight, a display panel (e.g. liquid crystal panel), and focus-tunable lens. We demonstrate the compact prototype and verify its performance through experimental results.
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