Delivering an immersive visual experience is the ultimate goal of near-eye displays. However, current devices face a fundamental dilemma. On one hand, near-eye displays based on binocular parallax suffer from vergence-accommodation conflict (VAC), which can cause severe visual fatigue and dizziness. On the other hand, while holographic and light-field displays provide true VAC-free 3D viewing, their field of view (FOV) are intrinsically limited by diffraction and aberrations, keeping them far from offering fully immersive experiences.
Near-eye light-field displays are widely recognized for their true 3D capabilities, lightweight form factor, full-color support, and compatibility with commercial microdisplays. Yet, traditional microlens array architectures introduce severe off-axis aberrations, so image quality deteriorates rapidly as the FOV increases. Due to the strict volume constraints of near-eye devices and the limitations of microlens fabrication, conventional geometric aberration optimization techniques—such as multi-lens groups or freeform surfaces—are generally impractical. Furthermore, the combination of high-resolution microdisplays and wide FOV requires a large optical etendue, which demands centimeter-scale light-modulating devices. This presents a significant challenge for micro- and nano-optical technologies, such as metasurfaces. Consequently, achieving both a wide FOV and true 3D visualization on a single, lightweight optical element remains a critical bottleneck in near-eye display technology.
In a new paper published in Light: Science & Applications , a team of scientists, led by Professor Jian-Wen Dong and Associate Professor Zong Qin from Sun Yat-sen University, China, and co-workers have reported a light-field near-eye display architecture based on a heterogeneous metalens array. By combining a "lens + prism" heterogeneous phase design with nanoimprint fabrication, the system overcomes the FOV limitation of conventional microlens arrays. The team experimentally demonstrated a 50° FOV 3D display — about four times that of conventional designs — and showed by simulation that the architecture can be extended to 86°, covering the human stereoscopic visual limit of approximately 80°.
The team departed from the conventional "homogeneous" microlens array approach, in which all lens units share an identical structure even though they are required to handle different imaging tasks. In a homogeneous array, the central lens is responsible for the central FOV (near-axis imaging), while peripheral lenses must handle the peripheral FOV via large-angle off-axis imaging. However, a standard lens only provides good imaging quality for near-axis light beams; once the off-axis angle becomes too large, severe aberrations lead to heavily blurred images. Since a single standard lens cannot serve all field angles well, the researchers customized every sub-lens in the array so that each one is responsible only for its corresponding FOV region. In the heterogeneous metalens array, the team superimposed a focusing phase (convex lens) and a deflection phase (prism) on each sub-lens, which is equivalent to attaching a dedicated micro-prism that redirects light. In this way, a complex off-axis imaging correction problem is smartly decomposed into two simpler tasks: near-axis imaging and linear deflection. Because every angle is matched with a corresponding customized lens, the imaging quality of the heterogeneous array remains consistently close to the diffraction limit across a large FOV.
To turn this design into a practical display module, the team also advanced both fabrication and rendering. Using low-cost, large-area nanoimprint together with a high-refractive-index resist, they produced centimeter-scale metalens arrays with a 7:1 aspect ratio, substantially lowering the barrier to mass production. Because the heterogeneous array breaks the linear geometric projection relation assumed by conventional light-field rendering, the team also developed a dedicated real-time distortion correction algorithm based on a voxel-to-pixel nonlinear mapping look-up table. The algorithm corrects the display distortion introduced by the heterogeneous array during a preprocessing step and runs at 140 frames per second on a standard laptop with integrated graphics, meeting real-time rendering requirements.
Using the module, the team built a see-through light-field near-eye display prototype. Compared with the 13° FOV of conventional light-field displays, the heterogeneous metalens system reaches a 50° FOV, expanding the FOV by about fourfold while keeping the digital content clear and complete. The prototype also preserves natural monocular 3D depth cues to alleviate visual fatigue. It demonstrates physically accurate focus and defocus behaviors, achieving a continuous 60 cm 3D reconstruction range (from 10 cm to 70 cm).
In summary, this breakthrough by the Sun Yat-sen University team successfully achieves a VAC-free 3D experience and a wide field of view on a single, ultrathin planar optical element. Furthermore, the architecture is highly scalable. Simulations indicate that with a larger micro-display, the FOV can be extended to 86°, fully covering the human stereoscopic vision limit of about 80°. This breakthrough opens a new hardware path for next-generation AI glasses, outdoor navigation wearables, and other immersive extended-reality devices.
Light: Science & Applications
Expanded field of view light-field extended-reality displays with metalens array