High-fidelity light-field holographic display via spatiotemporal spectrum expansion and speckle noise suppression

High-quality generation of light-field holograms remains challenging due to spectral aliasing, speckle noise, and the loss of high-frequency details. We propose a spatiotemporal spectrum expansion light-field holography (STE-LFH) method that improves multi-view holographic reconstruction by encoding four-dimensional light field data across multiple time frames and applying a large-aperture composite spectral filter. This approach preserves fine image structures while suppressing low-frequency interference and zero-order diffraction. Temporal phase diversity and inter-frame accumulation enable statistical speckle suppression, leading to enhanced depth-of-field continuity and improved visual uniformity. A composite filter design combining elliptical passbands, DC suppression, and spectral windowing ensures reconstruction consistency across viewpoints. Preliminary simulations and experiments confirm the method's ability to improve image clarity, suppress artifacts, and support color and multi-angle reconstructions. STE-LFH offers a promising solution for scalable, high-fidelity light-field holographic displays in immersive 3D applications.