Holographic display faces the trade-off between image quality and focus cues, resulting from the specific choice of phase distribution. In this Letter, we propose a speckle-free holographic display with enhanced focus cues by multiple directional light reconstruction. The uniform phase hologram is first generated by the gradient descent optimization algorithm. The blazed grating phase is used to steer the object light to a specific direction. Multiple sub-holograms with different blazed gratings are refreshed fast to reconstruct the images from different directions. Thus, the defocus blur is improved due to the separation of multiple spots on the defocus plane. The multi-plane reconstruction is also realized by pre-processing the depth images to eliminate image separation. The proposed method provides apparent focus cues while maintaining high image qualities, which is expected to realize comfortable holographic near-eye display in the near future.

中文翻译：

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高质量全息 3D 显示，具有基于多方向光重建的增强聚焦线索

由于相位分布的具体选择，全息显示面临图像质量和聚焦线索之间的权衡。在这封信中，我们提出了一种无散斑全息显示器，通过多方向光重建增强聚焦线索。首先通过梯度下降优化算法生成均匀相位全息图。闪耀光栅相位用于将物体光引导至特定方向。具有不同闪耀光栅的多个亚全息图快速刷新，以从不同方向重建图像。因此，由于散焦平面上多个点的分离，散焦模糊得到改善。多平面重建也是通过对深度图像进行预处理以消除图像分离来实现的。该方法提供了明显的聚焦线索，同时保持了高图像质量，有望在不久的将来实现舒适的全息近眼显示。