Pixelated Blazed Gratings for High Brightness Multiview Holographic 3D Display
Pixelated Blazed Gratings for High Brightness Multiview Holographic 3D Display
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DOI：
10.1109/lpt.2020.2971147
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发表时间：
2020-03-01
影响因子：
2.6
通讯作者：
Chen, Linsen
中科院分区：
文献类型：
--
作者：
Zhou, Feng;Hua, Jianyu;Chen, Linsen
多视图 3D 显示无需任何视觉辅助即可显示 3D 图像的奇妙信息。因此，它在教育、游戏、培训和设计等许多应用中具有巨大的潜力。在所有多视点3D显示技术中，基于衍射光学和超表面的多视点3D显示技术可以呈现超宽视场和低串扰的3D图像。然而，衍射多视点3D显示的亮度受到衍射效率的限制。此外，低制造效率和高成本限制了基于超表面的3D显示的商业化发展。在这里，我们提出了一种基于多级像素化闪耀光栅的多视图 3D 显示。视图调制器中每个闪耀光栅的周期和方向不同，以形成会聚光场。通过将视图调制器与用于光强度调制的荫罩集成，组装了 4 视图原型。 3D 胸廓模型以最小串扰的方式虚拟投影在视角内。对于4级闪耀光栅，原型的光效率显着提高至60%。
Multiview 3D display can reveal wondrous information of a 3D image without any visual aids. Therefore, it has great potential in many applications, such as education, game, training, and design. Among all the multiview 3D display techniques, the one that is based on diffractive optics and metasurface can present 3D images with ultrawide field of view and low crosstalk. However, the brightness of diffractive multiview 3D display is limited by the diffraction efficiency. Moreover, the low fabrication efficiency and high cost limit the commercial development of 3D display based on metasurface. Here we propose a multiview 3D display based on multi-level pixelated blazed gratings. The period and orientation of each blazed grating in the view modulator is different to form a converged light field. A 4-view prototype was assembled by integrating the view modulator with a shadow mask for the modulation of light intensity. A 3D thoracic cage model was virtually projected within the viewing angle with minimum crosstalk. The light efficiency of the prototype is significantly improved to 60% for 4-level blazed gratings.