In this paper, a compact waveguide eyeglass integrating freeform surfaces and volume holographic gratings (VHGs) is proposed for full-color display with high energy utilization. The in-coupler with four freeform surfaces collimates the light emitting from the micro image source (MIS) and couples them into the waveguide. The six-layer VHGs as an outcoupler are designed to modulate the light propagating toward the user’s eye. The chromatic aberrations and aberrations are well optimized and compensated by the in-coupler. The diffraction angular bandwidth of the gratings matches the angular range of the light propagating in the waveguide. The simulation results show that our proposed eyeglass achieves a diagonal field of view (FOV) of 39.5°, the average diffraction efficiency of the outcoupler achieves 95.22%, and the diffraction uniformity is about 0.95. Because of the integrated designs and compact stable structures, the optimized display system is expected to be flexibly used in various applications.

中文翻译：

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通过结合自由曲面和体积全息光栅来高效设计紧凑型波导眼镜

本文提出了一种紧凑的波导眼镜，集成了自由曲面和体全息光栅（VHGs），用于具有高能量利用率的全色显示。具有四个自由曲面的耦合器可对微图像源（MIS）发出的光进行准直，并将其耦合到波导中。六层VHG作为外耦合器，旨在调制向用户眼睛传播的光。色差和色差通过耦合器很好地优化和补偿。光栅的衍射角带宽与在波导中传播的光的角范围匹配。仿真结果表明，我们提出的眼镜对角线视野（FOV）为39.5°，外耦合器的平均衍射效率达到95.22％，并且衍射均匀度约为0。