Diffraction optical waveguide, AR glasses and vehicle-mounted head-up display equipment

The utility model provides a diffraction optical waveguide, AR glasses and a vehicle-mounted head-up display device. The diffraction optical waveguide comprises a substrate, a coupling-in grating area and a coupling-out grating area, the coupling-in grating area and the coupling-out grating area are arranged on the substrate, the refractive indexes of the coupling-in grating area and the coupling-out grating area are different, at least the coupling-out grating area is divided into a plurality of coupling-out areas in the light transmission direction, and the refractive indexes of the coupling-out areas are increased linearly or nonlinearly in the light transmission direction. According to the utility model, the problem of low transmission efficiency of a diffraction optical waveguide in the prior art is solved. 本实用新型提供了一种衍射光波导、AR眼镜和车载抬头显示设备。衍射光波导包括基底和设置在基底上的耦入光栅区和耦出光栅区，且耦入光栅区与耦出光栅区的折射率不同，至少耦出光栅区沿光线传输方向被分为多个耦出区，多个耦出区的折射率沿光线传输方向呈线性增大或非线性增大。本实用新型解决了现有技术中的衍射光波导存在传输效率低的问题。