Waveguides and diffraction gratings for augmented reality or virtual reality displays for reducing visible appearance of grating structures

A waveguide (7001) for a virtual reality (VR) or augmented reality (AR) device is disclosed. The waveguide (7001) comprises: an input region (7003) configured to couple light into the waveguide (7001) such that light propagates under total internal reflection (TIR) within the waveguide (7001); and an output region (7005) comprising an optical structure configured to receive the image bearing light from the input region (7003). The output region (5008) comprises: first and second regions (7011, 7013) comprising an optical structure; and a transition zone (7015) between the first and second zones (7011, 7013) for mixing between the first and second zones (7011, 7013) to reduce the visible appearance of a boundary between the first and second zones. 公开了一种用于虚拟现实VR或增强现实AR设备的波导(7001)。波导(7001)包括：输入区域(7003)，被配置成将光耦入波导(7001)中，使得光在波导(7001)内在全内反射(TIR)下传播；以及输出区域(7005)，包括光学结构，该光学结构被配置成接收来自输入区域(7003)的图像承载光。输出区域(5008)包括：第一区和第二区(7011，7013)，包括光学结构；以及第一区与第二区(7011，7013)之间的过渡区(7015)，用于在第一区与第二区(7011，7013)之间进行混合，从而减少第一区与第二区之间的边界的可