A High Efficient Waveguide Display with Space-variant Volume Holographic Gratings

We propose a high efficient waveguide display based on space-variant volume holographic gratings~(SVVHGs). The local period and the slant angle of the SVVHG vary along its tangential direction, enabling variant incident angles to satisfy the Bragg condition of the local gratings. As a result, we enlarge the FOV without using the multiplexing scheme, achieving high efficiency and large FOV at the same time. We experimentally demonstrate that the proposed display can achieve 31.9% system efficiency for broadband light source and 52.3% for coherent light source,20° FOV, as well as high brightness uniformity, making it a promising candidate for widespread applications in AR industry.