The paper "Waveguide-based augmented reality displays: a highlight" by Jannick P. Rolland and Jeremy Goodsell reviews the advancements and future prospects of waveguide-based augmented reality (AR) displays. AR, which emerged in the 1960s, has gained significant attention for its ability to overlay digital information onto the real world. The waveguide, a compact and user-friendly optical combiner, is widely used due to its large eybox and compact design. However, it faces challenges such as limited field of view (FOV), uniformity, efficiency, and image sharpness. The authors discuss the importance of high-brightness light engines and efficient waveguides for achieving high ambient contrast ratio (ACR) under bright conditions. They also highlight the need for advanced metrics like resolution density and frame rates to enhance image quality. Waveguide combiners are categorized into geometric and diffractive types, each with unique characteristics and applications. K-vector diagrams are used to analyze the behavior of light within these systems, providing insights into FOV, uniformity, and efficiency. The paper emphasizes the importance of comprehensive performance metrics, such as minimum efficiency maps over the FOV, to understand and compare the capabilities of different waveguide designs. Ongoing research aims to optimize waveguide components and improve system performance, making AR displays more immersive and effective in various applications.The paper "Waveguide-based augmented reality displays: a highlight" by Jannick P. Rolland and Jeremy Goodsell reviews the advancements and future prospects of waveguide-based augmented reality (AR) displays. AR, which emerged in the 1960s, has gained significant attention for its ability to overlay digital information onto the real world. The waveguide, a compact and user-friendly optical combiner, is widely used due to its large eybox and compact design. However, it faces challenges such as limited field of view (FOV), uniformity, efficiency, and image sharpness. The authors discuss the importance of high-brightness light engines and efficient waveguides for achieving high ambient contrast ratio (ACR) under bright conditions. They also highlight the need for advanced metrics like resolution density and frame rates to enhance image quality. Waveguide combiners are categorized into geometric and diffractive types, each with unique characteristics and applications. K-vector diagrams are used to analyze the behavior of light within these systems, providing insights into FOV, uniformity, and efficiency. The paper emphasizes the importance of comprehensive performance metrics, such as minimum efficiency maps over the FOV, to understand and compare the capabilities of different waveguide designs. Ongoing research aims to optimize waveguide components and improve system performance, making AR displays more immersive and effective in various applications.