AR displays, or augmented reality displays, are a type of technology that overlays digital information on top of the real world. This technology allows users to interact with digital content in a more natural and immersive way, enhancing their perception of the physical environment. AR displays can be found in various devices such as smartphones, smart glasses, and headsets, and are used in a wide range of applications including navigation, gaming, education, and training. Researchers in this area focus on improving the user experience, increasing the accuracy of AR content alignment, and developing new technologies to further enhance the capabilities of AR displays.