3D displays refer to technologies that allow for the presentation of three-dimensional images or animations, creating a sense of depth and realism. These displays can be found in various applications such as entertainment, gaming, medical imaging, virtual reality, and design. They work by providing different images to each eye, creating the illusion of depth and perspective. Some common types of 3D displays include autostereoscopic displays, stereoscopic displays, holographic displays, and volumetric displays. Researchers in this area often focus on improving display resolution, reducing latency, and enhancing the overall viewing experience for users.