Optical displays refer to visual display systems that use light to create images or text. This includes technologies such as LED displays, LCD screens, projectors, and virtual reality headsets. Optical displays are used in a wide range of applications, from television screens and computer monitors to advertising billboards and immersive gaming experiences. Researchers in this area focus on improving the resolution, brightness, energy efficiency, and overall performance of optical display technologies. They also explore innovative display techniques such as holographic displays and flexible displays.