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The history of display technology can be broadly categorized into three primary phases, each marked by significant advancements and innovations. The journey began with monochrome vector CRTs, transitioned through monochrome raster CRTs to color raster CRTs, and eventually evolved to utilize color raster LCDs and OLEDs. CRTs, or Cathode Ray Tubes, can be classified into two main types: vector and raster. Vector CRTs, also known as random scan or electrostatic CRTs, were first employed in computer systems from the 1940s to the late 1980s. These displays were eventually replaced by electromagnetic deflection raster-scan displays, often referred to as all points addressable (APA) displays. Vector displays were typically round and large, measuring between 20 and 24 inches in diameter. In contrast, raster displays, which were based on TV CRTs, were square or rectangular in shape and ranged in size from 9 to 27 inches. Over time, advancements in technology led to the development of larger raster-scan LCD computer monitors, including 30-inch displays in the 2000s, which eventually grew to 43 inches with 6K resolution. Interestingly, the type of display used in old computers can often be identified by its shape. A notable class of vector display, known as the storage tube, was developed in 1968. The Direct-View Storage Tube (DVST) emerged as a graphics screen that could maintain an image without requiring constant refreshing, although any changes to the image required a complete redraw of the entire screen. Vector graphics terminals, which evolved from oscilloscopes, required constant refreshing of the image, making storage tube display terminals highly popular due to their ability to retain images without continuous refresh. In recent years, display technology has continued to advance, with companies like Dell introducing high-resolution monitors, such as the 49-inch 8K monitor launched in 2023. This ongoing evolution of display technology has enabled the creation of increasingly sophisticated and high-quality visual experiences (Fig. 7.1). The first production color picture tube was a 15-inch round screen CRT, made in 1954 by RCA. Raster-scan displays for graphics were initially limited to X-Y resolutions such as 256 × 256, 512 × 512, or 480 × 640 due to the cost of the memory in the frame buffer, and they were slow due to the difficulty of the processing required for scan conversion. IBM developed display standards for the PC, which can still be used today (in the form of the venerable VGA standard). Today, it is an alphabet soup with standards such as DVI, HDMI, DP, and others. Projectors have become small and low cost, making large displays possible using multiple projectors. Modern technologies like nano-crystals called quantum dots will probably be the final surface display technology until holographic displays become practical. Large public exhibition displays made with millions of small LEDs have been used as replacements for green screens in studios and in the famous Sphere in Las Vegas.