This is sometimes referred to as augmented reality (AR) or mixed reality (MR). Some HMDs can allow a CGI to be superimposed on real-world view. Most HMDs can display only a computer-generated image, sometimes referred to as virtual image. HMDs differ in whether they can display only computer-generated imagery (CGI), or only live imagery from the physical world, or combination. Some vendors employ multiple micro-displays to increase total resolution and field of view. The display units are miniaturized and may include cathode ray tubes (CRT), liquid-crystal displays (LCDs), liquid crystal on silicon (LCos), or organic light-emitting diodes (OLED). An eye tracking HMD with LED illuminators and cameras to measure eye movementsĪ typical HMD has one or two small displays, with lenses and semi-transparent mirrors embedded in eyeglasses (also termed data glasses), a visor, or a helmet.
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