The concept of Virtual Reality dates back to 1935 when American science fiction writer Stanley G. Weinbaum released Pygmalion’s spectacles. From then, different prototypes of booths or HMD were introduced to the market. To this day the Extended Reality (XR) Industry is separated into different categories, two of them are the Virtual Reality (VR) and the Augmented Reality (AR).
The first category is the Virtual Reality products. With VR products, the user sees a complete virtual environment and cannot see or interact with reality. Most of the VR headsets are made with a two displays, displaying two images with some differences for our eyes to perceive 3D effects.
The second one is the Augmented Reality, where an artificial image is overlaid on reality.
Two approaches are currently being developed by companies in this field. One solution is to keep VR type headsets and adding a camera to film reality. The other approach is to use regular glasses, onto which an image will be added on one of the lenses. This image can be added by using micro displays or hologram projection.