Head-mounted display

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Head-mounted display or HMD is a device worn over your head. It features a display in front of one or both of your eyes. The display streams data, images and other information in front of the wearer's eye(s). Certain HMDs such as Oculus Rift or HTC Vive have displays over both of their users' eyes. Others like Google Glass only have a display over one of the users' eyes.

The majority of Virtual Reality (VR) and Augmented Reality (AR) devices are head-mounted displays. In AR, the display is usually transparent and digital information is superimposed onto real life objects. These HMDs are called Optical head-mounted displays or OHMDs. In VR, the display is not transparent and only virtual information and images are displayed in front of wearer's eyes.

Virtual Reality HMDs

Large Field of View

VR HMDs have displays with large field of view that covers the entirety of the user's vision. Humans have about 120 degrees of binocular vision[1], the display of a VR device should comprise the entire vision range. A large FoV is important to create immersion for the wearer.

Stereoscopic 3D Images

Rotational Tracking

Positional Tracking

Augmented Reality HMDs

Main article: Optical head-mounted display

Augmented Reality HMDs also known as Optical head-mounted displays or OHMDs. The displays of these devices are transparent. They allow users to see through the displays while projecting images and information in front of the users' eyes.

References

  1. http://www.artinarch.com/vp05.html