Head-mounted display
[2] A 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.
In 1962, Hughes Aircraft Company revealed the Electrocular, a compact CRT (7" long), head-mounted monocular display that reflected a TV signal in to transparent eyepiece.
These are usually fully integrated with the pilot's flying helmet and may include protective visors, night vision devices, and displays of other symbology.
Military, police, and firefighters use HMDs to display tactical information such as maps or thermal imaging data while viewing a real scene.
[8] In 2005, the Liteye HMD was introduced for ground combat troops as a rugged, waterproof lightweight display that clips into a standard U.S. PVS-14 military helmet mount.
The self-contained color monocular organic light-emitting diode (OLED) display replaces the NVG tube and connects to a mobile computing device.
The design is optimized to provide high definition data under all lighting conditions, in covered or see-through modes of operation.
Vuzix is currently working on a system for PCAS that will use holographic waveguides to produce see-through augmented reality glasses that are only a few millimeters thick.
By enabling engineers to interact with their designs in full life-size scale, products can be validated for issues that may not have been visible until physical prototyping.
People without brain injury are able to track the moving object with smooth pursuit eye movements and correct trajectory.
As a result of the glasses ability to block out ambient light, filmmakers and photographers are able to see clearer presentations of their live images.
The headset is produced by a collaboration between Valve and HTC, with its defining feature being precision room-scale tracking, and high-precision motion controllers.
[17] Windows Mixed Reality is a platform developed by Microsoft which includes a wide range of headsets produced by HP, Samsung, and others and is capable of playing most HTC Vive games.
These devices typically feature a relatively narrow field of view (FOV) of 50–60°, making them less immersive than virtual-reality headsets, but they offer correspondingly higher resolution in terms of pixels per degree.
[26][27] Analog FPV goggles (such as the ones produced by Fat Shark) are commonly used for drone racing as they offer the lowest video latency.
[30] A key application for HMDs is training and simulation, allowing to virtually place a trainee in a situation that is either too expensive or too dangerous to replicate in real-life.
However, a number of unwanted symptoms have been caused by prolonged use of certain types of head-mounted displays, and these issues must be resolved before optimal training and simulation is feasible.
Many 3D broadcasts, such as ESPN, chose to provide side-by-side 3D which saves the need to allocate extra transmission bandwidth and is more suitable to fast-paced sports action relative to time-based multiplexing methods.
