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2024-04-15T20:00:09Z

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[[File:Soldier_Using_Virtual_Reality_Headset_MOD_45158483.jpg|thumb|Soldier Using Virtual Reality Headset MOD 45158483]] [[File:EYE-SYNC_eye-tracking_analyzer.JPG|left|thumb|EYE-SYNC eye-tracking analyzer]] [[File:U.S._Air_Force_Senior_Airman_Dieri_Dieujuste,_an_aircrew_flight_equipment_technician_with_the_74th_Expeditionary_Fighter_Squadron,_tests_a_Scorpion_helmet_mounted_integrated_targeting_system_at_Bagram_Airfield_130429-F-ZX232-013.jpg|thumb|U.S. Air Force Senior Airman Dieri Dieujuste, an aircrew flight equipment technician with the 74th Expeditionary Fighter Squadron, tests a Scorpion helmet mounted integrated targeting system at Bagram Airfield 130429-F-ZX232-013]] [[File:REN_6515.jpg|thumb|REN 6515]] [[File:Frame_sequential_3D.jpg|thumb|Frame sequential 3D]] '''Head-mounted display''' (HMD) is a type of [[display device]], worn on the head or as part of a [[helmet]], that has a small [[display optic]] in front of one ([[monocular HMD]]) or each eye ([[binocular HMD]]). A typical HMD has either one display to cover both eyes or two displays with one for each eye. These displays are usually supported by a head strap or mounted on a helmet. HMDs are used in various applications including [[virtual reality]] (VR), [[augmented reality]] (AR), [[military]], [[aviation]], and [[engineering]] to visualize data or environments, simulate experiences, or provide training.

==History==
The concept of the head-mounted display dates back to the 1960s, with early versions being developed for military aviation and training purposes. One of the first recognized HMDs was created by [[Ivan Sutherland]] in 1968, known as the "Sword of Damocles." It was a primitive VR headset, which was so heavy that it had to be suspended from the ceiling. The development of HMD technology has significantly advanced over the years, with modern HMDs being lightweight, offering high-resolution displays, and incorporating motion tracking sensors, audio output, and sometimes even eye tracking.

==Technology==
Modern HMDs consist of several key components:
* '''Display Technology:''' Most HMDs use either [[Liquid Crystal Display]] (LCD) or [[Organic Light-Emitting Diode]] (OLED) panels to display images. OLED displays are preferred for their faster refresh rates and deeper blacks.
* '''Optics:''' Lenses are used to focus and reshape the image for each eye, creating a stereoscopic 3D image by presenting slightly different angles to each eye.
* '''Tracking Systems:''' To provide an immersive experience, HMDs incorporate tracking systems that monitor the user's head movements. This can include [[gyroscope]]s, [[accelerometer]]s, and [[magnetometer]]s, or external sensors that track specific markers on the HMD.
* '''Input Systems:''' Some HMDs include built-in microphones, cameras, or other sensors to allow for voice commands, hand tracking, or eye tracking as input methods.

==Applications==
HMDs have a wide range of applications:
* '''[[Virtual Reality]]:''' Used in gaming, simulations, and training, providing an immersive experience by simulating a user's physical presence in a virtual or imaginary environment.
* '''[[Augmented Reality]]:''' Overlaying digital content onto the real world, used in various fields such as medicine, manufacturing, and repair tasks, enhancing the user's perception of reality.
* '''[[Military]]:''' For advanced navigation, situational awareness, and simulation training.
* '''[[Medicine]]:''' In surgical procedures or training, allowing for the overlay of vital information or imaging directly into the surgeon's field of view.
* '''[[Engineering]] and Design:''' Enabling designers to visualize and interact with 3D models in a real-world context.

==Challenges and Future Directions==
While HMD technology has advanced significantly, there are still challenges to overcome, including reducing the size and weight, improving battery life, enhancing display resolution, and minimizing latency. Future developments are likely to focus on improving the user experience through better ergonomics, higher-quality displays, and more accurate tracking technologies. The integration of AI and machine learning could also offer personalized experiences and more intuitive user interfaces.

[[Category:Display technology]]
[[Category:Virtual reality]]
[[Category:Augmented reality]]
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Head-mounted display - Revision history

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