page_title: Peripheral Head-Mounted Display (PHMD)
hierarchical_section_title: Peripheral Head-Mounted Display (PHMD)
caption_attribution_description: English: Do-It-Yourself Peripheral Head-Mounted Display: Optical Display, Camera, Capacitive Touchsensitive Field, Microcontroller.
context_page_description: A Peripheral Head-Mounted Display (PHMD) describes a visual display mounted to the user's head that is in the peripheral of the user's Field-of-View / Peripheral Vision. Whereby the actual position of the mounting is considered to be irrelevant as long as it does not cover the entire FOV. While a PHMD provide an additional, always-available visual output channel, it does not limit the user performing real world tasks.
  The term PHMD includes devices such as Google Glass, which are often misclassified as a Head-up display if following the original definition by NASA. While NASA defined this term over centuries of space flight research, it actually describes a display that addresses the eyes-free problem, by absolving the user from the need to angle down their head. Furthermore, it provides augmented information in the user's forward Field-of-View, which is commonly projected on a windshield. In contrast, the Head-Down Display is located at the instrument control panel. Also, a HUD is mainly used to augment additional information into reality, which is technically not feasible yet for products such as Google Glass.
context_section_description: A Peripheral Head-Mounted Display (PHMD) describes a visual display (monocular or binocular) mounted to the user's head that is in the peripheral of the user's Field-of-View (FOV) / Peripheral Vision. Whereby the actual position of the mounting (as the display technology) is considered to be irrelevant as long as it does not cover the entire FOV. While a PHMD provide an additional, always-available visual output channel, it does not limit the user performing real world tasks.
  The term PHMD includes devices such as Google Glass, which are often misclassified as a Head-up display (HUD) if following the original definition by NASA. While NASA defined this term over centuries of space flight research, it actually describes a display that addresses the eyes-free problem, by absolving the user from the need to angle down their head. Furthermore, it provides augmented information in the user's forward Field-of-View (FOV), which is commonly projected on a windshield. In contrast, the Head-Down Display (HDD) is located at the instrument control panel. Also, a HUD is mainly used to augment additional information into reality, which is technically not feasible yet for products such as Google Glass (lens focus on the display causes a blurred environment – see figure below).
  This taxonomy for head-mounted displays is based on the property of its functionality and the ability of the human eye to perceive peripheral information, instead of being technology-dependent. In this article Human Factors for visual perception are being summarized, which are important to be taken into consideration when designing visual interfaces for PHMDs.
caption: Do-It-Yourself Peripheral Head-Mounted Display: Besides the Optical Display this prototype also incorporates a Camera, Capacitive Touch Sensitive Field, Microcontroller.
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