the type of display that google glass presents to its users is called what
head-up display optical head-mounted display Prism projector
title: Google Glass text: Google Glass Google Glass is a brand of smart glasses—an optical head-mounted display designed in the shape of a pair of eyeglasses. It was developed by X (previously Google X) with the mission of producing a ubiquitous computer. Google Glass displayed information in a smartphone-like, hands-free format. Wearers communicated with the Internet via natural language voice commands. Google started selling a prototype of Google Glass to qualified "Glass Explorers" in the US on April 15, 2013, for a limited period for $1,500, before it became available to the public on May 15, 2014. It had an integral 5 megapixel still/720p title: Google Glass text: they were lighter than the average pair of sunglasses. In April 2013, the Explorer Edition was made available to Google I/O developers in the United States for $1,500. The product was publicly announced in April 2012. Sergey Brin wore a prototype of the Glass to an April 5, 2012, Foundation Fighting Blindness event in San Francisco. In May 2012, Google demonstrated for the first time how Google Glass could be used to shoot videos. Google provided four prescription frame choices for $225 and free with the purchase of any new Glass unit. Google entered in a partnership with the Italian title: Google Glass text: video camera. The headset received a great deal of criticism and legislative action due to privacy and safety concerns. On January 15, 2015, Google announced that it would stop producing the Google Glass prototype, to be continued in 2017 tentatively. In July 2017, it was announced that the Google Glass Enterprise Edition would be released. Google Glass was developed by Google X, the facility within Google devoted to technological advancements such as driverless cars. The Google Glass prototype resembled standard eyeglasses with the lens replaced by a head-up display. In mid-2011, Google engineered a prototype that weighed ; by 2013 title: Google Glass text: Other than the touchpad, Google Glass can be controlled using just "voice actions". To activate Glass, wearers tilt their heads 30° upward (which can be altered for preference) or simply tap the touchpad, and say "O.K., Glass." Once Glass is activated, wearers can say an action, such as "Take a picture", "Record a video", "Hangout with [person/Google+ circle]", "Google 'What year was Wikipedia founded?'", "Give me directions to the Eiffel Tower", and "Send a message to John" (many of these commands can be seen in a product video released in February 2013). For search results that are read back to title: Smartglasses text: to the Miami Design District for the public debut. Over 1500 people used Google Glass to experience Datuna's American flag from his "Viewpoint of Billions" series. After negative public reaction, the retail availability of Google Glass ended in January 2015, and the company moved to focus on business customers in 2017. The EyeTap's functionality and minimalist appearance have been compared to Steve Mann's EyeTap, also known as "Glass" or "Digital Eye Glass", although Google Glass is a "Generation-1 Glass" compared to EyeTap, which is a "Generation-4 Glass". According to Mann, both devices affect both privacy and secrecy by introducing a