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−It can also be called a '''dynamic visual display''' or '''electronic visual display'''.+Dynamic visual displays are typically electronic. They are typically driven by an electronic signal and output modulation of light.+Dynamic visual displays include computer screens, television screens, alarm clock displays, dynamic LED billboards, game boy displays, stereoscopic head-mounted displays, and heads-up displays in cars.+Display devices can be point based, ray based, or interference based. Point and ray based displays can be studied using [[ray optics]]. Interference based displays must be examined using [[wave optics]]. Point based devices are based on point sources. These include laptop screens, televisions, and smartphone screens.+Ray based devices are based on rays. These include heads up displays in cars.+Interference based devices are also called holographic devices. The display device modulates light that interferes with itself and forms a pattern at some distance. This is the rarest type of device.+Stereoscopic visual displays include VR headsets.+
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A '''display''' is a device that modulates light according to the state of a connected control system, such as a digital state machine or an analog electronic circuit. Common digital state machines include computers.
+A '''dynamic visual display''' is a machine that conveys images or information by sending out [[visible light]]. It is often electronic, meaning it uses electricity as the power and the signaling.
−A display can be a [[near-eye display]] fixed to the head, or a [[world-fixed display]].
−Displays work by being connected to a control system like a computer. The computer generates informational signals that the display reacts to and creates light. Displays are necessary for most modern computing.
−Displays can have their point of origin be in the world or on a user's head. A world fixed display exists in the world, like a laptop, a TV, or a smartphone. A head fixed display is mounted to the head, meaning when you turn your head it stays exactly the same in the user's field of vision. Examples of head fixed displays are [[VR headset]]s, [[Google Glass]], and headsets from [[Vuzix]].
−The most important features for a display to be useful are [[field of view]], contrast (both static and dynamic and in color), and [[focal depth]] capability.
−Common digital state machines include computers.
−Traditional computer systems typically use 2D displays, which have a fixed focal depth.
+Ray based displays use the concept of light going in straight lines, [[ray]]s. These include [[heads up display]]s in cars.
+__NOTOC__
+==By position==
+===Head===
+[[VR headset]]s.
−==Stereoscopic==
+===World===
−===Eye===
+[[AR contact lens]]
+==By representation==
+Display gadgets can be point based, ray based, or interference based. Point and ray based displays can be studied using [[ray optics]]. Interference based displays must be examined using [[wave optics]]. Point based gadgets are based on point sources. These include laptop screens, televisions, and smartphone screens.
+===Point based===
+* Most or all [[smartphone]]s
+===Ray based===
+* [[Projector]]
+===Interference pattern based===
+Interference based gadgets are also called holographic gadgets. The display gadget modulates light as in wave optics that interferes with itself and forms a pattern at some distance. This is the rarest type of device.
+===Companies===
+A company that produces display products is Stratacache. It previously had a location at 1830 Willow Creek Circle, Eugene, OR 97402, which has since gone on the market.<ref name="k843">{{cite web | title=1830 Willow Creek Cir, Eugene, OR 97402 | website=LoopNet | date=2024-11-18 | url=https://www.loopnet.com/Listing/1830-Willow-Creek-Cir-Eugene-OR/32730773/ | access-date=2024-11-24}}</ref>
+==References==
+{{Reflist}}
+[[Category:Display]]