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−There are two major types of display: World fixed display and head-fixed display. 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 in front of your eyes. Head fixed displays include [[VR headset]]s and the [[Google Glass]] and gadgets from [[Vuzix]].+
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A '''display''' is an optical machine that conveys images or information by sending out [[visible light]]. It can be a [[near-eye display]] fixed to the head, or a display that is out in the world. 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.
+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.
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.
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Traditional computer systems typically use 2D displays, which have a fixed focal depth.
Traditional computer systems typically use 2D displays, which have a fixed focal depth.
−Ray based gadgets are based on [[ray]]s. These include [[heads up display]]s in cars.
+Ray based displays use the concept of light going in straight lines, [[ray]]s. These include [[heads up display]]s in cars.
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==By position==
==By position==
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===Point based===
===Point based===
+* Most or all [[smartphone]]s
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===Ray based===
===Ray based===
+* [[Projector]]
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===Interference pattern based===
===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.
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.
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+===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==
==References==