Editing Dynamic visual display

A '''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.

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]].

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.
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==By position==
===Head===
[[VR headset]]s.

===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.

==References==
{{Reflist}}

[[Category:Display]]