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A display can also be called a visual display, a dynamic visual display, or an electronic visual display.

A display can also be called a visual display, a dynamic visual display, or an electronic visual display.

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 devices from [[Vuzix]].

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.

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.

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 devices are based on [[ray]]s. These include [[heads up display]]s in cars.

Ray based gadgets are based on [[ray]]s. These include [[heads up display]]s in cars.

==By position==

==By position==

==By representation==

==By representation==

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.

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===

===Point based===

===Ray based===

===Ray based===

===Interference pattern based===

===Interference pattern based===

Interference based devices are also called holographic devices. 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.

==References==

==References==