Changes

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 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.

Ray based devices are based on [[ray]]s. 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.

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==

==Stereoscopic==

Stereoscopic visual displays include VR headsets.

Stereoscopic visual displays include [[VR headset]]s.