Autostereoscopy

Autostereoscopy is the display of stereoscopic imagery, typically two-view stereoscopic imagery, in a way that doesn't require special glasses or headgear. Because headgear is not required, it is also called "glasses-free 3D" or "glassesless 3D".

There are two broad approaches currently used to accommodate motion parallax and wider viewing angles: eye-tracking, and multiple views so that the display does not need to sense where the viewer's eyes are located. Examples of autostereoscopic displays technology include lenticular lens, parallax barrier, and integral imaging. Volumetric and holographic displays are also autostereoscopic, as they produce a different image to each eye, although some do make a distinction between those types of displays that create a vergence-accommodation conflict and those that do not.

Autostereoscopic displays based on parallax barrier and lenticular methodologies have been known for about 100 years.

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