Light Field
A light field describes light not only by its brightness and color, but also by the positions and directions through which the light travels. This directional information is what allows a scene to reveal different perspectives when the observer moves.
A light field display reproduces a selected set of those directions. Instead of presenting the same image to every viewer, it emits multiple neighboring views across a viewing cone. The left and right eyes receive different views, creating stereoscopic depth, while sideways head movement selects a new view pair and produces motion parallax.
Practical displays reproduce a limited sample of a light field rather than every ray from a real scene. Their quality depends on the number of views, angular resolution, panel resolution, optical alignment, viewing cone, depth range, and crosstalk.
A light field records or displays where light travels and in which direction, not only how bright each pixel is.
Read about lenticular images and Looking Glass light field displays