Editing Lightfield display

A '''lightfield display''' is an electronic visual display that can show natural 3D visuals to the viewer by showing light coming from multiple angles from the display. It generates a [[light field]]. Light field displays can be made to be near the eye or fixed in the world: Either a [[near eye lightfield display]] or a world-fixed lightfield display. The generated lightfield appears to have real physical depth, meaning that a person can focus on the images naturally at a range of distances in the perceived visual image.

The light reaches the viewer from multiple angles at a single viewpoint.

The light in a light field display must be pointed at many different angles. It can use a [[lens array]] to point the light in specific directions, or it can use a [[directional backlight]] or display that naturally emits directional rays of light.

Lens-array based light field prototypes were created by [[Doug Lanman]].

A basic display can be made by stacking two [[lenticular sheet]]s perpendicularly.

It can be connected to a computer to display dynamic light field imagery and UI.

It is a type of [[multifocal display]].
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==Resolution==
Typically, a person can resolve about 1 arcmin (~0.017°), which computes to ~0.23mm at a distance of 0.8 meters.<ref name="Fovi3D"/>

==Technology==
===Sequential===

A [[sequential light field display]] is a display that generates groups of rays at various focus distances one after another, and displays to the eye in rapid succession.

Sequential light field displays have been developed by [[Andrew Maimone]] and [[CREAL]].

===Microlens-based===
{{detail|Microlens-based light-field display}}
A light field display can be made by putting a [[microlens array]] in front of a traditional flat display.<ref name="w353">{{cite web | title= | url=https://research.nvidia.com/sites/default/files/pubs/2013-11_Near-Eye-Light-Field/NVIDIA-NELD.pdf | access-date=2024-07-09}}</ref> This can be done by taking a laptop computer and putting a microlens sheet in front of it.

A world-fixed microlens or perpendicular lenticular sheet based display requires on the order of thousands to millions of different viewpoints if not using [[head tracking]] and [[view selection]] based on where the head is.

Challenges: In an LfD, the lenslet array is a high contrast object, so the eyes tend to focus on it rather than on the virtual object that is being projected.<ref name="Fovi3D">https://web.archive.org/web/20180101203430/http://www.fovi3d.com/technology/</ref>

==Manufacturing==
A light field display must be lit. For example using high brightness LEDs. The LEDs can be a broad backlight, or they can be the individual pixels or subpixels themselves.

Instead of using high-PPI displays, it is possible to use [[fiber optic image conduit]]s to transport light from a physically larger and high resolution display in a flexible way to a head-mounted apparatus, where microlensing can take place for light field generation.

==Companies==
* [[Fovi3D]]
* [[CREAL]]

==References==
{{Reflist}}

[[Category:Display]]