Lightfield display
A light field display is a display that can display a light field, which is light that a person can focus naturally on at a range of distances in the image. The light reaches the viewer from multiple angles at a single viewpoint.
Lightfield displays have been made in a variety of types, including microlens-based, sequential projection, and stacked LCD. An example of a sequential projection display is from CREAL.
A sequential light field display is a display that generates rays one by one, or in groups one after another, and displays to the eye in rapid succession.
A simultaneous light field display is one that displays all of the light all at once.
A light field display that is to solve most vergence-accommodation conflicts needs to display multiple views for each pupil which can theoretically be done using a high angular resolution backlight.[1]
Microlens-based
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A light field display can be made by putting a microlens array in front of a traditional flat display.[2] This can be done by taking a laptop computer and putting a microlens sheet in front of it.
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.
To manufacture microlens array-based LFDs, it is recommended to use a large panel of high PPI. The display panel size is recommended to be about 2.5 inches square, with a PPI of over 2000. This results in a recommended resolution of 5000x5000 per eye.
It is estimated that the existing display industry will generate 5000x5000 2.5 inch displays in about the year 2033 without outside influence. This is given that there has been about a 2.5x the horizontal and vertical resolution every 10 years from 2013 to 2023.
Instead of using high-PPI displays, it is also feasible to use fiber optic image conduits 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.