Near-eye lightfield display
A near-eye lightfield display is a type of light field display that is part of a head-mounted display and projects directly into the eye. It is fixed to the coordinate system of the user's head.
A near-eye lightfield display ought to be made in pairs, as one is needed for each eye to have all depth cues.
Near-eye 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 near-eye lightfield display may be paired with a computer system that automatically updates the rendering viewpoint according to positional and orientational sensor data, such as a virtual reality system or augmented reality.
There may be a human visual system response similar to the vestibulo-optical reflex in a system without positionial tracking that can be counteracted using a long focal distance for something that is displayed. This concept can be built into a software system that has an IMU attached by disabling the nearest parts of the image if the head moves, to avoid VOR discomfort.
Specifications[edit]
To manufacture near-eye 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.
90 degrees field of view or higher is recommended for a virtual reality scenario.