holographic display
A holographic display is a display technique for spatial representations based on the diffraction of coherent laser light. The technique uses holography for recording and reproducing three-dimensional objects in free space.
The holographic projection technique corresponds to the reverse process as the holographic recording technique where the holograms are created by a laser with a split beam. This simultaneously illuminates the object, exposes the film and forms the reference beam.
Holographic 3D displays, which are visible floating freely in space, are formed from volume pix els(voxels). These are three-dimensional pixels. In order for them to become visible, they require a light-reflecting projection medium. This can be a gas mixture or a milky glass pane. The projection medium serves as a projection surface and reflects the projected voxels. During projection, the light points are projected onto the projection medium in rapid succession.
True holographic representations are characterized by certain properties. They are rendered correctly in perspective and when the distance is increased, they become smaller. Smaller objects positioned in front of larger ones cover them so that objects behind them cannot be seen. Changedviewing points show the objects from different angles. If you change the viewing points, the perspective also changes. Changing the distance also changes the focus on an object point.