What Is a Hologram Projector?

Holographic projection technology (front-projected holographic display) belongs to a kind of 3D technology, which originally refers to the technology that uses the principle of interference to record and reproduce the true three-dimensional image of an object. Then, with the guidance of science fiction movies and commercial propaganda, the concept of holographic projection gradually extended to commercial activities such as stage performances and exhibitions. However, the holograms we usually know are often not holographic projections in the strict sense, but are a kind of holographic projection technology that uses 3D effects such as por phantoms and edge blanking.

Holographic projection

1947, United Kingdom

Holographic projection technology (front-projected holographic display) is also called

Holographic technology can be subdivided into optical holographic technology,

1. Holographic technology can record and reproduce all the information about the amplitude and phase of an object's light waves. Therefore, the application of holographic technology can obtain the same stereo image as the original (observing the virtual image of the hologram from different angles, you can see different sides of the object, there is an inspection effect and a sense of depth of field).

2. Any part of the hologram can reproduce the basic shape of the original object. Spherical waves scattered at any point on the object can reach each point or part of the holographic dry plate and interfere with the reference light to form a primitive hologram, which is holography Each point or part of the map records scattered light from all object points. Therefore, each part of the object hologram can reproduce all the object points irradiated to that point during recording, forming an image of the object, that is, the part of the hologram can still reproduce the image of the object after being damaged.

3. As a recorder of light wave information, the presence or absence of a hologram is an important criterion for judging whether the 3D technology we are in contact with is a holographic technology.

The currently implemented 3D technologies (not holographic) are mainly the following:

Air projection and interaction technology : A 29-year-old graduate student in science and engineering in ChadDyne, Massachusetts, invented an air projection and interaction technology. This is a milestone in display technology. It can project interactions on a wall formed by airflow. Functional images. This technology source

The concept of holography has a good mass foundation in China; seeing a display floating in the air in science fiction movies is often referred to as "holographic display"; since the mass foundation of "holographic" is so good, many businesses are promoting transparent display and 3D When displaying related technologies, a "holographic" stage name is added, such as the projection "holographic" film sold on Alibaba; such as the common pyramid "holographic" display cabinets in technology exhibition halls, and even Microsoft's HoloLens is only a binocular stereo virtual image Display, rather than "holographic" displays (although there are optical waveguides and grating components), which has led to a common misunderstanding of "holographic" perceptions in China. In fact, when we need to judge whether the "holographic" projection we see is truly holographic, we only need to know whether there is a hologram.