Plasma panels and LCD screens have not surprised anyone for a long time, having taken their place in everyday life. The technology of creating a stereoscopic image using 3D glasses, which has occupied its niche and is actively developing, has become familiar in recent years. Most experts are of the opinion that the next stage in the development of display technologies will be the appearance of a holographic projection screen, which is quite logical, since modern 3D television is an intermediate stage in the formation of a three-dimensional image, since a three-dimensional image on such screens is visible only at a certain position of the head. Holographic displays can be seen as the next step in the development of 3D technology.
Principle of 3D technology
Modern cinemas and TV use 3D technology, which is based on tricking the human eye by presenting slightly different images to the eyes, which ultimately creates a three-dimensional effect. Optical focus is widely used in 3D technology: for example, the illusion of depthand image volume is created using polarized glasses that filter part of the image for the left and right eyes.
Lack of 3D technology
The disadvantage of this technology is that the three-dimensional image is visible only at a certain angle. Despite the fact that home TVs with 3D effect and without glasses are on sale, the viewer can watch them only if he is exactly opposite the display. The three-dimensional image begins to disappear when slightly shifted to the right or left relative to the center of the screen, which is the main drawback of all 3D displays. Holographic screens should solve this problem in the near future.
Pseudo-holographic displays
Today, pseudo-holographic screens created on the basis of a translucent grid or film are very popular. Panels are attached to the ceiling or shop window. With proper lighting, the panels are invisible to humans, and if an image is projected onto them, it creates the impression of a hologram through which the viewer can look. In comparison with liquid crystal screens and plasma, pseudo-holographic screens have a number of advantages: a bright image, originality, and the ability to install in any room.
The projector that projects the image may be hidden from the viewer. The advantages of such equipment are wide viewing angles, high image contrast and the ability to create holographic screens of a certain size and shape. Displayson a translucent film are used to give an unusual effect and charm to the room, the design of television studios and retail spaces. Transparent panels are produced by many companies and are used for advertising and marketing purposes.
Sax3D Screens
One of the most popular are Sax3D holographic screens from a German company, created using selective light refraction technology, so that the system ignores any light in the room except for the projector beam. The display itself is made of durable transparent glass, on top of which a thin film is applied, turning the screen into a hologram and displaying the contrast image projected by the projector. Such a holographic screen allows you to view both digital images and videos. Transscreen displays work on a similar principle, made of polyester film with special layers that block light coming from the side of the projector.
Holographic TVs
People are more interested not in specialized screens, but in solutions that can be used in tablet computers, TVs and smartphones with a holographic screen. It is worth noting that in recent years a large number of original solutions have appeared in this area, despite the fact that most of them work on an improved 3D effect.
InnoVision at CES 2011 presented to the public a prototype TV with a holographic screen called HoloAdDiamond. When creating a TV, a prism is used that refracts the light coming from several projectors and creates a full-fledged hologram that the viewer can view from different angles. During the demonstration, visitors to the exhibition and journalists were able to make sure that such a hologram significantly exceeds the images created by classic 3D devices in terms of color saturation and depth.
The HoloAd TV can play FLV images, photos, and videos as a hologram. At the exhibition, the company presented two TV models based on a similar principle: the resolution of the first is 1280x1024 pixels, the weight is 95 kilograms, the resolution of the second is 640x480 pixels. Despite the fact that the TVs are quite large, they are convenient and comfortable to use.
Technology Development
HP labs in Palo Alto have attempted to fix the age-old problem with 3D screens. To reproduce a three-dimensional image visible from any point of view, the researchers proposed to show the image from different sides, sending a separate picture for each eye of the viewer. This technology involves the use of a system with laser systems and rotating mirrors, however, Californian scientists resorted to the components of a conventional liquid crystal panel, inflicting a large number of round grooves on the inner surface of the screen glass. As a result, this made it possible to refract the light in such a way as to create in front of the viewerthree-dimensional hologram. The HP-designed screen shows viewers a static 3D image from 200 points and a dynamic image from 64.
Holographic Screen Phone
Relatively recently, the event expected by many finally took place - a smartphone with a holographic display was officially presented. The display technology used in the Red Hydrogen One phone is expensive, but will be used on many mobile devices in the near future.
Red is primarily focused on the production of professional digital cinema cameras, but now it has turned its attention to a new industry with the development and introduction of the Red Hydrogen One holographic smartphone.
Phone display
Red said that the screen installed on the smartphone is a hydrogen holographic display that allows you to instantly switch between 2D content, 3D content and the holographic content of the Red Hydrogen 4-View application. Despite the fact that exact information about the principle of this technology has not been published, the smartphone allows you to view all holograms without the use of special glasses or additional accessories.
Demonstration of the Red smartphone with a holographic screen took place in June 2017, but no details have yet been disclosed by the manufacturer. However, there are a few lucky bloggerswho managed to hold two prototype smartphones in their hands: one is a non-functional mock-up showing the finish and appearance of the phone, the second is a working device, which the company still keeps under wraps.
