Over the years, display technology has been growing, from simple CRT to plasma screen. But now display technology has reached a stage where images can be displayed in thin air without the aid of a screen. A technology used for displaying images in thin air is called Heliodisplay. In the Heliodisplay, a projector is focused onto a layer of mist in mid-air, resulting in a two-dimensional display that appears to float. Heliodisplay can work as a free-space touch screen when connected to a PC by a USB cable. A PC sees the Heliodisplay as a pointing device, like a mouse. With the supplied software installed, one can use a finger, pen, or another object as cursor control and navigate or interact with simple content. The mist is formed by a series of metal plates, and the original Heliodisplay could run for several hours on one liter of tap water.
Heliodisplay projects images as shown in figure 1. The basic units of heliodisplay are base unit and projection source as shown in figure 2. The projection source unit projects images onto the mid-air. The base unit produces the water vapour screen necessary to display the image. The image can be viewed from behind the base unit. The Heliodisplay is designed to be hidden (into a pedestal, table etc), so that only its projected image is visible. The display connects to a standard video source (such as DVD player or PC) and projects any images that would be viewable on a computer screen or television. No specialized hardware or software is needed to view images.
Heliodisplay can receive input from a computer, television, or even from videogame consoles, and project the image on a floating screen of air. The image can even give the appearance of a floating, holographic, 3-D image. Essentially, the device converts the imaging properties of the air so that the air is taken in, converted instantaneously, and then re-ejected out. Then projects onto that converted air. After air is drawn into the machine, it moves through a dozen metal plates and then comes out again. The system creates a dynamic, non-solid particle cloud by ejecting atomized condensate present in the surrounding air, in a controlled fashion, into an invisible particle cloud. It is electronic as well as thermodynamic. No moving parts are involved. The device works by creating a cloud of microscopic particles that make the air image-friendly. Light is forward transmitted to create visible images. Thus image is displayed as in figure 3.
he machine uses no harmful gases or liquids. Nothing is added to the air so there isn`t any harmful gas or liquid emitted from the device, and nothing needs to be refilled. Operating the device will not change a room`s environment, air quality or other conditions. If a Heliodisplay were left running for a week in a hermetically sealed room, the only change to the room`s environment would be from the electricity used to run the device.
The heliodisplay is a relatively new technology and is still being developed. Heliodisplay works as a kind of floating display and touch screen, making it possible to manipulate images projected in air with our fingers. Though it has some flaws the attention that it brings is enormous. Its various applications such as in advertising, a board room etc suggests that its future scope is very large. Several other thin air-displays are available but heliodisplay out classes them and as a result it has more market value. Though it is currently expensive and unaffordable Heliodisplay technology has a great potential. It is the future generation display where we can see images projected into mid-air without the help of a solid screen. It could be used for museum or trade-show displays or for advertisements, and would be ideal for collaborative work.
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