Display Technology and Image

Topics: Display technology, Volumetric display, Display device Pages: 12 (2944 words) Published: October 31, 2011


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. Heliodisplay is a technology developed by Chad Dyner, CEO for IO2 Technologies. 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. This is similar in principle to the cinematic technique ofrear projection. As dark areas of the image may appear invisible, the image may be more realistic than on a projection screen, although it is still not volumetric. Looking directly at the display, one would also be looking into the projector's light source. Heliodisplay can work as a free-space touchscreen 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 2.1. The basic units of heliodisplay are base unit and projection source as shown in figure 2.2. 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. The Heliodisplay’s projected image hovers just above the base unit. The display is less bold than a normal computer screen. The housing of the Heliodisplay is floor bound and water particles rise rather than descend.

Figure 2.1. Heliodisplay projecting image



Figure 2.2. Basic units of heliodisplay

Heliodisplay can receive input from a computer, television, or even from video game 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 2.3.

Figure 2.3. Working



The 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 ambient air is bottom-projected and illuminated, generating the free-space image that floats in midair. It causes no odour in the air, and the area onto which the...
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