Virtual retinal display (VRD), as explained on wisegeek.com (http://wisegeek.com/what-is-a-virtual-retinal-display.htmvirtual-retinal-display.htm) is a head mounted system which projects 
images on the
human’s retina. This system allows the user to look at a screen which will appear a few feets away, in the air, while still allowing to see the background environment. The information contained on the screen and the possibility to interact with it depends both on the purpose of the VRD and the technology advances (as for the interaction with the virtual screen). This picture has been taken from Microvision's website, a leader in new generation display and imaging products. You can find information about the company and their products as well as interesting VRD's photos and videos on their website : http://www.microvision.com/
images on thehuman’s retina. This system allows the user to look at a screen which will appear a few feets away, in the air, while still allowing to see the background environment. The information contained on the screen and the possibility to interact with it depends both on the purpose of the VRD and the technology advances (as for the interaction with the virtual screen). This picture has been taken from Microvision's website, a leader in new generation display and imaging products. You can find information about the company and their products as well as interesting VRD's photos and videos on their website : http://www.microvision.com/
In order to create these virtual displays, VRD uses 4 modules consisting of drive electronics, light sources (lasers), a scanner and a lens. To make it simple, the drive electronics will convert the 
image (or data) so that it can be sent as a laser to the scanner, which will breakdown the laser in pixels to finally create an image using the lense. In other words, VRD is different from watching a tv as the image is sent directly on the retina and, therefore, can only be seen by the user. These informations as well as further explications can be found on both the US Navy and the HIT lab of the university of washington 's websites.
To see a very interesting interactive explanation of virtual images are created through lasers and scanners visit :
image (or data) so that it can be sent as a laser to the scanner, which will breakdown the laser in pixels to finally create an image using the lense. In other words, VRD is different from watching a tv as the image is sent directly on the retina and, therefore, can only be seen by the user. These informations as well as further explications can be found on both the US Navy and the HIT lab of the university of washington 's websites.To see a very interesting interactive explanation of virtual images are created through lasers and scanners visit :
image.http://www.cs.nps.navy.mil/people/faculty/capps/iap/class1/disptech/disptech.html (java is needed)
Finally, altough VRD is still at the prototype stage, the army is already using it for different 
purposes. Helicopters pilots, for instance, have VRD's mounted in their helmets, as we can see in this photo taken from the US Navy computer science department website. These VRD's aren't ready for commercialisation, but as for most technologies, it is just a matter of time.
purposes. Helicopters pilots, for instance, have VRD's mounted in their helmets, as we can see in this photo taken from the US Navy computer science department website. These VRD's aren't ready for commercialisation, but as for most technologies, it is just a matter of time.
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