Retinal Display:
Virtual Retinal Display (VRD), a screenless display technology allowing the image directly to be projected on to the retina. In VRD, no real image is produced. It just beams the image to our eye balls directly. The user will feel that the display is floating in the space in front of him. Retinal Scan Display and Retinal Projector are some common popular names of it. Compared to other displays, it uses narrow band color, coherent light and allows short transient light emission. The VRD was initially invented by Kazuo Yoshinaka in 1986.Later work at the Human Interface Technology Lab at University of Washington had brought out a VRD system in 1991.Now VRD is under more research.