| Virtual Retinal Display |
Article Index for Virtual |
Website Links For Virtual |
Information AboutVirtual Retinal Display |
| CATEGORIES ABOUT VIRTUAL RETINAL DISPLAY | |
| display technology | |
| multimodal interaction | |
| virtual reality | |
|
In the past similar systems have been made by projecting a defocussed image directly in front of the user's eye on a small "screen", normally in the form of large sunglasses. The user focused their eyes on the background, where the screen appeared to be floating. The disadvantage of these systems was the limited area covered by the "screen", the high weight of the small televisions used to project the display, and the fact that the image would appear focussed only if the user was focussing at a particular "depth". Limited brightness made them useful only in indoor settings as well. Only recently a number of developments have made a true VRD system practical. In particular the development of high-brightness LED s have made the displays bright enough to be used during the day, and Adaptive Optics have allowed systems to dynamically correct for irregulaties in the eye (although this is not always needed). The result is a high-resolution display with excellent Color Gamut and brightness, far better than the best television techologies. Most research into VRDs to date has been in combination with various Virtual Reality systems. In this role VRDs have the potential advantage of being much smaller than existing television-based systems. They share some of the same disadvantages however, requiring some sort of optics to send the image into the eye, typically similar to the sunglasses system used with previous technologies. It can be also used as part of a Wearable Computer system. More recently, there has been some interest in VRDs as a display system for portable devices such as Cell Phone s, PDAs and various media players. In this role the device would be placed in front of the user, perhaps on a desk, and aimed in the general direction of the eyes. The system would then detect the eye using facial scanning techniques and keep the image in place using Motion Compensation . In this role the VRD offers unique advantages, being able to replicate a full-sized monitor on a small device. REFERENCES EXTERNAL LINKS |
|
|