Virtual Retinal Display VRD

[wagathumbi]

Virtual retinal display
The Virtual Retinal Display (VRD) is a new technology for creating visual images developed at the Human Interface Technology Laboratory (HIT Lab) by Dr. Thomas A. Furness II. It creates images by scanning low power laser light directly onto the retina which results in images that are bright,high contrast and high resolution. The VRD readily creates images that can be easily seen in ambient roomlight and it can create images that can be seen in ambient daylight. The development of this device has been driven by the need for a ubiquitious display that is
lightweight, full color and high resolution. patients with macular degeneration, a degenerative disease of the retina and patients with keratoconus can see with the help of VRD. VRD images are also readily viewed superimposed on ambient room light. The technologies of virtual reality (VR) and augmented reality (AR) are the new paradigm for visual interaction with graphical environments.

Uses in Virtual reality:
interactivity and immersion must be provided. a visual display that is high resolution and wide field of view is necessary for this application.

Uses in artificial reality:
a visual display that allows ready viewing of the real world, with
superimposition of the computer graphics is necessary. The VRD has features that can be optimized for
the human computer interfaces.

Components:
There are LASER,VGA input, Controlling Electronics, Modulator, Horizontal Scanner, Vertical Scanner and Delivery Optics in the device. Laser sources are introduced into a fiber optic strand which brings light to the Mechanical Resonance Scanner (MRS). The MRS consists of a polished mirror on a mount. The mirror oscillates in response to pulsed magnetic fields produced by coils on the system mounting. The high frequency of scanning allows the fine resolution in the images produced. The scanned light is then
passed to a mirror galvanometer or second MRS which then scans the light in the vertical direction. The horizontally and vertically scanned light is then introduced to the eye and can be be sent through a mirror/combiner to allow the user to view the scanned image superimposed on the real world.

Full report:

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Also see:
http://patentstorm.us/patents/6008781.html
http://patentstorm.us/patents/5701132.html
http://hitl.washington.edu/projects/comm....php?idx=1

[arunchandrabose]

ABSTRACT
The Virtual Retinal Display (VRD ) technology also known as a retinal scan display (RSD) or retinal projector is a new display technology being developed at Microvision Inc. The displayed image is scanned onto the viewer s retina using low-power red, green, and blue light sources. Microvision s proprietary miniaturized scanner designs make VRD system very well suited for head-mounted displays. In this paper we discuss some of the advantages of the VRD technology, various ocular designs for HMD and other applications, and details of constructing a system MTF budget for laser scanning systems that includes electronics, modulators, scanners, and optics , VRDs can give the user the illusion of viewing a typical screen-sized display hovering in the air several feet away. In principle the technology can provide full-color, high-resolution dynamic displays

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normally VRD unit consists of 4 modules; drive electronics to break down an incoming source image into an information stream, a light source made up of laser(s) or LED(s), a scanner bank made up of horizontal and vertical scanners, and a lens to expand the image that projects through the scanners. As in a television, the scanners rapidly oscillate left-to-right or down-to-up, selectively permitting colors through in precise configurations that produce a high-resolution 2mm x 2mm field of pixels. Then a lens acting as an expander boosts the size of the image to something like 18mm x 18mm, allowing for a larger and more natural image. The pixel field is then projected onto the eye, where the eye's lens focuses the image onto the retina. Aside from tapping into the optic nerve itself, there may be no more effective way to display an image

read more
http://en.wikipediawiki/Virtual_retinal_display
http://swatijaininstetechno/VIRTUAL%20RE...SYSTEM.doc

[bvnod]

hey please read
http://seminarsprojects.net/Thread-virtu...isplay-vrd
http://seminarsprojects.in/attachment.php?aid=2775
http://seminarsprojects.net/Thread-a-ret...plications
http://seminarsprojects.net/Thread-virtu...al-display

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