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Virtual Retinal Display VRD
Post: #1

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
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

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Post: #2
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 III. 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.

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.

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Post: #3
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Post: #4
The Virtual Retinal Display (VRD) is a personal display device under development at the University of Washington's Human Interface Technology Laboratory in Seattle, Washington USA. The VRD scans light directly onto the viewer's retina. The viewer perceives a wide field of view image. Because the VRD scans light directly on the retina, the VRD is not a screen based technology.
The VRD was invented at the University of Washington in the Human Interface Technology Lab (HIT) in 1991. The development began in November 1993. The aim was to produce a full color, wide field-of-view, high resolution, high brightness, low cost virtual display. Microvision Inc. has the exclusive license to commercialize the VRD technology. This technology has many potential applications, from head-mounted displays (HMDs) for military/aerospace applications to medical society.
The VRD projects a modulated beam of light (from an electronic source) directly onto the retina of the eye producing a rasterized image. The viewer has the illusion of seeing the source image as if he/she stands two feet away in front of a 14-inch monitor. In
reality, the image is on the retina of its eye and not on a screen. The quality of the image he/she sees is excellent with stereo view, full color, wide field of view, no flickering characteristics

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