A SEMINAR ON

Virtual Retinal Display

SUBMITTED BY B.LEENA PRIYA 1071018 CSE

Submitted to

DEPARTMENT OF COMPUTER SCIENCE AND ENGINEERING

SRI PADMAVATI MAHILA VISVAVIDYALAYAM(WOMEN’S UNIVERSITY)

 

 

CONTENTS:

• ABSTRACT •INTRODUCTION

• BLOCK DIAGRAM

• SYSTEM DESCRIPTION

• WORKING

• FEATURES

• APPLICATIONS

• ADVANTAGES

• DISADVANTAGES

• CONCLUSION

ABSTRACT

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 was invented at HIT Lab 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.

It has many potential applications like head-mounted displays (HMDs) for military/aerospace, applications to medical society.

Introduction 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

Using VRD images are painted themselves directly onto our retina.

VRD consists of light source, a modulator, vertical and horizontal scanners and imaging optics.

VRD is a visual display device.

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.

The quality of the image he/she sees is excellent with stereo view, full color, wide field of view, no flickering characteristics.

This special method results in images that are bright, high contrast and high resolution.

In theory, the VRD allows for accommodation to be modulated pixel by pixel as the image is being scanned

Virtual Retinal Display

Block Diagram of VRD

Video Electronics

Light Sources and Modulators

Scanners

Components of the VRD

System Description

Control and drive electronics:• processing of input video signal• generation of control signals for acoust

optical modulators • synchronization of vertical and

horizontal scanner• overall system timing

WORKING OF VRD

Size and Weight

Short transient light emission

Field of View

Color and Intensity Resolution

Coherent light

Inclusive and See Through

VRD Features

Applications of VRD

Medical

Manufacturing

Communications

Virtual Reality

Military

Entertainment

Brightness

Resolution

Cost

Size

Advantages

• Color range: High saturated pure colors • Luminance • Viewing Modes(60nW~300nW) See through mode (Augmented mode)

Occluded mode

• Power Consumption

• There is no protection against radiation  • It can assist to the military industry, it will still be a technology used by humans against humanity and therefore may do more harm then good.

• The image sent into the eye will surely interfere with the reality objects and can be distract the user when his attention is most needed

Disadvantages

Conclusion The VRD is a safe new display technology.

The VRD readily creates images that can be easily seen in ambient room light and it can create images that can be seen in ambient daylight.

The combination of high brightness and contrast and high resolution make the VRD an ideal candidate for use in a surgical display.

Further, tests show strong potential for the VRD to be a display technology for patients with low vision.

Future projects will be:

• Study the basic psychophysical processes of image perception from scanned lasers including resolution, contrast and color perception

• Study the interaction of VRD images with images from the real world • Study VRD image perception in partially sighted users.

• Design VRD light scanning paradigms to optimize image resolution, contrast in low vision subjects. • Design text, image and computer icon representations for low vision users and test speed and accuracy of recognition of those representations in the Seattle low vision population.

Thank You

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