Virtual Retinal

8/3/2019 Virtual Retinal

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VIRTUAL RETINAL

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CONTENTS

1.INTRODUCTION

2.WHY VRD..?

3.BLOCK DIAGRAM OF VRD

4.FUNCTIONAL BLOCK DIAGRAM

5.HOW IT WORKS..?

6.IMAGE FORMATION

7.APPLICATIONS

8.ADVANTAGES

9.LIMITATIONS 10.FUTURE SCOPE

11.CONCLUSION

12.REFERENCE



INTRODUCTION

PDD under development in HIT lab,University of Washington.

Not a screen based technology. Scans light directly on to retina of

eye. Full colour, high resolution, high

brightness wide field of view . Display without flickering. Potential applications include HMDs

for military, aerospace, engineering,medical

Display technology for future



BASICS OF VRD

Substitute to conventional bulky and powerhungry VDUs.

Light is focused to a miniscule image(frame)on retina.

SLD or LED triads of R,G&B emits light.Mixing in proportions can produce anycolour.

As light scans the retina, it is intensity

modulated by the video signal. Scanning is performed directly onto retina in

a raster pattern through collimating optics.



WHY VRD…..???

Large sized monitors

High weight and power consumption

User should focus at a particular depth

Limited brightness

Reduced the 3D effect

virtual reality applications



BLOCK DIAGRAM OF VRD



HOW IT WORKS…??



HOW IT WORKS (cont…)

SDE receive and process incomingvideo signal

Image compensation and display

control Modulated light beam from laser light

sources

Horizontal scanning in raster pattern

Vertical scanning at lower frequency

Light passed through pupil expander

Scanned raster image



IMAGE FORMATION

Resultant image perceived as wide field of view image originating from someviewing distance in space.



APPLICATIONS

VRDs can reduce the read-time and can actas always present guides for many tasks. Thevarious fields of application of VRDtechnology are listed.

Radiology

Surgery Therapeutics (Scanning Laser

Ophthalmoscope)

Production

Communication Augmented \ Virtual reality

Aerospace

Military



MILITARY APPLICATIONS

Technologyadvantage

situationalawareness

Head mounteddisplays

High quality image

Public safetysystems



MEDICAL APPLICATIONS

Imaging techniques indiagnostics

Portable digitized

information. Image guided surgery

Superimposed image overtarget

Assistance in laproscopyand endoscopy



COMMERCIALAPPLICATIONS Augmented(see through) vision

guidance in manufacturing process.

Access to blueprints and plans.

Digitized repair manuals.

Inventory control

Gaming industries

Consumer electronics



ADVANTAGES

Small size and weight

Low power consumption

High resolution and luminance

Image overlaying

Reasonable cost

Wide range of applications



LIMITATIONS

Cannot be used as a public displaysystem

Head and eye tracking may be

required Should be more light

Resolution to be improved

Resolution of human vision 8400 x5400 With VRD 7680 x 4320



FUTURE SCOPE

Depends on affordability

LEDs as light sources

Expanding PC screen into real world

Enhanced media applications likevirtual holodecks

Replacement of cell phone and car

navigator screens



CONCLUSION

Break through in imaging technology

Stream photons to receptors of eye

No edges and no flickers

Less hazardous to vision

Advanced AR applications



REFERENCE

Michael R Tidwell, “A virtual retinaldisplay for augmenting ambientenvironment”, University of

Washington,1995 IGIC Inc.staff, “Emerging markets &

virtual reality”, Information

Gatekeepers, 1992 http://www.hitl.washington.edu

http:// www.microvision.com

http://





Virtual Retinal

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