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8/3/2019 Virtual Retinal
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VIRTUAL RETINAL
DISPLAY
AJIN AS7csRoll no;4
8/3/2019 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
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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
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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.
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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
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BLOCK DIAGRAM OF VRD
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HOW IT WORKS…??
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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
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IMAGE FORMATION
Resultant image perceived as wide field of view image originating from someviewing distance in space.
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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
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MILITARY APPLICATIONS
Technologyadvantage
situationalawareness
Head mounteddisplays
High quality image
Public safetysystems
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MEDICAL APPLICATIONS
Imaging techniques indiagnostics
Portable digitized
information. Image guided surgery
Superimposed image overtarget
Assistance in laproscopyand endoscopy
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COMMERCIALAPPLICATIONS Augmented(see through) vision
guidance in manufacturing process.
Access to blueprints and plans.
Digitized repair manuals.
Inventory control
Gaming industries
Consumer electronics
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ADVANTAGES
Small size and weight
Low power consumption
High resolution and luminance
Image overlaying
Reasonable cost
Wide range of applications
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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
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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
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CONCLUSION
Break through in imaging technology
Stream photons to receptors of eye
No edges and no flickers
Less hazardous to vision
Advanced AR applications
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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://
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