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

1. 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)

2. CONTENTS:
• ABSTRACT
•INTRODUCTION
• BLOCK DIAGRAM
• SYSTEM DESCRIPTION
• WORKING
• FEATURES
• APPLICATIONS
• ADVANTAGES
• DISADVANTAGES
• CONCLUSION

3. 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.

5. 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.

6.  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

7. Block Diagram of VRD

8.  Video Electronics
 Light Sources and Modulators
 Scanners
Components of the VRD

10. 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

13. WORKING OF VRD

14.  Size and Weight
 Short transient light emission
 Field of View
 Color and Intensity Resolution
 Coherent light
 Inclusive and See Through
VRD Features

15. Applications of VRD
 Medical
 Manufacturing
 Communications
 Virtual Reality
 Military
 Entertainment

17.  Brightness
 Resolution
 Cost
 Size
Advantages

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

19. • 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

20. 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.

21. 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

22. Thank You

23. ANY
QUERIES???