screen less display documentation

A.Manikanta(11621A0401) AEC,Bhongir
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1. INTRODUCTION
Technology is making a huge modification in existing machines or tools in order to solve
problem at higher level and make life comfortable. Screen less display is one of the most
interesting subjects in technologies and research on this is increasing by exponential scale
day by day. It is a system of transferring information/data though an electronic video
source without using screen at all. Few parts of this technology is being used at present
but they are not so advance yet.Screenless display is the present evolving technology in
the field of the computer-enhanced technologies. It is going to be the one of the greatest
technological development in the coming future years. Several patents are still working
on this new emerging technology which can change the whole spectacular view of the
screenless displays. Screen less display technology has the main aim of displaying (or)
transmitting the information without any help of the screen (or) the projector. Screen less
displays have become a new rage of development for the next GEN-X. Screenless videos
describe systems for transmitting visual information from a video source without the use
of the screen.
Well screenless display, AKA hologram, has such amazing potential that my hope is that
the internet can be a medium for collaboration of ideas and information about screenless
display that could help break down the barriers that prevent us from making it a reality.
Essentially screenless display is a projection that can be seen projected onto the air itself.
The only screenless display that has been achieved to my knowledge still uses fog as a
medium to reflect light. Other options have been to use mirrors and plastic film to imitate
the idea, but no one has been able to reflect light off of air itself. Can it be done? It’s
quite possible that it can. Light does reflect off of large amounts of air as we see in our
atmosphere but doing it in such a manner that we could pinpoint it to a single area is
immensely difficult. So why not take some time and look over some ideas I have
collected about the possibilities of screenless display and maybe even share some of your
own. Check some of the links below to get a better grasp on the development of the
technology.
1.1 The Basic System
In the past similar systems have been made by projecting a defocused image directly in
front of the user's eye on a small "screen", normally in the form of large glasses. The user
focused their eyes on the background, where the screen appeared to be floating. The
disadvantage of these systems was the limited area covered by the "screen", the high
weight of the small televisions used to project the display, and the fact that the image

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would appear focused only if the user was focusing at a particular "depth". Limited
brightness made them useful only in indoor settings as well.
Only recently a number of developments have made a true VRD system practical. In
particular the development of high-brightness LEDs have made the displays bright
enough to be used during the day, and adaptive opticshave allowed systems to
dynamically correct for irregularities in the eye (although this is not always needed). The
result is a high-resolution screenless display with excellent color gamut and brightness,
far better than the best television technologies.
In a conventional display a real image is produced. The real image is either viewed
directly or, as in the case with most head-mounted displays, projected through an optical
system and the resulting virtual image is viewed. The projection moves the virtual image
to a distance that allows the eye to focus comfortably. No real image is ever produced
with the VRD. Rather, an image is formed directly on the retina of the user's eye.
Fig 1. Basic Display
1.2 History Behind Screenless Display
Reto Meier, an “Android Developer Advocate for Google” recently laid out a fairly
science-fiction account of where computer (or at least mobile) interfaces are headed.
In the spirit of the best futurism, all of his predictions - from Augmented Reality eye
glasses to advanced batteries - have parallels in the real world. What follows is a walk-
through of the future, expressed in terms of the not quite ready for prime time discoveries
coming out of labs today.

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Working on the average laptop is like working on a desk that’s as big as a sheet of paper.
That’s why all our “files” are half an inch high. The key to productivity and immersion is
more, bigger screens - hence the proliferation of external monitors, secondary reading
devices and even mobile phones with improbably large screens.
So-called “Pico” projectors (named for their tiny size) already exist - there’s even an HD
version, the Forever Plus, that’s less than an inch on its longest dimension. And there are
mobile phones, such as the Samsung Show, which have built-in picoprojectors - so
outside of market demand (how many of us really need this?) there’s nothing to stop this
prediction from coming true.
1.3 Technology used in Screenless Display
1.3.1. Interactive Projection and Visual Display System
The biggest impact in screenless technology has been seen in the use of optical
technology. Whether talking of VRD (virtual retinal display), RSD (retinal scanning
display) or LOE (light-guide optical element), optical technology is being used by
consumer electronic corporations like Apple to the military and even the health care
industry. Optical technology enables personal screenless displays by projecting images
and data from computers, DVD players, or VCRs into the viewer's eye, displaying them
in the visual field of the viewer. For instance, Microvision Inc. has created helmet
mounted displays in which an Army tank commander can view the surrounding area from
topside while still viewing a translucent map that floats a couple of feet away.

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Fig 2. Interactive projection
1.3.2. 3D Display Projection Technology
With the large influx of new displays into the market boasting '3D support', we thought
we would produce an article which outlines some of the key technologies being used,
where they differ and how they work. We will look at the two main techniques being
used today, those being active shutter and passive polarization technologies. We will also
discuss the trends in desktop displays from a 3D point of view as well as looking at the
other aspects being developed to support 3D, such as panel technology.
To begin with an explanation, a modern 3D display / monitor is capable of conveying a
stereoscopic perception of 3D depth to the viewer. The basic requirement is to present
offset images that are displayed separately to the left and right eye. Both of these 2D
offset images are then combined in the brain to give the perception of 3D depth.
Although the term "3D" is ubiquitously used, it is important to note that the presentation
of dual 2D images is distinctly different from displaying an image in 3 full dimensions.
The most notable difference is that the observer is lacking any freedom of head
movement and freedom to increase information about the 3-dimensional objects being
displayed. Holographic displays do not have this limitation, so the term "3D display" fits
accurately for such technology. In modern displays the term 3D is actually an
overstatement of capability and is referring to dual 2D images as being "3D". The
accurate term "stereoscopic" is more cumbersome than the common misnomer "3D",
which has been entrenched after many decades of unquestioned misuse.
It is generally expected that most consumers have the desire to migrate to 3D systems
from 2D. It is predicted that the 3D market will grow tremendously as soon as the

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problems in the existing products are eliminated and the issues on basic infrastructure,
such as price competitiveness and 3D content, will be resolved. It is highly likely that the
content industry will also make a fast transition into 3D in all areas such as TV, film, and
game and have already begun to make this change.
Fig 3. 3D projection
The Bees Knees
Screenless display is the emerging display technology. In these examples you see that the
user is able to interact with a three dimensional image projected into thin air. Imagine
your desktop floating in the space before your eyes waiting for your interaction.
Fig 4. Bees Knees display

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Screenless display technology is likely to affect:
1. Lighting and projection technologies
2. Software development/design
3. Lifestyles of the visually impaired
4. Career opportunities for the visually impaired
Screen less computing systems can bedivided mainly into 3 groups:
1.Visual image
2.Retinal direct
3.Synaptic interface

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2. BACKGROUND
The first screen-less display that needs mentioning is Google Glass. This device has been
tested for the past year, and some lucky individuals have even got their devices already.
Google Glass sits on the face like a pair of glasses, and on one eye it has a block of glass
that allows you to see augmented reality. Images can be displayed right in front of your
eye, as well as text and information about objects and places that are in front of you. This
technology is only in its early stages, but definitely shows that screen-less displays will
become a natural form of media consumption in the future.
Fig 4. Google Glass
2.1.VISUAL IMAGE
Visual Image screen less display includes any screen less image that the eye can perceive.
The most common example of Visual Image screen less display is a hologram.
Holographic messages, which we previously saw only in movies like Star Wars are about
to become reality through a new technology arrived directly from Japan. It’s True 3D,
which is based on older technology, developed by AIST and Keio University in 2006.
This new projection system can be used to present images without the need for a screen.
The system works by focusing a laser beam that generates a plasma environment from the
oxygen and nitrogen present in air, thus enabling it to display holographic images.
According Ubergizmo.com, the projected holographic images appear as 3D floating
objects in mid-air.
At this point, the system creates approximately 50,000 points per second and features a
frame rate of 10-15 FPS, but Japanese scientists are trying to increase it to 24-30 FPS. So
far, the images are only monochromatic (single color), green, but multi-colored images
but can also be created using lasers emitting at different wavelengths e.g. blue and red.

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Fig 5. Visual display
HOLOGRAM
Holograms were used mostly in telecommunications as analternative to screens.
Holograms could be transmitted directly, or they could be stored in various storage
devices (such as holodiscs) the storage device can be hooked up with a holoprojector in
order for the stored image to be accessed.
Fig 6. Example of visual Image

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Debatably, virtual reality goggles (which consist of two smallscreens but are nonetheless
sufficiently different from traditional computer screens to be considered screen less) and
heads-up display in jet fighters (which display images on the clear cockpit window) also
are included in Visual Image category. In all of these cases, light is reflected off some
intermediate object (hologram, LCD panel, or cockpit window)before it reaches the
retina. In the case of LCD panels the light is refracted from the back of the panel, but is
nonetheless a reflected source[3]. The new software and hardware will enable the user to,
in effect; make design adjustments in the system tofit his or her particular needs,
capabilities, and preferences. They will enable the system to do such things as adjusting
to users’ behaviors in dealing with interactive movable type.
Fig 7. Hologram Display
Holographic technology has unfortunately not gone very far past trickery with mirrors.
This form of photography provides a three dimensional image, and some technologies are
now creating images using lenses, helium neon and holographic film. Scientists will not
have a fully working holographic table prepared for market any time soon, but it is
definitely on the cards for the future. The only downfall of this kind of system, however,
is that the orientation and viewing angle of a viewer will determine the quality of the
image that can be seen – meaning that so far, holographs are not ideal for media or
information consumption.

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Holographs can work by using a laser beam that can interfere with an object beam. When
these two beams get in the way of one another, they can create what looks like a three
dimensional image. This image can then be recorded for processing by recording the
diffraction of the light and the way in which the beams interfere with one another.
2.2.RETINALDISPLAY
Virtual retinal display systems are a class of screen less displays in which images are
projected directly onto the retina as shown in figure 3. They are distinguished from visual
image systems because light is not reflected from some intermediate object onto the
retina; it is instead projected directly onto the retina. Retinal Direct systems, once
marketed, hold out the promise of extreme privacy when computing work is done in
public places because most inquiring relies on viewing the same light as the person who
is legitimately viewing the screen, and retinal direct systems send light only into the
pupils of their intended viewer.
Fig 8. Block diagram of Retinal Display

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Fig. 9. Retinal Display
With a retinal display light is not reflected off an immediate object, like in a visual image,
but it is projected directly onto the retina. This can be handy in that one is not limited by
physical screen size because there is no immediate object to be viewed, retinal display
can be used to keep things such as financial information safe from snooping eyes. The
image can take up the entire field of vision. We’ve seen the potential of retinal displays in
movies like Terminator.
Fig. 10. Retinal Display in Glass Format

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2.3 SYNAPTIC INTERFACE
Synaptic Interface screen less video does not use light at all. Visual information
completely bypasses the eye and istransmitted directly to the brain. While such systems
have yetto be implemented in humans, success has been achieved in sampling usable
video signals from the biological eyes of a living horseshoe crab through their optic
nerves, and in sending video signals from electronic cameras into the creatures' brains
using the same method.
Fig.11. Synaptic Interface
Brain–computer interface
A brain–computer interface (BCI), often called a mind-machine interface (MMI), or
sometimes called a direct neural interface (DNI), synthetic telepathy interface (STI) or a
brain–machine interface (BMI), is a direct communication pathway between the brain
and an external device. BCIs are often directed at assisting, augmenting, or repairing
human cognitive or sensory-motor functions.
Research on BCIs began in the 1970s at the University of California Los Angeles
(UCLA) under a grant from the National Science Foundation, followed by a contract

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from DARPA. The papers published after this research also mark the first appearance of
the expression brain–computer interface in scientific literature.
The field of BCI research and development has since focused primarily on
neuroprosthetics applications that aim at restoring damaged hearing, sight and movement.
Thanks to the remarkable cortical plasticity of the brain, signals from implanted
prostheses can, after adaptation, be handled by the brain like natural sensor or effector
channels.[3] Following years of animal experimentation, the first neuroprosthetic devices
implanted in humans appeared in the mid-1990s.
Fig. 12. Brain-computer interface
The most profound effect will come from the development of the synaptic interface
technology. This technology will allow people who are visually impaired to see just as
the hearing impaired are able to hear through cochlear implants. Imagine a visually
impaired person gaining the freedom to drive again! This will also remove occupational
limitations of the visually impaired.

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The ability to control a computer using only the power of the mind is closer than one
might think. Brain-computer interfaces, where computers can read and interpret signals
directly from the brain, have already achieved clinical success in allowing quadriplegics,
those suffering “locked-in syndrome” or people who have had a stroke to move their own
wheelchairs or even drink coffee from a cup by controlling the action of a robotic arm
with their brain waves. In addition, direct brain implants have helped restore partial
vision to people who have lost their sight.
Recent research has focused on the possibility of using brain-computer interfaces to
connect different brains together directly. Researchers at Duke University last year
reported successfully connecting the brains of two mice over the Internet (into what was
termed a “brain net”) where mice in different countries were able to cooperate to perform
simple tasks to generate a reward. Also in 2013, scientists at Harvard University reported
that they were able to establish a functional link between the brains of a rat and a human
with a non-invasive, computer-to-brain interface.

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3. THE WORKING PRINCIPLE
There are several new emerging ways for the technologicaldevelopment of the working
principle of the screen less displays. Several software’s are merging for the GEN-X
wonder view. Any computer system that can run the mudoc software can present text that
has been set in interactive movable type. Most of the mudocs that are consumed in the
next few years will be consumed with conventional personal computers, e-book readers,
and other kinds of display and projection devices that are now in use. Very soon it
appears to be a new kind of input/output system will facilitate communication and
interaction between the computer and the computer user. This new human/computer
interface is the telereader terminal. Visual Image is a bitmap manipulation and
composition product. Bitmaps can be manipulated independently, in the Image Mode or
multiple bitmaps can be composited Together in the Object Mode to create a "collage".
Visual Image can create and Manipulate images of any size: the only limitation is the
amount of memory resources your system has.
A. Creating Visual Catalog Files with Visual Image Visual Image gives you the ability to
create files in the EYE file format for use in the Visual Catalog program. These EYE files
can be used to create catalogs of images in logical sub groupings: for example, you can
create a catalog file in the
EYE format that lists all images of building materials (brick, concrete, stone, etc.). The
File, Export Project command creates an EYE file that refers to all of the images that are
currently loaded into Visual Image. When you select this command, you are prompted to
enter a filename for the EYE file that is to be created. If you have created any image in
Visual Image that are not yet saved to disk you will be asked if you wish to include those
images in the EYE file and if so, you are prompted to store those images as bitmaps. The
File, Exports Editor Command in Visual Image allows you to pack and choose those
image files on disk that you wish to include in a catalog EYE file. When you select File
in Export Editor, a file browser appears from which you can choose the image files to
include. Use this browser to select images to add to a project file for use in Visual
Catalog.
3.1 How Vision works
In Screenless display images projecting directly onto a person’s retina, not only avoiding
the need for weighty hardware, but also promising to safeguard privacy by allowing
people to interact with computers without others sharing the same view. By January
2014, one start-up company had already raised a substantial sum via Kickstarter with the
aim of commercializing a personal gaming and cinema device using retinal display. In the

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longer term, technology may allow synaptic interfaces that bypass the eye altogether,
transmitting “visual” information directly to the brain.
We can see things because of reflected light. Light bounces of an object and enters our
eye. This light then focuses on the retina to form an image.
Fig. 13. Vision process
3.2Additional Software and Hardware Requirements
1. To facilitate the interactivity.
2. To optimize the user’s perceptual and cognitive capabilities.
3. To provide the most healthful visual environment for the user.
4. Responding to a variety of user commands (using voice, hand, foot, or other signal
methods).
5. Providing blink cues or blinks responses.
6. Modifying output to compensate for changes in user’s physiology or reaction time, etc.
The new software and hardware will enable the user and the system to better exploit each
other’s capabilities and to function as a fully integrated team.

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4. VIRTUAL RETINAL DISPLAY
STRUCTURE AND IMPLEMENTATION
A virtual retinal display (VRD), also known as a retinal scan display (RSD), is a new
display technology that draws a raster display (like a television) directly onto the retina of
the eye. The user sees what appears to be a conventional display floating in space in front
of them. Similar systems have been made by projecting a defocused image directly in
front of the user's eye on a small "screen", normally in the form of large sunglasses. The
user focuses their eyes on the background, where the screen appeared to be floating. The
disadvantage of these systems was the limited area covered by the "screen", the high
weight of the small televisions used to project the display, and the fact that the image
would appear focused only if the user was focusing at a particular "depth". Limited
brightness made them useful only in indoor settings as well. Only recently, a number of
developments have made a true VRD system in practice. In particular, the development
of high-brightness LEDs have made the displays bright enough to be used during the day
and adaptive optics have allowed systems to dynamically correct for irregularities in the
eye (although this is not at all needed in all situations). The result is a high-resolution
screen less display with excellent color range and brightness, far better than the best
television technologies. The VRD was invented at the University of Washington in the
Human Interface Technology Lab in 1991. Most of this research into VRDs to date has
been in combination with various virtual reality systems. In this role VRDs have the
potential advantage of being much smaller than existing television-based systems. They
share some of the same disadvantages however, requiring some sort of optics to send the
image into the eye, typically similar to the sunglasses system used with previous
technologies. It can be also used as part of a wearable computer system. More recently,
there has been some interest in VRDs as a display system for portable devices such as
cell phones, PDAs and various media players. In this role the device would be placed in
front of the user, perhaps on a desk, and aimed in the general direction of the eyes. The
system would then detect the eye using facial scanning techniques and keepthe image in
place using motion compensation. In this role the VRD offers unique advantages, being
able to replicate a full sized monitor on a small device. The most recent innovations in
mobile computing have been based around touch screen technology[6]. The future of
mobile devices is both touch less and screen less. By 2020 the mobile phone as we know
it today will disappear and something very different will take its place. Instead of
touching a screen, we will interact with technology directly through our senses, through
technology embedded in what he is calling “Internet Glasses”. Voice was always
organized in sessions with a beginning and an end. Today we have threads, i.e. when a
thread is started it never ends and we have many continuing in parallel. Think of your

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email, RSS feeds, Twitter, etc. So this is how our brain works. The hone of tomorrow
will be telecoupling and related machines and future is bypassing screens and keyboards
altogether as in figure 6. The two key technologies will be laser based displays, which
display images directly onto our retinas and brain wave sensing implants as shown in
figure 5. This will allow technology to integrate with our ‘reality vision’ much more
seamlessly. We are on the verge of a hardware revolution that will make this all possible,
as well as the cloud-based information streaming that will enable the user interface to
become a reality.
Fig. 14. Basic block diagram of the Virtual Retinal Display.
The Virtual Retinal Display (VRD) is a unique approach to developing a high-resolution
head-mounted display currently under development at the University of Washington's
Human Interface Technology (HIT) Laboratory. Rather than looking at a screen though a
magnifier or optical relay system, the viewer of the VRD has a scanned beam of light
enter the pupil of the eye and focused to a spot on the retina. This type of optical system
is subject to different design constraints than a typical HMD. With the VRD it may be
possible to realize higher resolution, greater color saturation, higher brightness and larger
field-of-view than a traditional LCD or CRT screen-based system.
Fig. 15.VirtualRetinal Display –Example.

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Fig. 16. System Architecture
4.1 Background Of The Invention
This invention relates to retinal display devices, and more particularly to a method and
apparatus for mapping and tracking a viewer's eye.
A retinal display device is an optical device for generating an image upon the retina of an
eye. Light is emitted from a light source, collimated through a lens, then passed through a
scanning device. The scanning device defines a scanning pattern for the light. The
scanned light converges to focus points on an intermediate image plane. As the scanning
occurs the focus point moves along the image plane (e.g., in a raster scanning pattern).
The light then diverges beyond the plane. An eyepiece is positioned along the light path
beyond the intermediate image plane at some desired focal length. An “exit pupil” occurs
shortly beyond the eyepiece in an area where a viewer's eye pupil is to be positioned.
A viewer looks into the eyepiece to view an image. The eyepiece receives light that is
being deflected along a raster pattern. Modulation of the light during the scanning cycle
determines the content of the image. For a see-through virtual retinal display a user sees

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the real world environment around the user, plus the added image of the display projected
onto the retina.
4.2 Working Of Virtual Retinal Display
A viewer wearing a head-mounted virtual retinal display typically moves their eye as
they look at images being displayed. According to the invention, the direction the viewer
looks is tracked with the display. Prior to tracking, a map of the viewer's eye is generated
by the display. The map includes ‘landmarks’ such as the viewer's optic nerve, fovea, and
blood vessels. Thereafter, the relative position of one or more landmarks is used to track
the viewing direction. The head-mounted display includes a light source and a scanner.
The scanner deflects light received from the light source to scan a virtual image onto a
viewer's retina in a periodic manner. During each scanning period, light is deflected along
a prescribed pattern. To generate a map, and thereafter to monitor viewing direction, light
reflected off the viewer's retina is monitored. Some of the reflected light travels back into
the display device. The content of the reflected light will vary depending upon the image
light projected and the features of the viewer's retina. During the initial mapping stage,
the content of the image light can be fixed at a constant intensity, so that the content of
the reflected light is related only to the feature's (i.e., landmarks) of the retina. The
changing content of the reflected light is sampled at a sampling rate and stored. The
scanner position at the time of each sample is used to correlate a position of the sample.
The relative position and the content represent a map of the viewer's retina.
Fig. 17.Optical schematic diagram of a virtual retinal display having an eye tracking
capability

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According to one aspect of the invention, the light reflected from the viewer's eye travels
back into an eyepiece and along a light path within the retinal display device. In a
specific embodiment the reflected light is deflected by the scanner toward a beamsplitter.
The beamsplitter deflects the reflected light toward a photodetector which samples the
reflected light content. The beamsplitter is positioned between the light source and the
scanner of the retinal display device.
For generating a virtual image, light emitted from the light source passes through the
beamsplitter to the scanning subsystem and onward to the eyepiece and the viewer's eye.
Light reflected from the viewer's eye passes back along the same path but is deflected so
as not to return to the light source. Instead the light is deflected toward the photodetector.
Thus, the beamsplitter passes light which is incident in one direction (e.g., light from the
light source) and deflects light which is incident in the opposite direction (e.g., reflected
light from the viewer's eye).
According to another aspect of the invention, a specific feature of the retina (e.g., fovea
position) is monitored over time to track where the viewer is looking (i.e., the viewer's
center of vision). The landmarks in the retina which correspond to such feature will cause
the reflected light to exhibit an expected pattern. The relative position of such pattern in
the reflected light will vary according to the viewing direction. By identifying the pattern
and correlating the relative orientation of the pattern to the orientation of the
corresponding feature in the map, the change in viewing direction is determined. In
various applications, such position indication is used as a pointing device or is used to
determine image content. For example, as a pointing device the fovea position indicates
pointer position. A blink of the eye for example, corresponds to actuating a pointing
device (e.g., “clicking” a computer mouse.)
According to another aspect of the invention, the map of the viewer's retina is stored and
used for purposes of viewer identification. In a security application for example, a viewer
is denied access to information or denied operation of a computer or display when the
viewer's retina does not correlate to a previously stored map of an authorized user.
According to an advantage of the invention, the display can track where a viewer is
looking, use the viewer's eye as a pointer, and identify the person using the display.
These and other aspects and advantages of the invention will be better understood by
reference to the following detailed description taken in conjunction with the
accompanying drawings.
4.3 Potential Advantages of the Virtual Retinal Display
It is really interesting to note why this family of imaging systems score better than the
conventional display systems.

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A) Brightness
One problem with conventional helmet mounted display image sources is the low
luminance levels they produce. Most liquid crystal array image sources have insufficient
luminance levels for operation in a see-through display. The VRD, however, does not
contain individual Lambertian (or nearly Lambertian) pixel emitters (liquid crystal cells
or phosphors) as do most LCD arrays and CRT's. The only light losses in the VRD result
from the optics (including the scanners and fiber coupling optics). There is no inherent
tradeoff, however, between resolution and luminance as is true with individual pixel
emitters. In individual pixel emitters, a smaller physical size increases resolution but
decreases luminance. In the Virtual Retinal Display, intensity of the beam entering the
eye and resolution are independent of each other. Consequently, the VRD represents a
major step away from the traditional limitations on display brightness.
B) Resolution
As resolution requirements increase, the number of picture elements must increase in a
screen based display. These greater packing densities become increasingly difficult to
manufacture successfully. The VRD overcomes this problem because the resolution of
the display is limited only by the spot size on the retina. The spot size on the retina is
determined primarily by the scanner speed, light modulation bandwidth, and imaging
optics.
C) Yield
One limiting aspect in the manufacture of liquid crystal array image generators is the
yield and reliability of the hundreds of thousands of individual liquid crystal cells present
in these displays. For a liquid crystal array display to function properly at all times, each
picture element must function properly. The Virtual Retinal Display requires only
constant functionality from the light sources and the scanners. As resolution increases in
virtual image displays, liquid crystal arrays will contain more and more individual liquid
crystal cells. The Virtual Retinal Display will gain an increasing advantage over liquid
crystal array image generators in terms of yield as resolution demands increase in the
future.
D) Size
The theoretical size for horizontal and vertical scanners plus light sources for the VRD is
smaller than the size of conventional liquid crystal array and CRT image sources. A
typical size for a liquid crystal array image generator for helmet mounted display
applications is one inch by one inch. The Mechanical Resonant Scanner used in this
project was approximately 1 [cm] by 2m [cm]. Furthermore, the problem of scanner size
has not been directly addressed. Further size reduction is certainly possible. It should be
noted that light sources for a smaller, usable full color VRD must be much smaller than
the sources used in this project. The potential size of light emitting diodes and diode
lasers indicate that these sources show greatest promise for future systems in terms of
size.

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5. APPLICATIONS OF THE SCREENLESS DISPLAY
The main use of the screen less displays are used for the development of the mobile
phones which are mainly used by the old and blind people as shown in figure 7. This type
of the invention of the screen less displays was first done on the mobile phone named
OWASYS 2CC. This model is very useful for the old, blind, and even for the people with
less vision power.
Fig. 18. Application applied to mobile Technology
Screen less displays technology is also implemented for the development of the screen
less laptops. A laptop without an LCD can be a very useful portable solution when
connected toCRT or fixed LCD monitors. Laptops without screens would also be a green
solution, giving value to donated CRT monitors that would otherwise be heading for
landfills. Portability means that volunteers, who don’t always have the time to travel to
people’s homes, can more easily maintain this computer. Screenless displays are also
widely applicable in the field of the holograms projection. Hologram projection is a result
of a technological innovation that truly helps in touch less holographic interfaces. In fact,
hologram projection projects 3D images of so high quality that it feels as if one can touch
them. However, holographic projection is still to achieve mass acceptance as until now,
conventional holograms, which offer 3D images.

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Fig.19. Example view of holographic Projection
Latest laser technology are also implementing the special technique of the screen less
display through the presence of the several 3D scope animation or the screen provides the
advantage of being combined with the Laser Valve Video Projector that helps in
projecting video images by the use of the laser light instead of the Xenon Arc lamps as
depicted in figure 8. Laser technologies have given an edge over the other technologies as
the LVP gives the projector an excellent depth in the focus.
Fig. 20. Virtual screens

25
Screen less display’s major working principle can also be implemented in the emerging
of the new screen less TV’s. Imagine that watching the TV picture that seems to be
magically appearing in the thin air. The picture just floats on in front of the viewer; this
would be a latest emerging technology in the future as depicted in figure 9.
Fig. 21. Magical display in air

26
6. ADVANTAGES AND DISADVANTAGES OF THE
TECHNOLOGY
6.1 ADVANTAGES:
1. Low power requirements- Only six diodes are required and afew of a watts to deliver
their images to the user’s eyes [3].
2. Higher resolution images- The pixels in the images projected by the diodes can be
made smaller than is possible with any CRT or flat panel display, so higher resolution can
be achieved. With retinal projectors, the only limitation in the resolution of visual images
will be the resolving power of the users’ eyes.
3. Greater portability- The combination of diodes, lenses, and processing components
in a retinal projector system will weigh only a few ounces.
4. Wider angle of view- Retinal projectors will be able to provide a wider field of view
than is possible with display screens.
5. More accurate color- By modulating light sources to vary the intensity of red, green,
and blue light, retinal projectors canprovide a wider range of colors – and more fully
saturated colors – than any other display technology.
6. Greater brightness and better contrast- Retinal projectors can provide higher levels
of contrast and brightness than any other display system.
7. Ability to present 3D images- With their capability of presenting high definition
image-pairs, retinal projectors can deliver the most highly realistic stereoscopic movies
and still pictorial images to their users.
8. Ability to present far-point images- The human visual system is a far-point system.
With today’s desktop and laptop computers users must employ their near-point vision.
The excessive use of our near-point vision in using computers, reading, sewing, playing
video games, etc., is making myopia a very common impediment. The use of the far-
point images that can be provided by retinal projector systems could reduce the incidence
of myopia and, hence, the growing need for and use of eyeglasses.
9. Lower costs- The present cost of retinal projector systems is high. Nevertheless, there
are no hard-to-overcome manufacturing problems in mass-producing and low-cost
components, so inexpensive systems will soon become available. Environmental and

27
disposal costs of these tiny delivery devices will also be minimal because toxic elements
such as lead, phosphorus, arsenic, cadmium, and mercury are not used in their
manufacture.
6.2 DISADVANTAGES:
1. The principle disadvantage is that Virtual retinal display (VRD) is not yet available in
the significant number.
2. Prototypes and special experimental models are now being built, but their cost per unit
is high.
3. The VRD technology is still under progress and Development.

28
7. FUTURE ENHANCEMENTS
For the future development of this emerging new technology, several researches are
being conducted and the several renowned IT sector companies and other best labs
present in the world are handling over the project of screenless displays.
Technology has become perhaps the greatest agent of change in the modern world. While
never without risk, positive technological breakthroughs promise innovative solutions to
the most pressing global challenges of our time, from resource scarcity to global
environmental change. However, a lack of appropriate investment, outdated regulatory
frameworks and gaps in public understanding prevent many promising technologies from
achieving their potential.
This field saw rapid progress in 2013 and appears set for imminent breakthroughs of
scalable deployment of screenless display. Various companies have made significant
breakthroughs in the field, including virtual reality headsets, bionic contact lenses, the
development of mobile phones for the elderly and partially blind people, and hologram-
like videos without the need for moving parts or glasses.
egan the work on an idea for an Interactive table that mixes both
the physical and the Virtual worlds.
Multi touch is a human computer interaction technique and the hardwire devices that
implement it, which allows users to compute without conventional input devices.
for the future use of the multi Touch use of the program.
cement of the micro vision also gives the improved and the
futuristic view of the screen less displays. This technology of the micro vision is the very
well useful in the Artificial Retinal Display properties.
nvented the pair of intelligent Glasses that remembers where
people last saw their keys, Handbags, iPod, and mobile phones.
loping the compact video camera which films everything the
wearer looks at the information what the viewer wants will be directly being seen in
through the glasses where there is no screen or projector present
e working under progress on the electron beam lithography
which includes the advanced enhancement of the futuristic screen less display.
working out for the development and deployment cross
platform of the several applications which are to be viewed without the actual screen.

29
8. CONCLUSION
The paper has elaborately discussed screenless displays which is one of the most
emerging computer technologies and has become a new exciting rage for the upcoming
generations as a field of the futuristic technology. Due to the ability of having several
advantages which are involved in the making, designing, coding of the screenless, this
needs plenty of knowledge and process for the development is still under the
improvement. May be in the future the world may be dominated with the screen less
display technologies and this enriches the world of technological empowerment in the
field of the computer technology. Screenless displays promises the cost effective aspect
and also brighter future in the computer technology.

30
9. REFERENCES
 http://www.wired.com/wiredscience/2010/11/holographic-video/#more-41098
 How Stuff Works, How Brain-Computer Interfaces Work
http://computer.howstuffworks.com/brain-computer-interface3.htm
 The Future of Things, Heliodisplay Floating Display
http://thefutureofthings.com/articles/40/heliodisplay-floating-display.html
 Kid’s Health, Your Eyes http://kidshealth.org/kid/htbw/eyes.html
 Holographic Projection Technologies of the Future
http://www.worldthinktank.net/pdfs/holographictechnologies.pdf
 http://en.wikipedia.org/wiki/Screenless
 https://www.google.com/patents/US6285505

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