14-08-2014, 12:55 PM
HEAD UP DISPLAY
[attachment=66647]
ABSTRACT
A head-up display system projects an image directly onto the
human retina with low-energy lasers or LCDs. Head-up displays can
give the user ' the illusion of viewing a typical screen-sized display
hovering in the air several feet away. In principle the technology can
provide full-color, highresolution dynamic displays, but in practice the
components necessary to achieve the full potential of the technology
are either highly expensive. ; Although the technology was invented by
the University of Washington in the Human Interface Technology Lab
(HIT) in 1991, development did not begin until 1993; the technology
still needs much refinement and has only been commercialized in
specialized sectors of the display market such as automobile repair and
some parts of the militaryThe head-up display is highly efficient with respect to
power consumption, requiring far less power than the
postage-stamp LCD screens used commonly in today's Head up Display
Dept. ECE 2
mobile devices. A head-up display uses about a microwatt
of power. Since head-up display displays project images
directly onto the retina, they provide a sharp, clear image
regardless of external lighting conditions. Head-up displays
require a fraction of the hardware of conventional display
devices, allowing for lighter and more elegant mobile
devices, in high demand for today's electronics market.
Head-up display shows strong potential to replace LCD
screens in cell phones, handheld computers, handheld
gaming systems, and eventually even larger computers such
as laptops.
INTRODUCTION
Our window into the digital universe has long been a glowing
screen perched on a desk. It's called a computer monitor, and as we
stare at it, light is focused into a dime-sized image on the retina in the
back of our eyeball. The retina converts the light into signals that
percolate into your brain via the optic nerve.
PRINCIPLE
Head-up display have now become so compact and lightweight
that an emerging use is for displaying information to workers on site
locations such as power stations, airports and events. A new breed
monocular headup displays (HUD) cater for this application.
WORKING
There are just four primary components of a scanned-beam
display: electronics, light sources, scanners, and optics. Yet with a
modular approach, these simple elements can be combined to yield
many different products.
Electronics acquire and process signals from an image or data
source, such as a Web page or video camera. The processed signals
contain information for the intensity and mix of color that best
renders the intended image at each location that will be scanned, in
sequence. These values are the individual picture elements-pixels-that
make up the image. This information is stored in memory until
needed, when the data pass through a digital-to-analog converter that
controls the light source. Once the image has been rendered into
memory, there is no need to recalculate it unless something has
changed. The data can simply be replayed from memory, a feature
that can be exploited to cut costs or save power.
ADVANTAGES
The head-up display is highly efficient with respect to power
consumption, requiring far less power than the postage-stamp LCD
screens used commonly in today's mobile devices. A head-up display
uses about a microwatt of power. Since head-up display displays
project images directly onto the retina, they provide a sharp, clear
image regardless of external lighting conditions. Head-up displays
require a fraction of the hardware of conventional display devices,
allowing for lighter and more elegant mobile devices, in high demand
for today's electronics market. Head-up display shows strong potential
to replace LCD screens in cell phones, handheld computers, handheld
gaming systems, and eventually even larger computers such as laptops
CONCLUSION
As with most hi-tech electronics, head-up displays are set to
become smaller and lighter. MicroOptical is working towards a model
that will look no different to a normal pair of glasses. In the near
future, head-up displays will be available with wi-fi and Bluetooth
connectivity, allowing user's to surf the web and check their email on
the move.
There will also be devices that will create full colour images
that look bigger than a cinema screen, from a tiny head-mounted or
handheld device. This will open up applications such as augmented
vision and augmented reality.
Car dashboard information could be displayed by such a
display, allowing real-time information on the car, traffic and
directions, to be superimposed anywhere in the driver's field of view.
Mapping will take on a new leash of life with augmented reality
and GPS technology. Users will be able to see a map of their current
location displayed right on top of the real thing. This will aid
navigation in cities and the countryside, allowing street names to
appear on every road and virtual sign-posts to lead you to your
destination. Local information such as the nearest police or tube
station could be overlayed onto your view along with directions to the
nearest cash point or taxi rank.
[attachment=66647]
ABSTRACT
A head-up display system projects an image directly onto the
human retina with low-energy lasers or LCDs. Head-up displays can
give the user ' the illusion of viewing a typical screen-sized display
hovering in the air several feet away. In principle the technology can
provide full-color, highresolution dynamic displays, but in practice the
components necessary to achieve the full potential of the technology
are either highly expensive. ; Although the technology was invented by
the University of Washington in the Human Interface Technology Lab
(HIT) in 1991, development did not begin until 1993; the technology
still needs much refinement and has only been commercialized in
specialized sectors of the display market such as automobile repair and
some parts of the militaryThe head-up display is highly efficient with respect to
power consumption, requiring far less power than the
postage-stamp LCD screens used commonly in today's Head up Display
Dept. ECE 2
mobile devices. A head-up display uses about a microwatt
of power. Since head-up display displays project images
directly onto the retina, they provide a sharp, clear image
regardless of external lighting conditions. Head-up displays
require a fraction of the hardware of conventional display
devices, allowing for lighter and more elegant mobile
devices, in high demand for today's electronics market.
Head-up display shows strong potential to replace LCD
screens in cell phones, handheld computers, handheld
gaming systems, and eventually even larger computers such
as laptops.
INTRODUCTION
Our window into the digital universe has long been a glowing
screen perched on a desk. It's called a computer monitor, and as we
stare at it, light is focused into a dime-sized image on the retina in the
back of our eyeball. The retina converts the light into signals that
percolate into your brain via the optic nerve.
PRINCIPLE
Head-up display have now become so compact and lightweight
that an emerging use is for displaying information to workers on site
locations such as power stations, airports and events. A new breed
monocular headup displays (HUD) cater for this application.
WORKING
There are just four primary components of a scanned-beam
display: electronics, light sources, scanners, and optics. Yet with a
modular approach, these simple elements can be combined to yield
many different products.
Electronics acquire and process signals from an image or data
source, such as a Web page or video camera. The processed signals
contain information for the intensity and mix of color that best
renders the intended image at each location that will be scanned, in
sequence. These values are the individual picture elements-pixels-that
make up the image. This information is stored in memory until
needed, when the data pass through a digital-to-analog converter that
controls the light source. Once the image has been rendered into
memory, there is no need to recalculate it unless something has
changed. The data can simply be replayed from memory, a feature
that can be exploited to cut costs or save power.
ADVANTAGES
The head-up display is highly efficient with respect to power
consumption, requiring far less power than the postage-stamp LCD
screens used commonly in today's mobile devices. A head-up display
uses about a microwatt of power. Since head-up display displays
project images directly onto the retina, they provide a sharp, clear
image regardless of external lighting conditions. Head-up displays
require a fraction of the hardware of conventional display devices,
allowing for lighter and more elegant mobile devices, in high demand
for today's electronics market. Head-up display shows strong potential
to replace LCD screens in cell phones, handheld computers, handheld
gaming systems, and eventually even larger computers such as laptops
CONCLUSION
As with most hi-tech electronics, head-up displays are set to
become smaller and lighter. MicroOptical is working towards a model
that will look no different to a normal pair of glasses. In the near
future, head-up displays will be available with wi-fi and Bluetooth
connectivity, allowing user's to surf the web and check their email on
the move.
There will also be devices that will create full colour images
that look bigger than a cinema screen, from a tiny head-mounted or
handheld device. This will open up applications such as augmented
vision and augmented reality.
Car dashboard information could be displayed by such a
display, allowing real-time information on the car, traffic and
directions, to be superimposed anywhere in the driver's field of view.
Mapping will take on a new leash of life with augmented reality
and GPS technology. Users will be able to see a map of their current
location displayed right on top of the real thing. This will aid
navigation in cities and the countryside, allowing street names to
appear on every road and virtual sign-posts to lead you to your
destination. Local information such as the nearest police or tube
station could be overlayed onto your view along with directions to the
nearest cash point or taxi rank.