By: Kem Okonkwo
Visual Display: Visualization is any
technique for creating images, diagrams or
animation to communicate a message.
Visualization through visual imagery has
been an effect way to communicate both
abstract and concrete ideas.
Early known European
cave paintings date to
32,000 years ago.
Purpose of cave painting
is not known.
Theories describe cave
painting as a way of
and for religious and
Formal writing system
used by the ancient
Circa 3200 BC,
Examples of Visual Display Today
Examples include screens on ATMs, ticket
vending machines and information kiosks,
and information displays in stations and
Others include: Plasma, LCD, digital
camera, traffic lights and much more.
Imagine Graphics (UK) Airport Flight
Air Traffic Control Tower Display
Features of LCD TV
1366 x 768 resolution.
1000:1 contrast ratio
HDMI, Component video and VGA inputs.
Some come with 2 or more built in
Advantage of LCD
No burn-in of static images.
Cooler running temperature.
Increased image brightness.
Longer display life (60,000 hrs)
Disadvantage of LCD
Lower contrast ratio.
Not as good at tracking motion.
Not as common in larger screen sizes
Plasma Television: The very first prototype
for a plasma display monitor was invented
in 1964 by Donald Bitzer, Gene Slottow,
and Robert Willson.
Features of a Plasma TV.
1365 x 768 resolution.
8000:1 contrast ratio.
1000 cd/m2 brightness.
Advantages of a Plasma TV
Larger screen size availability.
Better contrast ratio.
Better color accuracy.
Better motion tracking.
Disadvantage of a Plasma TV
More susceptible to burn-in if static
Generate more heat.
Do not perform as well at higher altitude .
Shorter display life span (30,000 hrs)
The very first traffic light was a revolving
gas lantern with red and green lights
installed in a London intersection in 1868.
A later version of the traffic light based on
railroad signals was installed in Detroit,
Michigan, in 1920.
Garrett Augustus Morgan to thank for
the modern version and first patent of this
Format of Display Text
Legibility: Text should be displayed using high
contrast color combinations.
Blocks: showing blocks of text on an information
board for a few second is much easier to read
Size: Adjustment of size is necessary, with good
proportion with clear character shape.
No Flicker: Add-on assistive devices shouldn’t
cause screen to flicker with a frequency > than 2
Hz and lower than 55 Hz.
Navigating the Machine
Visual instructions on the screen are the
main guide for the user.
Choice of pictograms and icons should be
The moving components should be
compatible with the direction of movement
that occurs naturally e.g. 'up' results in an
upward movement and increase in
Use of Color
Often used to highlight or code
information. No more than five colors
should be used in any display.
Bright colors can produce glare, which
might distract the user and cause the eyes
to become tired.
Color Blindness is more common in males
than in females. Therefore excessive use
of color can also be distracting.