p touchtechnology 111228093448 phpapp02
TRANSCRIPT
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PRESENTATION ON TOUCH TECHNOLOGY
IN MOBILES
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Introduction
A touch screen is an electronic visual
display that can detect the presence
and location of a touch within the
display area. Touch screens can sense
Finger and other passive objects, such
as a stylus.
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Dr. Samuel Hurst
The father of the touch screen technology
is Dr. Samuel Hurst. In 1971, while he was
working as an instructor at the University of
Kentucky Research Foundation, he had to
read a great volume of information duringthe graduation exams. In an effort to save
some time he invented the first touch sensor
that he called lo graph(electronic
graphics), which allowed him to enter datafaster.
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First Touch Phone
Apple was the first with a touchscreen phone in 1983. JasonFord of Elo Touch Systems, thecompany whose founderinvented touch screentechnology, for providing thetouch technology. In 1971, thefirst "touch sensor" wasdeveloped by Doctor SamHurst.
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First Touch Mobile
The Nokia 7710 is a first touch
screen mobile phone model
produced by Nokia. The 7710 is
based on the Nokia 7700 which
was never released.
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Construction of Touch screen
A basic touch screen has threemain components: a touch
sensor, a controller, and a
software driver. The touch
screen is an input device, so itneeds to be combined with a
display and a PC or other
device to make a complete
touch input system.
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Touch Sensor
A touch screen sensor is a clear glass panel with a touchresponsive surface which is placed over a display screen so thatthe responsive area of the panel covers the viewable area of thedisplay screen.
The sensor generally has an electrical current or signal goingthrough it and touching the screen causes a voltage or signalchange. This voltage change is used to determine the location
of the touch to the screen
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TOUCH SENSORS
Touchsensor
Covering screen
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Controller
The controller is a small PC cardthat connects between the touch
sensor and the PC. It takes
information from the touch sensor
and translates it into informationthat PC can understand.
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Types of Touch Technologies
There are mainly 4 types of touch Technologies:-
1.Resistive
2. Surface acoustic wave
3. Capacitive
4. Infrared
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Resistive
A resistive touch screen panel is composed
of several layers, the most important ofwhich are two thin, metallic, electrically
conductive layers separated by a narrow
gap. When an object, such as a finger,
presses down on a point on the panel's outer
surface the two metallic layers becomeconnected at that point. This causes a
change in the electrical current, which is
registered as a touch event and sent to
the controller for processing. It is used
in Grocery Stores, Hotels, Restaurants andRetail Stores.
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Surface Acoustic Wave (SAW)
Surface acoustic wave (SAW)
technology uses ultrasonic waves that
pass over the touch screen panel.
When the panel is touched, a portion
of the wave is absorbed. This change
in the ultrasonic waves registers theposition of the touch event and sends
this information to the controller for
processing. SAW touch screen
technology is suggested for use inATMs, Amusement Parks, Gaming
Environments, Industrial Control
Rooms etc.
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Advantages & Disadvantages of SAW
Advantages
High optical clarity
Activated by a finger, gloved hand, or soft tip stylus
Disadvantages Solid contaminants create non-touch areas until removed
Doesn't support drag or draw effectively
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Capacitive
A capacitive touch screen panelconsists of an insulator such
as glass, coated with a
transparent conductor such
as indium tin oxide (ITO). As the
human body is also a conductor,
touching the surface of the screen
results in a distortion of the
body's electrostatic field,
measurable as a changein capacitance.
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Advantages & Disadvantages of Capacitive
Advantages
Scratch resistant, durable surface
High endurance (225 million touches)
Very accurate Good optical clarity
Liquids won't affect touch screen performance
Disadvantages
Does not work with gloved fingers or stylus
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Advantages & Disadvantages of Infrared Touch
Screen
Advantages-Highest quality of underlying image
-Can be activated with almost any device
-Higher accuracy than other technologies
-Very high durability and reliability
Disadvantages
- Surface obstructions can cause a false touch
It is very sensitive and can be activated by stray touches.
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Touch Screen Technology Comparison Chart
Resistive Infrared SAW Capacitive
Touch Resolution High High Average High
Clarity Average Good Good Good
Operation Finger or Stylus Finger or Stylus Finger or Soft-
tipped Stylus
Finger only
Durability Can be Damaged
by Sharp Objects
Highly Durable Susceptible to
Dirt and
Moisture
Highly durable
M lti T h
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Multi Touch
Fl ti T h
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Floating Touch
Sony Xperia sola
Self capacitance"ghosting" (the redcrosses) occurs when youplace two fingers on the
screen. The phone can'tdetermine the exactposition of the fingers andinstead detects fourinstead of two contactpoints.
http://www.phonearena.com/phones/Sony-Xperia-sola_id6814http://www.phonearena.com/phones/Sony-Xperia-sola_id6814http://www.phonearena.com/phones/Sony-Xperia-sola_id6814http://www.phonearena.com/phones/Sony-Xperia-sola_id6814http://www.phonearena.com/phones/Sony-Xperia-sola_id6814 -
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Prepared by:
Lokesh Chawla