2. ABSTRACT
The touch screen is an assistive technology. This
interface can be beneficial to those that have
difficulty in using other input devices such as a
mouse or keyboard.
When used in conjunction with software such as
on-screen keyboards, or other assistive technology,
they can help make computing resources more
available to people that have difficulty in using
computers.
Touch screen based system allows an easy
navigation around a GUI based environment.
3. CONTENT
INTRODUCTION
TYPES OF TOUCH SCREEN
COMPONENTS
WORKING
ADVANTAGES AND DISADVANTAGES
APPLICATIONS
CONCLUSION
4. INTRODUCTION
What is a Touch Screen?
A touch screen is an Electronic Visual Display that
can detect the presence and location of a touch
within the display area.
OR
A touch screen is an Electronic Visual
Display that responds when it detects a
touch on its Surface
5. EVOLUTION OF TOUCH
SCREEN
The touch screen was derived from the
digitizing tablet. The digitizing tablet was
invented by Sam Hurst in 1971. It was
designed to allow scientists to record data
from graphs by placing the graph on the
tablet and pressing the paper against the
tablet with a stylus.
8. Resistive LCD touch screen monitors
rely on touch overlay, which is composed
of a flexible top layer and a rigid bottom
layer separated by insulating dots,
attached to a touch screen controller.
Resistive touch screen panels are
generally more affordable but offer only
75% clarity and the layer can be damaged
by sharp objects. Resistive touch screen
panels are not affected by outside
elements such as dust or water.
9. Resistive Touch Screen
Advantages:-
Low cost
High resistance to dust
Best used with finger ,stylus or gloved hand
Disadvantages:-
Not too sensitive
Poor contrast
Doesn’t support multi-touch
Phones:-
Samsung Star Duos, Samsung Champ Duos,
Spice FLO, Nokia C2-02, LG Cookie Joy
10. CAPACITIVE TOUCH SCREEN
A capacitive touch screen panel is
coated with a material that stores electrical
charges. When the panel is touched, a
small amount of charge is drawn to the
point of contact.
Capacitive touch screens have excellent
clarity, and there are no moving parts to
wear out. Liquids, dirt, grease, or other
contaminants do not affect them.
11. Capacitive Touch Screen
Advantages:-
Brighter and Sharper
High touch sensitive & doesn’t need stylus
Support multi-touch
Disadvantages:-
Expensive
Glass is more prone to breaking
Nokia Lumia 800, HTC Explorer, Apple iPhone
4S, Spice Mi-310, Samsung Galaxy Note
Phones:-
13. INFRARED TOUCH SCREEN
An infrared touch screen uses an array of X-Y
infrared LED and photo detector pairs around
the edges of the screen to detect a disruption in
the pattern of LED beams.
15. The Surface Acoustic Wave (SAW) technology is one of
the most advanced touch screen types. The technology is
based on two transducers (transmitting and receiving)
placed for the both of X and Y axis on the touch panel.
The Surface Acoustic Wave technology is
recommended for ATMs, Amusement Parks, Banking
and Financial Applications, public information kiosks,
computer based training, or other high traffic indoor
environments.
19. CONTROLLER [CAPACITIVE]
Name:
5000 RSU SERIAL
CONTROLLER
Supply Voltage:
+5 V DC or +12V
Touch Resolution
12bit, size independent.
20. SOFTWARE DRIVER
The driver is a software update for the PC system that
allows the touch screen and computer to work together.
It tells the computer's operating system, How to interpret
the touch event information that is sent from the
controller.
21. WORKING
Touch screens are activated by the insertion or removal
of the fingertip or by pressing the controls, active areas or
targets with a head stick, or other similar device (stylus).
Resistive touch screens are pressure sensitive, so they
can be operated with any input device, including a gloved
hand or stylus.
Capacitive touch screens offer higher clarity and are
more durable, but they do not respond to gloved hands or
most styluses.
Infrared touch screens are based on light-beam
interruption technology.
Surface Acoustic Wave (SAW) is a newer technology that
uses ultrasonic waves that pass over the screen.
22. ADVANTAGES
Touching a visual display of choices requires little
thinking and is a form of direct manipulation that is
easy to learn.
Touch screens are the fastest pointing devices.
Touch screens have easier hand eye coordination
than mice or keyboards.
No extra work space is required as with other
pointing devices.
23. DISADVANTAGES
User's hand may obscure the screen.
Some reduction in image brightness may occur.
They cost more than alternative devices.
24. APPLICATIONS
Public information displays
Tourism displays
Trade show display
Awareness kiosks
Customer self service
General departmental Stores
Restaurants
ATM
Airline ticket terminals
Other uses
Digital jukeboxes
Computerized gaming
Student Registration systems
