A touch screen is a computer display screen that is sensitive to human touch, allowing a user to interact with the computer by touching pictures or words on the screen. In 1971, the first "Touch Sensor" was developed by Doctor Sam Hurst (founder of Elographics) while he was an instructor at the University of Kentucky.

1. Indus Institute of
Technology &
Management,
Kanpur

2. TALK FLOW
INTRODUCTION
HISTORY
WORKING
DIFFRENT TOUCH SCREEN TECHNOLOGIES
PROS & CONS
APPLICATION
CONCLUSION
FEATURES OF TOUCH SCREEN

3. INTRODUCTION
A touch screen is a computer display screen that is
sensitive to human touch, allowing a user to interact
with the computer by touching pictures or words on
the screen.
A touch screen is an input device that allows users to
operate a PC by simply touching the display screen
which has a sensitive glass overlay placed on it .
A touch screen accepts direct onscreen inputs.

5. HISTORY
•Touch screens emerged from
academic and corporate research
labs
•In 1971, the first "Touch Sensor"
was developed by Doctor Sam
Hurst (founder of Elographics)
while he was an instructor at the
University of Kentucky.

6. HOW DOES A TOUCHSCREEN WORKS?
A basic touch screen has three main components:
 Touch sensor
 Controller
 Software driver

7. TOUCH SENSOR
The touch sensor is a clear glass
panel with a touch responsive area
and it is placed over the display
screen.
It allows the electric current and
signal to pass through it and change
in these signal is used to detect the
location of touch on the screen.

8. CONTROLLER
The controller is a small PC
card that connects between the
touch sensor and the PC.
It takes information from the
touch sensor and translates it
into information that PC can
understand.

9. SOFTWARE DRIVER
The driver is a software that allows the
touch screen and computer to work
together.
It tells the operating system how to
interpret the touch event information that
is sent from the controller.
Most touch screen drivers today are
mouse-emulation type drivers. This makes
touching the screen the same as clicking
your mouse at the same location on the
screen.

11. Diagram showing How it Works

12. •Resistive
•Capacitive
•Infrared
•Surface acoustic wave
•Optical Imaging
TECHNOLOGIES

13. ●The resistive touch screen uses a glass panel with a uniform conductive ITO(Indium Tin Oxide)
coating on the side surface.
●A PET film is a tightly suspended over the ITO coating surface of a glass panel.
RESISTIVE TOUCH SCREEN TECHNOLOGY

14. CAPACITIVE TOUCH SCREEN TECHNOLOGY
In the capacitive system, a layer that stores electrical charge is placed on the
glass panel.
When a user touches, some of the charge is transferred to the user, so the
charge on the capacitive layer decreases.
This decrease is measured in electrodes located at each corner of the monitor.
The computer then calculates the coordinates, from the relative differences in
charge at each corner.

17. •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.
INFRARED TOUCH SCREEN TECHNOLOGY

18. SURFACE WAVE TECHNOLOGY
•It has a transmitting and receiving transducers for both the X and
Y axes.
•The touchscreen controller sends a five-megahertz electrical signal to
the transmitting transducer, which converts the signal into
ultrasonic waves within the glass.
•These waves are directed across the front surface of the touchscreen
by an array of reflectors.

20. OPTICAL IMAGING
•In this two or more image sensors
are placed around the edges of the
screen. A touch shows up as a
shadow and each pair of cameras
can then be pinpointed to locate
the touch.

21. COMPARISON

23. Fast response
Error free input
Use finger , fingernail , gloved
hands , stylus or any soft tip pointer
Easy to clean
Does not interfere mouse and
keyboard
Make computing easy , powerful
and fun
It benefits children
Fingerprints
Finger stress
Screen has to be really big
not to miss things when pressing
them with your finger
big screen leads to low battery
life
touch screen means screen
can’t be read too well in direct
sunlight

24. Industrial
and Medical
instrumentati
on
Application
s

25. Though the touch screen technology contains some limitations it’s very
user friendly, fast, accurate, easy for the novices & fun to operate. It has
been widely accepted. And now by just modifying a little it can replace
the mouse and key board completely in near future
•Designers are trying to use touch screen to simplify input commands
•Today , touch screen has becomes adopted by computers users of all abilities because it
is simple, fast and innovative.
•In future there is no usage of mouse and keyboards as they will be replaced by touch
screen.