Shudhanshu Agarwal presented on touch screen technology to Mr. Abhishek Srivastava. The presentation covered the introduction, history, working process, technologies including resistive, infrared, capacitive and surface acoustic wave, applications in games, smartphones, ATMs and more, as well as advantages like durability and disadvantages like sensitivity. The conclusion discussed how touch screens are simplifying input and replacing keyboards and mice in the future.

1. Shri Ram Murti Smarak College of Engineering And
Technology, Bareilly
PRESENTATION TOPIC :TOUCH SCREEN TECHNOLOGY
PRESENTED TO:-
PRESENTED BY:-
MR. ABHISHEK SRIVASTAVA
SHUDHANSHU AGARWAL
B.TECH (EC-2011)
ROLL NO.-1101421102

2. Points of Discussion

Introduction

History

Working Process

Technologies

Applications

Advantages & Disadvantages

Conclusion

References

3.  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. However, if the
objects sensed is active, as with a
light pen.

4.  History:
In 1971 Dr. Sam Hurst, founder of Elographics developed the first
touch opaque sensor “Elograph” at the University of Kentucky.
 In 1974 He developed the first real touch screen.
 In 1977, Elographics developed the five-wire resistive technology
then with the backing of Siemens Corporation, developed a
curved glass sensor called the Touch screen.
 The new transparent technology, AccuTouch, was later developed
by the founders of Elographics, Dr. Hurst and Bill Colwell.
 Now days, Multipoint touchscreen facilitates the tracking of more
than one finger on the screen.


5.  How Does a Touchscreen Work?
1. Touch Sensor
2. Controller
3. Software Driver

6. 1. Touchsensor:

7. 2. 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.

8. 3. 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.

9.  Technologies:
1. Resistive
2. Infrared
3. Capacitive
4. Surface acoustic wave

10. 1.Resistive:

Two layers of conductive material

Touch creates contact between
resistive layers completing circuit

Voltage in circuit changes based on
position

Controller determines location
based on voltages

Any material can trigger sensors

11. 2.Infrared:

Uses infrared LEDs and matching
photodetectors

Touching screen interrupts LEDs

Cameras detect reflected LED
caused by touch

Controller able to calculate
coordinates from camera data

12. 3.Capacitive:

Glass panel with conductive layer
(Indium Tin Oxide)

Small amount of voltage applied to
four corners of touch screen

Touch draws minute
amount of current creating voltage
drop

Coordinates of point of contact
calculated by controller

13. 4. Surface acoustic wave:

Surface consists of glass overlay with
transmitting and receiving transducers

Electrical signals sent to the transmitting
transducers converts to ultrasonic waves

Waves are directed across screen by
reflectors then directed to receiving
transducers

Received values are compared to stored
digital maps to calculate x and y
coordinates

14.  Applications:

Many games use the touchscreens as a primary controlling device.
The popularity of smart phones, ATMs, and many types of
information appliances is driving the demand for touchscreens.
 Touchscreens are popular in heavy industry and in other situations,
such as museum displays or room automation.
 Casino and other gaming systems
 Computer access for the physically disabled
 Point-of-sale terminals
 Restaurant systems
 Employee time clocks


15.  Advantages:
► Mostly used in manufacturing and medical applications since it
can be completely sealed.
► Operated using a stylus or a gloved finger.
► Mechanically stronger
► Clearer
► More wear resistant
Disadvantages:
►It is very sensitive and can be activated by stray touches.
►Low resolution
►Parallax problems

16.  Conclusion:

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.

17.  References:
►
www.engineersgarage.com
►
www.nptel.iitk.ac.in
►
www.google.co.in
►
www.wikipedia.com
►
www.touchscreensolutions.com.au
►
www.norteng.com

18. NOW THE HOUSE IS OPEN FOR QUERIES.....
????
Thank You….