Too easy to understand and so useful knowledge. Go ahead

1. Presentation on
“Touchscreen”
B.C.A SEMESTER 2nd
CIMS College
Presented By:
1. Lucky Verma
2. Atiuttam Panday
3. Mohd. Saif
4. Saraswati Maurya

2. 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 object sensed is active, as with a light pen.
Apple was the first with a touch screen
phone in 1983. Jason Ford of Elo Touch
Systems, the company whose founder
invented touch screen technology, for
providing the touch technology. In 1971,
the first "touch sensor" was developed
by Doctor Sam Hurst.
First Touch Phone
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. It is
Nokia's first, and so far only smart phone
to run the Series 90 GUI a top the Simian
OS.
First Touch Mobile

3. History & Development
 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

4. Touchscreen Technologies
There are mainly 4 types of touch Technologies:-
1.Resistive
2. Surface acoustic wave
3. Capacitive
4. Infrared

5. Resistive Touchscreen
A resistive touch screen panel is
composed of several layers, the
most important of which 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
become connected 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 and Retail Stores.

6. Advantages & Disadvantages of
Resistive
 Advantages
 Cost-effective solution
 Activated by any stylus
 Very accurate
 Low power requirements
 Liquids won't affect touch screen performance
 Disadvantages
 Polyester surface can be damaged
 Lower endurance (35 million touches)

7. Capacitive Touchscreen
 A capacitive touch screen panel
consists 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 change
in capacitance.

8. 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

9. 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 the position of the touch
event and sends this information to
the controller for processing. SAW
touch screen technology is
suggested for use in ATMs,
Amusement Parks, Gaming
Environments, Industrial Control
Rooms etc.

10. Advantages & Disadvantages of
Surface Acoustic Wave
 Advantages
 Durable glass construction
 High optical clarity
 Activated by a finger, gloved hand, or soft tip stylus
 Disadvantages
 Moving liquids or condensation can cause false touches
 Solid contaminants create non-touch areas until
removed
 Doesn't support drag or draw effectively

11. Infrared Touchscreen
 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. Infra-red bezels
have proven to be a very
reliable technology for use in
ATMs, Medical
Instrumentation and
Transportation Tracking
applications.

12. Advantages & Disadvantages of
Infrared Touch Screen
 Advantages
-Highest quality of underlying image
-Very high transmittance
-Excellent anti-glare, with use of chemically etched glass
-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.
– Low resolution
– Parallax problems

13. CLOSING THOUGHTS
 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.