Touch screen(ppt)

A SEMINAR
ON
TOUCH SCREEN
Presented
By

TAUPHIK AHAMAD
B.TECH ( 3rd year) (1002810094)

DEPARTMENT OF COMPUTER SCIENCE & ENGINEERING
IDEAL INSTITUTE OF TECHNOLOGY,GHAZIABAD
(INDIA)
(1012-13)

What is Touchscreen ?

A display which can detect the presence and
location of a touch within the display area.

INTRODUCTION
 In 1974, the first touch screen developed by
Sam Hurst and Elographics.

 The HP-150 from 1983 was probably the
world's earliest commercial touchscreen
computer.

 Now days, Multipoint touchscreen facilitates
the tracking of more than one finger on the
screen.

How Does a
Touchscreen Work?

1. Touch Sensor

2. Controller

3. Software Driver

2. Controller

A small PC card
which translates
information that PC
can understand.

3. Software Driver

Driver allows to
work with existing
software.

Technologies

1. Resistive

2. Infrared

3. Capacitive

4. Surface acoustic wave

1.Resistive
• A resistive
touchscreen panel is
composed of several
layers.
• It consists of a glass
that is coated with
electrically
conductive and
resistive layers.

Advantages of resistive touch
screen technology…..
Lower cost.
Can operate with any pointing devices
like stylus and nail.
Good for hand writing recognition
system.
Resistive touch screen is not effected
by any elements such as dust or water.

Disadvantages of resistive touch
screen technology….
 Can be relatively easily damaged by
scratching.
 Can be relatively easily damaged by
impact.
 It emits only 75% of light which make
the image relatively bulky and dim.

[2. Infrared ]
 The new generation
IR touchscreen LCD
has been increased
brightness, clarity and
durability.
Touched with a finger,
gloved hand,
fingernail, or stylus, it
delivers a fast,
accurate response
every time.

Advantages of infrared touch

Best image quality.
Almost all kind of stylus materials can be
used.
High stability, change in time and
environment will not effect.
IR having no intermediate touch overlay
so it transmit 100% light.
It used in ATMs, plasma TV, Hospital
operation room etc.

Disadvantages of infrared touch

High pressure may causes unwanted
target selection.
 Infrared touch screen having low
resolution.

3. Capacitive
It consist of a glass panel
with capacitive (charge
storing) material coating
on its surface.
Circuits located at the
corners of the screen
measure capacitance of a
person touching the
overlay.

Advantages of capacitive touch

 Visibilityof the capacitive touch screen is
good even in sunlight.
Highly sensitive to finger touch leading to
easy to use.
Highly transmissivity transmit more than 85%
of light .
Capacitive touch screen can also implement
multi touch gesture.
This technology is used in smart phones (e.g.
Apple iPhones , HTC mobiles and Samsung )

Disadvantages of capacitive
touch screen technology…..

Can not be used with gloved hand and
stylus.
 need to have at least 5% humidity to
achieve capacitive effect .
Capacitive touch screen is more
expensive.

4.Surface acoustic wave
Surface wave technology
uses ultrasonic wave that
passes over the touch
screen panel.
Widely used in
application such as
computer based training
and information.

Advantages of SAW touch

 High Resolution.
SAW technology provides superior
image clarity.
Highly transmissivity transmit more
than 92% of light .
It has excellent durability that allow it to
continue working if scratched.
This technology is used in ATMs, Banking
and Financial applications.

Disadvantages of SAW touch

It must be touched by finger, gloved
hand and soft stylus, something hard
like a pen, credit card or finger nail
won’t work.
 Relatively expansive in comparison
to other technologies .

Applications
 Many games use the touchscreens as a primary controlling
device.

 Touchscreens becomes familiar in kiosk systems (retail
and tourist settings).

 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.

References
1. www.google.co.in
2. www.wikipedia.com
3. www.touchscreensolutions.com.au
4. www.norteng.com

Touch screen(ppt)

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