Touch screen technology allows users to operate devices by touching the display screen. It has evolved from early resistive touch screens in the 1970s to modern capacitive touch screens. There are four main types of touch screen technologies: resistive, capacitive, infrared, and surface acoustic wave. Each technology works differently but all allow the device to detect touch locations on the screen. Touch screens are now widely used in devices like smartphones, tablets, and public information displays due to their intuitive, hands-on interaction.

1. Touch Screen Technology
Represented By-
Md Raghib Ansari
ECE124032
Aliah University

2.  INTRODUCTION
 HISTORY
 WORKING
 TECHNOLOGIES
 APPLICATION
 CONCLUSION
OVERVIEW

3. Introduction
What Is a Touch Screen?
A Touch Screen IS An
Input Device
That Allows Users To
Operate a P.C
By Simply Touching
The Display
Screen Which Has A
Sensitive Glass
Overlay Placed On It.

4. HISTORY
 In 1971,Dr Sam Hurst
developed the first touch
opaque sensor named
elograph.
 In 1974 he developed first
real touch screen.
 The HP-150 from 1983
was probably the world’s
earliest commercial touch
screen computer.

5. HOW DOES A TOUCH SCREEN
WORK
HOW DOES A
TOUCH SCREEN
WORK

6. 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.

7.  The controller connects between the touch sensor and
the PC
 Take information from the touch sensor and translate it
into information that PC can understand.
CONTROLLER

8.  The driver is a
software 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.
SOFTWARE DRIVER

9.  Resistive.
 Capacitive.
 Infrared.
 Surface Acoustic
Wave.
TECHNOLOGIES

10. RESISTIVE
A resistive
touchscreen panel
is composed of
several layers.
It consists of a
glass that is coated
with electrically
conductive and
resistive layers.

11. Advantages & Disadvantage of
Resistive Touch Screen
• Lower Cost.
• Good For Hand Writing
Recognition
• Can be relatively easily
damaged by
scratching.
• It emits only 75% of
light which make the
image relatively bulky
and dim
Advantages  Disadvantages

12.  It consist of 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.
CAPACITIVE

13. Advantages &Disadvantages Of Capacitive
touch screen technology…
Visibility of
capacitive touch
screen is good even
in sunlight.
Highly sensitive to
finger touch leading
to easy use.
Highly
transmissivity,it
transmit more than
85% of light.
It is expensive.
Can not be used
with gloved hand
and stylus.
Need to have at
least 5% humidity to
achieve capacitive
effect
 Avantages  Disadvantages

14. The 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

15. Advantages & Disadvantages of Infrared
touch screen technology…
 Best image quality.
 Almost all kind of
stylus materials can be
used.
 High stability, change
in time and
environment will not
effect.
 High pressure may
causes unwanted
target selection.
 Infrared touch screen
has low resolution.
 Advantages  Disadvantages

16.  Surface wave technology
uses ultrasonic wave that
passes over the touch
screen panel.
 Widely used in application
such as computer based
training and information.
SURFACE ACOUSTIC
WAVE

17. Advantages & Disadvantages of SAW
touch screen technology…
High resolution.
SAW technology
provides superior
image quality.
Highly
transmissivity
transmit more than
92% of light.
Relatively expansive
in comparison to
other technology.
It must be touched
by finger, gloved
hand and soft stylus,
something hard like
a pen, credit card or
finger nail won’t
work.
 Advantages  Disadvantages

18. Applications
Industrial and
Medical
instrumentatio
n

19. Designers are trying to use touch screen to simplify
inputs commands.
Today, touch screen has become adopted by
computers users of all abilities because it is simple,
fast and innovative.
RPO’ s Digital Waveguide Touch.
 3-dimensional Touchscreens.
CONCLUSION & Future Scope

20. Thank You