Touch screen technology allows users to interact directly with what is displayed on the screen by touching it with a finger or stylus. A touch screen includes a touch sensor panel, controller, and driver software. Touch screens were invented in the 1960s and work by detecting changes in signal or voltage at the location touched on the sensor. The main types are resistive, surface capacitive, projected capacitive, and infrared. Touch screens provide an intuitive interface and save space over physical buttons but can be harder to use in direct sunlight and get dirty. They are now widely used in devices, displays, self-service terminals and more.

1. TOUCH
SCREEN
TECHNOLOGY

2. Introduction
 A touch screen is electronic visual display that can
detect the presence & location of touch within the
display area.
 The display screen has a sensitive glass overlay
placed on it and we could give the desired input by
touching it.
 A touch screen kit includes a touch screen panel,
a controller and a software driver.

3. Brief History
 Invented by E.A. Johnson (Royal
Radar Est.) around 1965.
 In 1971 Dr. Samuel Hurst, founder
of Elographics developed the first
touch sensor “Elograph”.

5. Touch Sensor
 A touch screen sensor is a clear glass panel with a touch responsive
surface.
 The sensor generally has an electrical current or signal going through it and
touching the screen causes a voltage or signal change.
 This voltage change is used to determine the location of touch to the
screen.

6. Controller
 The controller is a small PC card that connects between the touch sensor and
the PC
 The controller determines what type of interface/connection you will need
on the PC

7. 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 a mouse-emulation
type driver. This makes touching the screen the same as
clicking your mouse at the same location on the screen.

8. Diagram showing How it Works

9. Working of touch screen in an
integrated circuit

10. * Resistive Touch Screen
* Capacitive Touch Screen
* Surface Acoustic Wave Touchscreen
* Infrared Touch Screen
Types of Touch Screen Technologies:

11. Resistive
Touch
Screen

13. Surface Capacitive Projected Capacitive

14. Surface Acoustic Wave
Touch screen

15. Infrared Touch
Screen

16. Resistive Infrared SAW Capacitive
Touch
Resolution
High High Average High
Clarity Average Good Good Good
Operation Finger or
Stylus
Finger or
Stylus
Finger or
Soft-tipped
Stylus
Finger only
Durability Can be
Damaged by
Sharp Objects
Highly
Durable
Susceptible
to Dirt and
Moisture
Highly durable

17. Advantages of all Touch Technology
 A touch screen is easy to use.
 Save space as no buttons are required.
 Touching a visual display of choices requires
little thinking and is a form of direct
manipulation that is easy to learn.
 Touch screens are the fastest pointing devices.
 Touch screens have easier hand eye coordination
than buttons.

18. Disadvantages
 Screen has to be really big not to miss things when
pressing them with finger.
 Big screen leads to low battery life.
 Touch screen means screen can’t be read too well
in direct sunlight as it applies an additional not
100% transparent.
 Touch screen devices usually has no additional
keys.
 Screens get very dirty.

19. Public Information Displays:
Tourism displays, Trade show display.
Customer Self-Services:
Stores, Restaurants, ATMs, Airline ticket terminals
and Transportation hubs.
More uses...
Smart Pjones,Computerized gaming, Student
Registration systems, Multimedia software ,
Scientific applications etc.

20. 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.

22. Any Questions ????