All about Touchscreen Technology has been mentioned with special intention to meet seminar presentation.

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2. INTRODUCTIONINTRODUCTION

4.  Invented by E.A. Johnson (Royal RadarEst.)
around 1965 for air traffic control
 1993 Apple’s Newton and IBM’s Simon
 2002 Microsoft’s Windows XP Tablet
 2007 Apple’s iPhone (Multi-touch)
TheThe HP-150HP-150 from 1983 was probably the world'sfrom 1983 was probably the world's
earliest commercial touchscreen computer usingearliest commercial touchscreen computer using
infrared technology.infrared technology.
Now days, Multipoint touchscreen facilitates theNow days, Multipoint touchscreen facilitates the
tracking of more than one finger on the screen.tracking of more than one finger on the screen.
A Brief History

6.  A touch screen sensor is a clear glass panel with a touch responsive
surface over a display screen
 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 the touch to the screen.

7.  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
A small PC card
which translates
information that PC
can understand.

8.  The driver is a software that allows the touch screen and computer to
work together
 Most touch screen drivers today are a mouse-emulation type driver.
 It tells the computer's o.s how to interpret the touch event
information that is sent from the controller
Driver allows to
work with existing
software.

9. Diagram showing the working

10. 1.Resistive Touch Screen
• A resistiveA resistive
touchscreen panel istouchscreen panel is
composed of severalcomposed of several
layers.layers.
• It consists of a glassIt consists of a glass
that is coated withthat is coated with
electrically conductiveelectrically conductive
and resistive layers.and resistive layers.
Types of Touch screen
Technologies

11.  Composed of multiple layers separated by thin
spaces
 Using indium tin oxide (ITO) layers
 Different standards
4, 5, and 8 wire types
Each have advantages
 Advantages:
Cost-effective and low power Requirements
Activated by any object
Accurate
 Disadvantages:
Polyester surface can be damaged

Why Resistive?

12. 2.Capacitive Touch Screen
 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.
 Consists of:Consists of:
Insulator (glass or Air)Insulator (glass or Air)
Conductive coatingConductive coating
(ITO)(ITO)

13. 3.Surface Acoustic Wave Touchscreen
 Surface wave technology
uses ultrasonic wave that
passes over the touch
screen panel.
 Widely used in
application such as
computer based training
and information.

14.  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
 When finger touches screen it absorbs waves

15. 4.Infrared Touch Screen
 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.

16.  Uses infrared LEDs and matching photo
detectors
 Touching screen interrupts LEDs
 Cameras detect reflected LED caused by touch
 Controller able to calculate coordinates from
camera data

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

19. Direct pointing to the
objects.
Fast
Finger or pen is usable (No
cable required)
No keyboard necessary
Suited to: novices,
application for information
retrieval etc
Low precision by using
finger
User has to sit or stand
closer to the screen
The screen may be covered
more by using hand
No direct activation to the
selected function
Pros & Cons

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.
Touchscreens can suffer from the problem of fingerprints on the
display. This can be mitigated by the use of materials with
optical coatings designed to reduce the visible effects of
fingerprint oils, such as the oleophobic coating used in the
iPhone 3G, or by reducing skin contact by using a fingernail or
stylus.