This document discusses touch screens, including their history, functions, types, and uses. It provides background on the invention of touch screens in the 1970s and describes the three main types: resistive, capacitive, and infrared. Resistive touch screens use two layers that create contact when pressure is applied. Capacitive screens are more durable and work with a wide range of pressures. Infrared screens are most accurate but have lower resolution. The document concludes touch screens are now commonly used for public displays and customer self-service interfaces.

1. Sunil dahal
Bsc IT 1Sem (D)
123151725

2. Introduction
History
Functions
Working
Types
USES
Conclusion

3. INTRODUCTION
 A touch screen is a display that can detect the presence and
location of a touch within the display area.
 Touch screen can also sense other passive objects such as
stylus.
 A touch screen accepts direct
onscreen inputs.
 A touch screen is an input device that allows users to
operate a PC by simply touching the display screen
which has a sensitive glass overlay placed on it.

4.  According to the Google “Touch Sensor was developed by
Dr. Sam Hurst (founder of Elographic) in 1971”.
 Touch screens emerged from academic and corporate
research labs,
 In 1974, the first true touch screen was lunch.

5.  Pressure sensitive activation-by finger or stylus.
Touch screen & mouse can be used concurrently
 Emulates mouse function –click, double click, & drag.

6. A basic touch Screen has three main components:
 Touch Sensor
A touch screen sensor is a clear glass panel with a touch responsive surface
which is place over a display screen
 Controller
It is a small PC card which connects between the touch sensor and the PC.
 Software Driver
The driver is a software that allows the touch screen and computer to work
together

7. TYPES
Manly there are three (3) types of touch screen.
 There are two layers which have a small gap in between and when you apply
pressure to the screen a contact is created by the top layer touching the
bottom layer
 Not sensitive
 Example of Resistive
LG Otimus, Nokia 900 etc.
 It has a constant voltage and when the glass front of the
touch screen is touched it creates an electrostatic field and
screen reacts by sending the information to the touch controller
 Capacitive touch screens provide a high-quality
control experience, because they work with a wide
range of finger pressure, and are sensitive to
multi-touch inputs.
 More durable then resistive

8. Example of Capacitive
Apple iphone, Samsung Galaxy etc.
 It works with small infra red LED’ s mounted around the outer
edges of the glass front and basically divides the surface of the
screen into small squares, making it extremely accurate. You
can also use a stylus or have gloves on to make this work as it
does not require a conductor, your finger, to make it work.
 Highest quality of underlying image.
 Very high durability and reliability.
 Lower resolution than other technologies.

9.  Public Information Display
Tourism Displays, Trade Show Display.
 Customer Self-Service
Store, Restaurants, Transportation, Atm etc

10.  Touch screen, touch panels or touch screen panels are display overlays which have
the ability to display and receive information on the same screen
 Touch screen also have assisted in recent change in the PDAs, making these
devices more usable.