2. Touch screen
The touch screen is a computer input
device
that works with the touch screen using a
finger or digital pen.
Touch-screen interface, where users operate
the computer system by touching a
picture or writing on the screen itself, is the
easiest way to operate a computer and are
increasingly used in various applications.
3. Components
Panel touch screen sensor
Located in exterior and generate electric current in place getting
touch
Touch screen controller
connective peripheral between panel sensor with peripheral of
computer to process the touch.
Driver software
translates the data into mouse movement,
enabling the sensor panel to function like a mouse,
5. Types of touch screen
Capacitive overlay
This type have strong endurance and also clear
appearance.
Guided acoustic wave
It works by transmitting acoustic waves through a layer
of glass is placed on the display screen.
Resistive overlay
Superior in durability, especially against the harsh
treatment and at an affordable price.
6. Infrared Scanning
In [screen/sail] frame there are overall light dioda and photo
transistor detecting the loss of light and transmit signals that
identify co-ordinate of x and y.
Near field imaging (NFI)
This type uses a tool or a sophisticated touch detection circuit
for detecting a touch
Surface acoustic wave
Works by sending acoustic waves through the glass panel that
is equipped with multiple transducers and reflectors.
7. Usage
Public information system
System of a restaurant or retail
Supermarket
Computer-based Training
8. Advantages
There is control and direct interaction between
the senses of sight and sense
of touch(input and output are on the same location)
The ability to enter and monitor data quickly
because of its use easy, is not required too much user
training to operate the touch screen system
Only valid options and likely to be accepted that can
be displayed
Easily accepted by users
No need for the user memory
9. Disadvantages
The amount of the cost of developing a touch
screen system as a technology recently
used in manufactured goods in bulk
Requires additional time in the process
of programming
Less flexible to some kind of specific input
Errors in the displayed image will cause an
error operation
Perceived fatigue due to repeated close to the screen
Fingers often covers the visual display screen
Need for new methods in programming the device fine