Abstract :
Touchscreen technology is the direct
manipulation type gesture based technology. Direct manipulation is the ability to manipulate digital world
inside a screen without the use of command-line-commands.
A device which works on touchscreen
technology is coined as Touchscreen. A touchscreen is an electronic visual
display capable of ‘detecting’ and effectively ‘locating’ a touch over its display
area.
It is sensitive to the touch of a human
finger, hand, pointed finger nail and passive objects like stylus. Users can
simply move things on the screen, scroll them, make them bigger and many more.
An ergonomic problem of touchscreens is
their stress on human fingers when used for more than a few minutes at a time,
since significant pressure can be required for certain types of touchscreen.
This can be alleviated for some users with the use of a pen or other device to add
leverage and more accurate pointing. The introduction of such items can
sometimes be problematic, depending on the desired use (e.g., public kiosks
such as A.T.M.s). Also, fine motor control is better achieved with a stylus, because a finger is a rather broad
and ambiguous point of contact with the screen itself.
HOWDOES A TOUCHSCREENWORK?
A basic touchscreen has three main
components: a touch sensor, a controller, and a software driver. The
touchscreen is an input device, so it needs to be combined with a display and a PC or other device
to make a complete touch input system.
TouchSensor
A touch screen sensor is a clear glass
panel with a touch responsive surface. The touch sensor/panel is placed over a
display screen so that the responsive area of the panel covers the viewable area of the video
screen. There are several different touch sensor technologies on the market
today, each using a different method to detect touch input.
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.
Controller
The controller is a small PC card that
connects between the touch sensor and the PC. It takes information from the touch sensor and
translates it into information that PC can understand. The controller is
usually installed inside the monitor for integrated monitors or it is housed in
a plastic case Tor external touch add¬ons/overlays.
The controller determines what type of
interface/connection you will need on the PC. Integrated touch monitors will
have an extra cable connection on the back for the touchscreen. Controllers are
available that can connect to a Serial/COM port (PC) or to a USB port (PC or
Macintosh). Specialized controllers are also available that work with DVD
players and other devices.
Software Driver
The driver is a software update for the
PC system that allows the touchscreen 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.
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. This allows the touchscreen to work with existing
software and allows new applications to be developed without the need for
touchscreen specific programming.
Some equipment such as thin client terminals, DVD players, and specialized computer systems either do not use software drivers or they have their own built-in touch screen driver.
Some equipment such as thin client terminals, DVD players, and specialized computer systems either do not use software drivers or they have their own built-in touch screen driver.
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