T O U C H S C R E E N T E C H N O L O G Y © A J P

Touchscreen is an electronic visual display that the user can control through simple or multi-touch gestures by touching the screen with one or more fingers. Some touchscreens can also detect objects such as a stylus or ordinary or specially coated gloves. The user can use the touchscreen to react to what is displayed and to control how it is displayed (for example by zooming the text size)…………… TOUCH SCREEN © A J P

According to PC Magazine a touch screen is, "a display screen that is sensitive to the touch of a finger or stylus. Widely used on ATM machines, retail point-of-sale terminals, car navigation systems, medical monitors and industrial control panels, the touch screen became wildly popular on handhelds after Apple introduced the iPhone in © A J P

The touch screen is one of the easiest to use and most intuitive of all computer interfaces, a touch screen allows users to navigate a computer system by touching icons or links on the screen © A J P

--- Three components  The touch sensor is a panel with a touch responsive surface. Systems are built based on different types of sensors: resistive (most common), surface acoustic wave, and capacitive (most smart phones).  The controller converts the voltage changes on the sensor into signals of the computer Components Involved……. © A J P

 Software tells the computer, smartphone, game device, etc, what's happening on the sensor and the information coming from the controller. Who's touching what, where, and allows the computer or smart phone to react accordingly. © A J P

In 2002, Microsoft introduced the Windows XP Tablet edition and started its entry into touch technology. However, you could say that the increase in the popularity of touch screen smart phones defined the 2000s. In 2007, Apple introduced the king of smart phones, the iPhone, with nothing but touch screen technology. V/SV/S © A J P Microsoft - Apple

Types of Touch Screens…………..  Resistive touch screen  Capacitive touch screen  Surface acoustic touch screen © A J P

Resistive Touch screen This type of touch screen is made up of three sheets;  conductive  resistive  protective layer Advantages of Resistive Touch Screen  It has comparatively longer life.  It is used in many different ways.  It is a very common type of touch screen.  It is cheap and so approachable. Disadvantages of Resistive Touch Screen  It emits less light as 75 % so fails to give sharp image.  Its appearance is bulky. © A J P

Capacitive Touch Screen Advantages of Capactive Touch Screen  It emits 90% of light ray to make screen clear.  It has long life because of the resistivity Disadvantages of Capactive Touch Screen They are sensitive only for the fingers touch no other object like stylus can be sensed © A J P

Surface acoustic Wave Touch screen This is the more advanced types of touch screen. They are fast and have sharp image. In this touch screen three sheets are used to perform the action;  Sending transducer  Receiving transducer  Reflectors layer © A J P

Advantages of surface acoustic wave touch screen  Because of this wave mechanism versatile action can be done.  Being no electric field created, it emits 100% light resultantly quality image received. Disadvantages of surface acoustic wave touch screen  They tend to have very short life.  They are expensive so out of reach of a common man. They can be easily damaged © A J P

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Jaya Prakash © A J P