In Brief : Touchscreen is a display which can detect the presence and location of a touch within the display area. 
The term generally refers to touch or contact to the display of the device by a finger or hand. Touchscreens can also sense other passive objects, such as a stylus.
However, if the object sensed is active, as with a light pen, the term touchscreen is generally not applicable.
The ability to interact directly with a display typically indicates the presence of a touchscreen.
Earlier, most consumer touchscreens could only sense one point of contact at a time, and few have had the capability to sense how hard one is touching. This is starting to change with the commercialisation of multi-touch technology.
The touchscreen has two main attributes :
First, it enables you to interact with what is displayed directly on the screen, where it is displayed, rather than indirectly with a mouse or touchpad.
Secondly, it lets one do so without requiring any intermediate device, again, such as a stylus that needs to be held in the hand.
Such displays can be attached to computers or, as terminals, to networks. They also play a prominent role in the design of digital appliances such as the personal digital assistant (PDA), satellite navigation devices and mobile phones.
Problem 1 : stress on human fingers.
Solution : Use fingernails as stylus.
Problem 2 : fingerprints on the display
Solution : use optical coating to prevent finger oils to stick.
Problem 3 : "Gorilla Arm" effect- Cramps in finger and arm.
The ability to interact directly with a display typically indicates the presence of a touchscreen.
Earlier, most consumer touchscreens could only sense one point of contact at a time, and few have had the capability to sense how hard one is touching. This is starting to change with the commercialisation of multi-touch technology.
The touchscreen has two main attributes :
First, it enables you to interact with what is displayed directly on the screen, where it is displayed, rather than indirectly with a mouse or touchpad.
Secondly, it lets one do so without requiring any intermediate device, again, such as a stylus that needs to be held in the hand.
Such displays can be attached to computers or, as terminals, to networks. They also play a prominent role in the design of digital appliances such as the personal digital assistant (PDA), satellite navigation devices and mobile phones.
Problem 1 : stress on human fingers.
Solution : Use fingernails as stylus.
Problem 2 : fingerprints on the display
Solution : use optical coating to prevent finger oils to stick.
Problem 3 : "Gorilla Arm" effect- Cramps in finger and arm.
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