Tablet PCs have registered their presence in the market today. The demand for them is increasing with each passing day and more and more people are incorporating the use of this sleek and stylish PC in their day to day work. The portable quality and the incorporation of the touch screen technology is innovative and new, and that is why more and more people are attracted towards it.

The use of the digital pen (stylus) and the finger of the user, instead of the keyboard is a new technology that has been introduced in the tablet PC that makes it more user friendly. This is made possible with the help of the digitizer that is mostly installed behind the screen of the PC. This device senses the finger or the digital pen on the screen and interprets the action that it wishes to perform.

There are various types of digitizers that are available for tablet PCs.

1.Active Digitizer: This type is used in maximum number of tablet PCs. It can sense the position of the pen when it is close proximity to the screen. The pen does not even need to touch the screen for viewing drop down or hidden menus. It does not record the movement of the hand on the screen.


2.Passive Digitizer: This digitizer is used in touch screen tablet PCs, where the user uses his fingers to navigate on the computer. It can sense the user's finger only after it is pressed down on the screen. They come in two types capacitative and resistive. The capacitative type requires direct skin touch, while the resistive type can be operated by a stylus as well as a gloved hand.


3.Hybrid Digitizers: In this type, both the finger as well as the stylus can be used for navigation across the computer screen of the tablet PC.


4.Stroking Pen: This type doubles up as a normal pen as well as a stylus. The user can affix a piece of paper on top of the tablet PC screen, and write normally on the paper. Whatever he writes on the paper gets converted into digital impressions and transfers onto the screen automatically. This way the user can have dual copies of all documents, one on paper and the other on the computer.