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Capacitive Touch Screen Technology

Capacitive Touch Screen Technology

capacitive-screen-stylus-on-tablet.jpgCapacitive Touch Screens are designed to respond to the electrical characteristics of the human finger. In more technical terms, an minute electrostatic field is created across the surface of the screen. When something begins to absorb that energy, it disrupts the field, a disruption that is picked up by sensors in various locations in or around the screen. These sensors then interpret the X-Y coordinates of the touch and communicate it to the device.

This type of touch screens is very responsive, which is why they are used in so many Smart Phones and other devices, however they do need a certain amount of surface area touched to respond. More particularly, they need a certain amount of electrostatic energy absorbed. This makes them somewhat of a challenge for users in many applications where the direct touch of a finger is not possible. It also creates major challenges for stylus makers who have to create special tips that can absorb the electrostatic charge in the same manner as a human finger.

Stylus Compatibility

Unlike "resistive" touch screens that work with almost anything, a "capacitive" touch screen requires a specialized stylus. That stylus must mimic the electrical properties of a human finger. This necessitates that it be made a certain size and/or of certain materials.

capacitive-stylus-tip.jpgTo determine if your device has a capacitive screen, the easiest test is to try a piece of plain smooth plastic, like a pen cap. If it doesn't work but your finger does, chances are it is a capacitive touch screen and requires a special stylus. The categories on our site for capacitive styluses include those for the iPhone, Droid, iPad and Tablets.

More Info on Capacitive Touch Screens

http://en.wikipedia.org/wiki/Capacitive_sensing

http://en.wikipedia.org/wiki/Touchscreen

 

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