Whether you like it or not Touch-phones are here to stay. Who needs buttons? You touch to send an email; you touch to message your buddies ; you even touch to pump nitro into your NFS car;
when you can do so much through touch who needs buttons?
But what really happens when your fingers makes contact with the screen? Magic? nah, in that case Cris Angel would have unveiled the iPhone rather than Steve Jobs 😀
Well latest screens are equipped with touch sensing technology.
Basically all pinpoint the movement of your finger but in a different manner.
There are two broad types of touch screens – 1) Resistive 2) Capacitive.
Resistive screens are the earliest of the technologies to be incorporated in the mobile phones. They consist of two metallic electrically conductive layers separated by a small gap. When we touch the two layers join to allow current to flow through. The amount of current flowing gives the position of the pointed finger.
Well this is really cool , everyone wanted it back in 2000’s , well not everyone want this now. The reason:Capacitive Touch-Screens!!!

Capacitive screens are a little complex and advanced to the resistive screens. Capacitive Screens consist of a protective layer, a glass substrate and between these layers there are couple of layers which contain the electrodes (self-capacitance) or Capacitors (mutual capacitance).
The Self-Capacitance screens have electrodes, instead of capacitors, which are arranged in X-Y grid manner. These screens are not so accurate as the ones which use mutual capacitance.
Mutual capacitance has capacitors placed at every junction. While current is passed through horizontal lines , voltage is measured on the vertical lines. When we touch the screen the difference in the voltages at each intersection gives the exact position of the finger. This also allows us to implement the Multi-Touch feature. Multi-Touch allows us to use two fingers to interact with the phone.You can zoom in/out of pictures(web pages) by “pinching ” the screen.
Mutual Capacitance based screens have high accuracy and can sense the slightest of touch action by the user. The responsiveness of the screens is high for mutual capacitance based screens while the durability and stability of the screens belongs to Resistive Types screens.
Now to the question of which screen suits you?? well the answer is simple : Try all the options available and then choose. First try.
Some people feel capacitive screens are all crap because it is too sensitive but kinda like the resistive screens .
However the capacitive screens are the most popular these days.

About Rahul Vittal

Believes that all that happens for the good. If not , you have to make it good.

One response to “>Touch!!”

  1. raveesh says :


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