How Does TouchScreen Of Mobile Phone Work ?

Every kind of touchscreens whether its of mobile phone or tablets or even touchscreen of desktop screens runs on same principle described below in a very simpler manner.

Older technology

In older times the touch screen used a thin layer of flexible polyster film attached over a coat of glass or plastic. Other coatingssuch as criss-crossed or indistinguishable wires are also used in place of it.

Now when top layer is pressed over the lower layer with the help of a finger or its stylus, these invisible wires get intersect with each other thus will interrupt the flow current resulting change in directoion which helps the device in deciding where is the touch located on screen. Here, a minimum amount of touch needs to applied to observe the result

In such older kind of touch screen technology, the sensitivity gets decreasing towards the edges due to out-dated technology but nowadays capacitive touchscreens are available which uses its smart technology so that the sensitivity of the touch screen remains constant & uniform throught the screen.

Newer Technology

In this technology, a capacitive film is place over the main screen, holds current which is purposely flown for this technology. Now when this film is touched by finger or stylus, this reduces the amount of current flowing at the contact point of screen.

Now as we know that there is nothing like invisible wires pressed hence, due to the capacitive screen can locate the contact point sensitively such that it is uniform throught the screen with a slightest touch.

Signals travel from the touch screen to the processor as electrical impulses.

The processor uses software to analyze the data and determine the features of each touch. This includes size, shape and location of the affected area on the screen. If necessary, the processor arranges touches with similar features into groups. If you move your finger, the processor calculates the difference between the starting point and ending point of your touch.

The processor uses its gesture-interpretation software to determine which gesture you made. It combines your physical movement with information about which application you were using and what the application was doing when you touched the screen.

The processor relays your instructions to the program in use. If necessary, it also sends commands to the iPhone's screen and other hardware. If the raw data doesn't match any applicable gestures or commands, the iPhone disregards it as an extraneous touch.

All these steps happen in an instant -- you see changes in the screen based on your input almost instantly. This process allows you to access and use all of the iPhone's applications with your fingers.

The shape of the screen changes when you need it to as well -- you can shift the perspective from vertical to horizontal by tilting the phone. An accelerometer inside the iPhone lets the operating system know to change the orientation of the image on the screen. This means that you can scroll through long lists of music files on a long, narrow screen, and you can watch movies in a widescreen format.