The inside secret of touch screen
Touch screen is so sensitive that the help of a little electricity in it can feel and tell where we are touching it. There are different techniques to archive sensitivity in the screen and these techniques have been developed in last 20 years and now it can feel the touch of our finger on it and it can sense mechanical, optical and electrical modes. At present capacitive electrical touch screens have established themselves as the most successful and popular.
In fact capacitive element in the screen is electrical circuit having two conductive electrodes with and insulating layer between them. This gap can not be covered by direct current but alternate current can induce a charge to flow from one side to another. The surface of the screen is covered with a mesh like electrodes. Where ever we put our finger a capacitive contact is generated and the AC current with in the smartphones in uses the same amount of current in our body and this action covers the gap between the two isolated layers of the electrodes and the circuit is completed.
Because human body is good conductor, this feature has been intelligently used to complete the electrical circuit on the grid of electrodes on the screen on the device and by completing the circle the capacitive touch feature is added to the screen. When you are holding the device in one hand and touching the screen with your finger completes the loop to the back site to the device which serves as earth terminal on the circuit.
You should not worry to know that electricity passes through our body. It is with in the natural conduction in our body and this ability is made use of in touch capacitive screens. In fact the secret lies in micro controller. Each grid in the touch screen has micro controller at the base with the speed of nano seconds and it is the speed that makes the image look smooth and complete.
This discovery and useful employment of this characteristic has opened doors for many innovations and many new users have been envisaged.
, 2015-12-25 07:23:45 Like : 0 , DisLike : 0 Comments : 0
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