Heres the answer to How touchscreens work? // A touchscreen is an electronic visual display that the user can control through simple or multi-touch gestures by touching the screen with a special stylus/pen and-or one or more fingers. // The two most commonly used touchscreens are: Resistive Touchscreen: It consists of a flexible top layer and a bottom glass panel, both coated with conductive and resistive material. They are divided by spacers and an electric current flows through them. When we touch the top layer, it makes contact with the glass panel and hence there is a change in the electric current. Hence the OS gets the coordinates of the point of contact. Capacitive Touchscreens: It consists of a glass screen with a conductive layer on top of it. When we touch it with our finger, it changes the amount of charge at the point of contact. And so we get the exact point. (Btw, Our fingers are also conductors if you havent figured it out already :P) Multitouch: The numerous capacitors under the hood are able to sense the change at each and every point. Every point has its own indication and hence the processor can use it for multitouch application. How is the signal used then? The signal travels as an electric impulse. A software helps the processor to analyze the impulse and its exact attributes. Hence every gesture can be given a certain task. After the interpretation of the gesture, the processor moves on to complete the task. Heres a little DIY : Stuff: Cotton Bud, a drop of water and some aluminium foil. Wrap the aluminium foil around the plastic and 25% of the cotton. Take a drop of water and apply it to the wrapped cotton. Hold the cotton bud such that the aluminium foil touches your finger. Make sure that it also touches the cotton. Now use it like a stylus on your capacitive touchscreens. Resistive touchscreen users can use pens, pencils and whatever they have at their disposal. :P
Posted on: Fri, 07 Mar 2014 13:13:31 +0000
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