TOUCH SCREEN TECHNOLOGY

Hey guys happy to see you all with this new post.

Actually i was bit  sad a couple of days back. Why you know i just dropped my expensive smart phone on the floor and it developed crack at the bottom right corner and the portion below the crack stopped sensing my touches. Yes i need to replace the screen now. So thinking about this i just got a quest on how these touch screen works. So i started to make a small quick research over the internet on how these gadgets work so that i could get a glimpse of what these technologies are all about, And Actually i got some interesting stuffs which i thought of sharing with you all.

I found that there are two types of touch screen that is been used widely they are

• Resistive  touch 
• Capacitive touch

RESISTIVE TOUCH SCREEN 

You would have seen these type of screen in railway station, theaters while taking tickets. For basic understanding  let us first separate the layers of the screen which gives a top layer and a bottom layer.

      

the top layer is the Resistive layer which consist of its own circuits and the bottom layer is known as the conductive layer which has its own circuits. You may have even noticed that while you use these screens, when you touch these screens it may  move inwards. It is because there always exist a gap between the upper layer and the bottom layer and when you touch the screen the top layer may come in contact with the bottom conducting layer so the electricity now got a path way to move and complete its path thus the current completes its path. These signals are sensed by the processor and the corresponding function occurs. One of the disadvantages of these screen is that only one  touch is supported by this technology  in contrast today's devices support multi-touch for which the capacitive touch technology is being is used.

CAPACITIVE  TOUCH SCREEN

So today all our latest smart phones are not using the former technology, where as it uses another approach of known as capacitive touch technology. Even in this case in order to understand , let us peel of the screen of the smart phones into different layers

So when we separate it, we will able to see 4 different basic layers, the top most one is a protective cover which is made special glass (sand heated to form  aluminosilicate which is  dipped in potassium bath  this rips of the sodium ions from the glass and replaces with the potassium ion). The next  two layers consist of vertically and horizontally lines of  electrodes thinner than human hair  is embedded on the glass material, the top one contains the driving lines and the bottom one contains the sensing lines which senses the electrical signal of the driving lines  both these lines are perpendicular to each other forming a grid like structure. The last layer here is the LCD layer. 

So how does this technology works. You know our human skin contains electrostatically charged particles, so when we touch the screen the charge on our finger is transferred to the screen and tends to make changes to the charge in the grid structure, actually the sensing lines which is said above is connected to the processor of the smart phone these processors can sense the change in the charge at the particular spot where the finger touches and functions accordingly. Finally all over outputs are in our LCD screen which we look and enjoy.

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I think you can see the grid lines clearly which appears on the screen when we touch the particular spot, the horizontal and vertical lines are clearly seen, this is a multi-touch experience in a kit kat enables android device .

LATEST TECHNOLOGY

There are two different new technologies which is used today they are ON SCREEN ans IN SCREEN touch screen. The ON SCREEN technologies is bringing the touch screen technology up to the top layer of the screen. The IN SCREEN technologies is bringing the touch to bottom of the screen. The main advantage of this technology is that you can get a smaller thinner phone and get a colour saturation as the light doesn't need to pass through many layers.

INTERESTING FACT!!!

The first touch screen was first introduced in the year 1976

I  think you got a good piece of information regarding our day today handy devices and how it works. hope you enjoyed reading this information.Thank you guys see you in the next post with another interesting information and  Don't forget to comment about this post....