How Does Touch Screen Work
Now a days Touch screens have a role in our live , They are present every where whether it’s a mobile phone , laptop or a tv.
Have you ever though that how do these touch work ? So in this blog here is the answer to this question . Do you know that touch screens were arrived many decades ago in the 60’s .
In 1960 E.A Johnson created the very first touch folder driven screen At that time it could process just one touch at a time , so it’s a long way to the multi touch display .
However touch screen were getting popular in 1970’s when a resistivity touch screen was accidentally invented .
Further developing on this new technology University Of Toronto invented the first multi touch display in the 1980’s .
The very first touch screen cell phones come a little later in 1990’s . And day by day this technology improved.
So let’s get into different types of displays to understand how does this touch screen work .
If you think that there is only one phenomenon behind the working of the touch screen you are wrong ! There are a lot of other factors that together make up the touch screen .
The screens that you would be most familiar with is Resistive and Capacitive display . Resistive touch screen are the most simplest and commonly used .
If you’ve ever withdrawn cash from an ATM you know what they are . What about the part-time job you had as a cashier when you were a teen or each time .
You sign your name (or just draw a smiley face !) when you’re checking out at the grocery store . Those point of the screens are also this type .
The technology is very simple like when you press on the screen hard enough , and it bands and resists your tough .
But what happens next ? The thing is that a resistivity screen consists of two layers that can conduct electricity . Whereas while one of these layers is resistivity and the other is conductive.
And between them , there are these think called spacers . There are tiny dots that separate the layers until you touch the screen .
So , to put it simply , an electrical current is constantly though the two layers Then all of a sudden , your finger hits the screen .
The two layers get squished together and the electric current changes . The devices software feels a charge in this particular spot and does its work .
It means that it fulfills the function that corresponds with that place . You click on a $ 20 button instead of $ 50 button and the ATM spits our your 20 bucks ! .
Most of the resistive touchscreen are reliable and durable . But on the downside they’re pretty hard to read due to their multiple layers .
The more light falls on the display the harder it is to make out what’s written there. Do you have tried to withdraw cash at an outdoor ATM on a sunny day ? forget about it .
And the other disadvantage are that you can’t zoom in to see the little print more clearly . Unfortunately risistive screens can handle only one touch at a time .
So , do anyone have this type of screen on your phone ? Thank god it’s not . So what do you use to scroll thought social media over and over again is a Capacitive screen .
And it’s main difference from the resistive kind is that this screen doesn’t want you to touch it with your finger.
The Capacitive screen changes the electric current when it come into contact with anything that holds an electrical charge and by that i mean you – or rather your skin .
Like everything is made up of atoms it also consists of atoms that are negatively and positively charged. Capacitive touch screens are made from either indium tin oxide or copper .
Both of these materials keep electrical charges in super -tiny wires with each of then very thinner than a human hair. But hear’s where it get’s where it gets a bit more complicated .
The thing is there are two kinds of different capacitive touchscreens the first is projective and the other is surface .
Projective display use a tight grid of special sensor chips whereas if we talk about surface displays they use itsy -bitsy sensors in the corners as well as a paper thin film evenly distributed through the screen .
But whichever type of capacitive screen you use as soon as your finger hits the display it transfers a teeny electrical charge back to your finger !
And because of that a complete circuit which leads to a voltage drop in a particular place on the screen .
after all the the software analyzes the location of this voltage drop and follows your command .
And that’s how touch screen work .
I hope now you all know that how does touch screens work . If you have any question regarding this article you are free to comment below.