The Touch Screen
One cozy evening, I gazed a lazy look to the surrounding. From the looking glass of a Lazy individual everything looks dull.
But once my vision tuned in on the Smart Phone, it struck me that I had no idea how this thing works but yet have been using it constantly for years. Time to disparage the boredom !
This is an account of the bewitching touch screen world. All Aboard!
The Resistive Touch Screen
If you have used a mobile phone in the distant past that involves you pressing down hard on the screen, then there is a great possibility you have used a Resistive touch screen.
Some examples are the Nokia N800, Nokia N97, HTC Tattoo, Samsung Jet or the Nintendo DS.
How does it work?
This is the traditional form of a touch screen and its working is rather blunt. There are two conductive sheets present that are separated by spacers.
When you press your hand against the screen , the top layer gets pressed and
makes contact with the bottom layer. This completes an electrical
The act of pressing reduces the resistance between the two conductive plates. (because you are reducing the distance between these two conductive plates and resistance is dependent on the length of the medium)
The voltage established as a result of this change in resistance is measured and the coordinates of the point of contact are determined.
The harder you press, the more the change in resistance.
This is one of the frustrating things about this type of touch screen.
Resistive touchscreen require slight pressure
in order to register the touch, and are not always as quick to respond.
But they are used in many low-budget mobile phones like the Freedom 251, which is a touch screen phone for $3.75.
The Capacitive Touch Screen
Now over to the touch screen that we are most accustomed with: the capacitive type.
Capacitive touch screens are constructed from materials like copper or indium tin oxide that store electrical charges in an electrostatic grid of tiny wires, each smaller than a human hair
When a finger hits the screen a tiny electrical charge is transferred to
the finger to complete the circuit, creating a voltage drop on that
point of the screen.
Due to the transfer of some amount of charge from the screen to your
body. this change will be noted by the monitor placed below the screen
and the exact location of your touch is noted.
Plastic does not allow charges to flow through. Ergo, if you try to use it whilst wearing gloves or anything plastic / non-conductive materials, the screen will not respond to your touch!
But leather or other conductive materials on the other hand will allow charges to pass through, which is why they work well with any smart phone.
Hope you guys enjoyed this post . Have a good day!
* Some of these facts may not apply to Rugged phones like the CAT S61 or its variants.