How does Touch screen works in your mobile?

   10 years ago,we are using keypad mobile phone like Nokia 6100,3315 6600,etc.,and most of people use land line for communication.But,now-a-days most of people using android or iphone.A touch screen first start with iphone and it came 11 years back with a full touch screen.Only some people know how touch screens are work.So,in this post clearly explain about how does touch screen works in your mobile phone.

Two types of touch screen presents:

                   

              1. Resistive touch screen

              2. Capacitive touch screen

        Both type principle are same as,Change in electric signal processor finds where touch happen.In resistive touch screen,a electric signal develops by pressure of touch where as in capacitive touch screen a electric signal develops by conductivity of finger.

RESISTIVE TOUCH SCREEN:

              It is the first type of touch screen.In this type,it has two layer as upper and lower.A upper layer is flexible and transparent layer and made by polyethylene.A lower is strong material and it is made by glass.

     

A upper layer is called resistive layer because it does not able to conduct.A lower layer is conductive layer and it does able to conduct electricity.A metal coating is provided to lower layer for to conduct electricity. 

This two layers are separated by spacers.Always a conductive layer is connected with source.When we touch the resistive layer,a upper layer touch the capacitive layer due to pressure of touch.So voltage magnitude is varied in conductive layer.A touch screen processor converts voltage to X-Y co-ordinates.

It is very cheap ,strong and simple method.But it does not allow multi touch and need to press hard.

CAPACITIVE TOUCH SCREEN:

           

This type touch screen is used in mobile phones.It has many layers.A upper layer is protective layer where as lower layer has two layer,one is driving lines layer and second layer is sensing lines layers.
These two layer made as grid using thin size of conductive material.

The meeting point of driving lines layer and sensing layer has electrostatic field.It is already stored in processor as 'neutral' or 'zero(0)'.Our fingers carry charge and the grid layers are conductive when we touch the screen,so changes occur in electrostatic field.Based on change processor finds X-Y co-ordinates.In this type allows multi touch,swipes.