Presented By:
Mason Schoonover

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Capacitive Touch-Screens
How it’s Made
A capacitive touch screen is an all glass touch screen with a transparent metallic conductive coating.
The LCD display is found beneath the glass and conductive layers.
How it Works
There is a low voltage charge that is generated from the corners of the screen and distributed throughout the conductive layer.
When a finger touches the screen it draws a minute amount of current, creating a drop in voltage.
The device then pin points the location of the touch by the proportion of where the finger creates the drop in voltage on the screen.
Advantages and Disadvantages
Advantages
High touch resolution
High image clarity
Not affected by dirt, grease, or moisture.
Disadvantages
Will only work when touched by a conductive input.
Some capacitive touch screens can have erratic behavior when touched by more than one input.
Interesting Facts
A 15” capacitive touch screen costs about $2500.
It takes less than 3 ounces of force to activate the touch screen.
It is rated for 100,000,000 plus touches at each specific point on the screen.
Capacitive touch screens have been developed into multiple touch systems.
Uses
ATMs
Public Access Kiosks
Phones
Computers
Gaming machines
Point of Sale
Industrial controls
Hand held electronics