A Capacitive Touch Screen is an all-glass touch screen with a double sided transparent conductive coating on the top surface.

How it works

There is an electrode pattern printed along the edges of the glass, which distribute a low voltage field over the conductive layer.  When a finger or conductive stylus touches the screen a minute amount of current is drawn to that point of contact creating a voltage drop.  The current flow from each corner is proportional to the distance to the touch point.  The X and Y locations of the point of contact are calculated by the touch controller and are transmitted to the host computer. 

Specification

             
Highlights & Benefits

• Large range of sizes 6.5” diagonal through to 21.0” diagonal incorporating all the popular display sizes in between.
• Superior durability and reliability, the touch can withstand a high concentrate of contaminants such as dust, dirt, grease, water and harsh chemicals.  .
• FPC has lower resistance and is more flexible than PET or ITO film used by our competitors.
• Excellent optical and responsive performance, fast light touches easily recognized.
• Controller Boards for Serial RS-232C and USB interfaces including full cabling connections and windows driver software.
• Compatibility with 3M-Microtouch controllers.

More detailed product tables on capacitive touch systems
can found in this PDF document.

Image on the right shows the controller for the capacitive touch components.