What role does the double glass of capacitive touch screen

We all know that the structure of the capacitive touch screen is mainly on the glass screen layer coated with a layer of transparent film, again outside the conductor layer on a piece of protection glass, double glass design can completely protect the conductor layer and the sensor. So what is the role the double glass? In addition, the touch screen edges are attached at the narrow electrodes, forming a low voltage ac electric field in conductive body. Users touch screens, electric field due to the human body, fingers and can form a coupling capacitance between conductor layer, electrode current will flow to the contact from the four edges of bag, and the strength of the electric current is proportional to the fingers and the distance from the electrode, located in the touch screen behind the controller can calculate the current ratio and strength, accurately calculate the touch point position. Now know, double glass not only can protect the conductor of capacitive touch screen and sensor, more effectively prevent external environmental factors affect the touch screen, even if the screen is stained with filth, dust, or oily be soiled, capacitive touch screen is still can accurately calculate the touch location.
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