The Working Principle of iSurface Touch Technology
Surface capacitive touch
panels are often used in relatively large panels. Inside these panels, a
transparent electrode film (electrode layer) is placed atop a glass substrate,
covered by a protective cover. Electric voltage is applied to electrodes
positioned in the four corners of the glass substrate, generating a uniform
low-voltage electrical field across the entire panel. The coordinates of the
position at which the finger touches the screen are identified by measuring the
resulting changes in electrostatic capacity at the four corners of the
panel.
While this type of capacitive touch panel has a simpler structure than a projected capacitive touch panel and for this reason offers lower cost, it is structurally difficult to detect contact at two or more points at the same time (multi-touch).
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