The Glass/Glass (G/G) type capacitive touch panel (CTP) has been used for glass cover lens laminated
The cover glass is used to protect the sensor glass underneath, and the sensor glass is used to sense the touch points. The sensor glass is coated with two conductive layers of ITO: one for the x-axis, another for the y-axis. There are two types of G/G solutions: double-sided indium-tin oxide (DITO), patented by Apple, and single-sided ITO (SITO) that is the most popular used in the CTP industry.
The overall thickness of EDT’s G/G type CTP can be from 1.1 mm for portable device to 3.5 mm or even thicker for various industrial applications. Advantage for G/G type CTP is that the glass cover lens can be custom made by screen-printed on the rear surface, in-mold decorated (IMD), complex treatment with multiple holes and slots, rounded corners, even bent edges, and in most cases, chemically strengthen to enhance its resistance to external impact.