Touch Screen Overlays, as a key component of the touch screen structure, are the outermost materials that directly contact the user's fingers. It is usually overlaid on top of the sensor layer of the touch screen and is designed to protect the sensor layer from physical damage while providing a clear, smooth touch experience. There are two main materials for the touch screen cover: glass and plastic. Glass coatings, especially chemically strengthened glass, are widely used in high-end equipment because of their high hardness, good wear resistance and high light transmittance. Plastic overlays, such as polycarbonate (PC) and polyethylene terephthalate (PET), have found a place in wearables and flexible screens due to their lightweight, impact resistance.

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