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Optical bonding is using optical clear adhesive (OCA) or liquid optical clear adhesive (LOCA) to bond a touch screen to a display panel. The touch and display panel are fully bonded together with no air gap between them, which reduces the light refraction and enhances the display quality.
The most ordinary layers for a PCAP touch screen is glass-on-glass structure. That's a cover glass optically bonded on PCAP touchscreen sensor glass. Do you know how the two pieces are optically bonded together?
Tape-bonding is also known as air-gap bonding, as a touch screen is bonded on a display panel with double-sided adhesive tape around the border of both panels and there is an air gap between the touch screen and the display panel.
We're still emailed quite often and asked to explain the different types of touchscreen displays. So, with that in mind, we’ve decided to provide a simple guide.