How a Touch Screen Optically Bonded on a Display Panel?

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How a Touch Screen Optically Bonded on a Display Panel?

Mar. 14, 2022

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. Here we'd like to briefly introduce more details.


Display panels are usually devided into two types, with sheet metal frame and without sheet metal frame. For display panels without sheet metal frame, first, laminating the OCA to the touch screen on the laminating machine. We usually use Mitsubishi 0.2mm thickness OCA. After OCA bonding, put the touch panel with OCA on the display panel and do the vacuum bonding process, then remove the air bubbles. 


LOCA - Optical Bonding PCPA Touchscreen to TFT-LCD.jpg

For display panels with sheet metal frame, LOCA is the right optical ahesive. The distance from the display surface to the top metal frame is roughly 0.5mm to 1mm. OCA thickness is not thick enough to fullfil the space. Hence, we use LOCA to bond them together. Here are two key points for optical bonding with LOCA. Point 1, as it is liquid, seal metal frame gap is very important to avoid the LOCA running into the LCD; point 2, use LOCA's flexibility to make sure it is flat and no air bubbles between them.


LOCA - Optical Bonding PCPA Touchscreen to TFT-LCD.jpg

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