Bonding Possibilities for touchscreens

Bonding Possibilities for touchscreens

 

Sensor Bonding

 

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  Optical Clear Adhesive (OCA) Lamination

  This is a lamination process with optically clear adhesive (OCA). A lamination from “soft to hard” takes place, e.g. a film-based sensor (ITO / mesh) behind the coverlense. With the help of storage in an autoclave, the air bubbles are eliminated.

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  Liquid Bonding

  Here bonding of “hard to hard” is done, i.g. a glass-based PCAP sensor is bonded behind the front glass.

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  Air Gap Bonding

  In this process, the display is glued all around with an adhesive frame directly behind the sensor or on the printing of the coverlense in the clean room. An air gap between the display and the sensor / coverlense remains.

  Air bonding is a simple and cost-effective way to connect displays with coverlenses or touch sensores. Depending on the application, the assembly takes place with single adhesive strips or with a closed adhesive frame.

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  Liquid Optical Clear Adhesive (LOCA) Bonding

  The air gap between the display surface and the rearside of the sensor is filled with a UV liquid adhesive. The adhesive is silicone-free, non-aging and UV stable. The method is suitable for TFT displays with frames.

  This method is already a common bonding technology. The liquid adhesive is applied over the cover glass and then bonded to the touch panel or TFT panel. The adhesive is spread evenly and bubble-free between the two components. The adhesive is cured without heat using UV light. This prevents …

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  Dry Bonding

  In the dry bonding process, the bonding material is cut to the size of the visible display surface. The assembly of the front glass with the touch and display is carried out under vacuum in the bonding machine. This method is not suitable for all displays.