What is Optical Bonding?
What is Optical Bonding?
Why Choose a Liquid Adhesive Like Viz-Bond®?
Optical Bonding is the process by which a protective clear cover is joined to a display--such as an LCD or touchscreen.
The adhesive eliminates the air gap, creating one continuous layer between the two materials. This continuous layer, besides sticking the cover to the display, can decrease reflections, improve clarity, and strengthen durability by providing an optically clear, absorbent bond holding the assembly together.
What is liquid adhesive?
Liquid adhesive, or wet bond, is a type of optically clear bond that’s often a popular choice in LCD assemblies. Being liquid, it has several benefits that dry film lamination (another option for bonding) lacks. Wet bond is frequently used to join materials with uneven surfaces, pre-applied graphics, or for bonding sensitive materials that might not be able to undergo the pressure or heat of a dry film lamination process.
A wet bond is also extremely flexible and (being a liquid) can fill up the air gap in some assemblies more efficiently than a dry film. For example, displays with bezels are usually bonded with a liquid adhesive, since they would require a dry film of an exact depth. Instead of having to cut, shape, and perhaps even bond layers of film together in order to achieve the correct depth, the spreading liquid of the wet bond can fill up the gap fully and correctly, using a semi-automated dispensing process.
Another common reason for picking a wet bond is the size of the display. A medium or large display with a sensitive component, like an LCD, would be tricky to dry film laminate, as the LCD itself would be unsupported in the middle and would flex under the force of the heated plate during a vacuum lamination.
Viz-Bond® is our proprietary liquid adhesive
Viz-Bond WB is a liquid adhesive created by the Optical Filters R&D team. Viz-Bond WB offers the benefits of a liquid adhesive, with a few extra ones as well.
Viz-Bond’s low stress bonding process is ideal for heat and pressure sensitive components and materials as the bonding takes place at ambient temperatures, without pressure. Plus, it’s reworkable, enabling assemblies to be perfected. It’s liquid nature also allows it to be laid out as a gasket quickly and easily--unlike a dry film, which would be pretty tricky to manipulate into a gasket form.
Index-matching ensures that Viz-Bond WB will make displays clearer and more vibrant, by preventing internal reflections. It’s been designed to perform in rugged applications, in order to protect your display against moisture, dust, condensation, and extreme temperatures.