Bonding technologies: Liquid optically clear adhesive (LOCA) (part 2 of 3)

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By Steve Baker | Jan 14, 2021
LOCA bonding on a display

In our previous blog, we discussed the benefits and drawbacks of air gap bonding. In the second blog of our three-part bonding technologies series, we will focus on the most widely used bonding capability at GMN: liquid optically clear adhesive (LOCA) bonding.

What is liquid optically clear adhesive (LOCA) bonding?

As the name suggests, this process involves bonding parts of the stack-up together with a liquid adhesive. Instead of leaving a gap between components as with air gap bonding, the clear adhesive fills in the entirety of the space between the two layers. Primarily used when bonding two rigid materials, LOCA bonding is typically chosen for its increased impact resistance, sunlight readability, and optical clarity.

For each display, GMN’s engineers develop custom fixturing to fit the precise dimensions of the components. A program is then designed to find the proper amount of adhesive and optimal dispensing pattern which is unique to each assembly. Highly precise metering equipment then dispenses a consistent amount of the liquid adhesive specific to the fixturing and program.

LOCA bonding takes place in a class 10,000 clean room and the adhesive is UV-cured. Lastly, GMN employs a series of sophisticated test and inspection methods to ensure quality control. 

Why choose liquid optically clear adhesive (LOCA) bonding?

LOCA bonding technology is highly regarded due to its strong overall performance and high level of impact resistance. To see the strength of a liquid optically bonded display in action, watch our ball drop test comparing LOCA bonding to air gap bonding.

Another major benefit of LOCA bonding is the optical clarity, which is achieved due to the liquid adhesive not allowing any air gaps to form in the stack-up. LOCA bonding is also a popular solution because it is a re-workable process. If needed, components can be salvaged and re-used, increasing overall manufacturing yields.

LOCA bonding is a robust technology that GMN has been providing for more than a decade. GMN leverages proprietary processes and adhesives to provide the best bonding solutions to our customers. To learn more about this unique bonding process, watch our video below.

Read our other blogs in the bonding series:

Bonding technologies: air gap bonding (part 1 of 3)

Bonding technologies: optically clear adhesive (part 3 of 3)