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What is Liquid Optically Clear Adhesive (LOCA) Bonding?

Liquid optically clear adhesive dispensing onto layers of a display

Last updated Dec 21, 2023 | Published on Apr 21, 2022

Liquid optical clear adhesive (LOCA) is a durable bonding method that utilizes a liquid adhesive.In our previous blog, we discussed the benefits and drawbacks of air gap bonding. In the second blog of our three-part display bonding technologies series, we focus on liquid optically clear adhesive (LOCA) bonding.

What is the Process Behind Liquid Optically Clear Adhesive (LOCA) Bonding?

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

For each display, Boyd's engineers develop custom fixturing to fit the precise dimensions of the components. Highly precise metering equipment dispenses a consistent amount of liquid adhesive specific to the display design. Our engineers design a program to measure out the proper amount of adhesive in the optimal dispensing pattern unique to each assembly.

The adhesive is cured with UV light in a class 10.000 clean room. Boyd tests and inspects each display with sophisticated methods and equipment to ensure the highest quality assemblies.

A graphic featuring the layers of an LOCA bonded display stack-up

Why Choose Liquid Optically Clear Adhesive (LOCA) Bonding?

Liquid optically clear adhesive bonding is used for its strong overall performance and elevated level of impact resistance. Another major benefit of LOCA bonding is high optical clarity, as the liquid adhesive prevents air gaps from forming within the stack-up. LOCA bonding is a popular solution because it is a re-workable process. If needed, the liquid adhesive can be removed and components can be salvaged and re-used, increasing overall manufacturing yields.

LOCA bonding is a robust technology that Boyd has provided to a variety of industries for over a decade. Boyd's experts leverage proprietary processes and adhesives to provide optimal bonding solutions for specific display requirements. To learn about the other display bonding technologies at Boyd, read the other blogs in this series below:

What is Air Gap Bonding?

What is Optically Clear Adhesive (OCA) Bonding?


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