New SCA gel materials for optical bonding of medium and large display sizes

SCA bonding for increasingly sensitive display formats 

Modern display generations are becoming increasingly sensitive to mechanical stress and strain. Particularly with large display sizes, material-related shrinkage of acrylic-based liquid adhesives can increase mechanical stress and raise the risk of Mura effects. Compared with liquid adhesive systems, the new SCA materials offer cost advantages and simplify the bonding process. At the same time, they extend the possibilities of gel bonding to larger display formats.

Material selection for different applications

Depending on display size, environmental conditions and project-specific requirements, we use different gel materials:

• Polyurethane gel (PU): Particularly suitable for smaller display sizes from 1" to 13.3"; for larger formats, its use becomes less cost-effective 
• Acrylic-based SCA materials: A cost-effective solution particularly suited to medium display sizes from 12.1" to 18.5" and indoor applications 
• Silicone-based SCA materials: Particularly suitable for large display sizes from 15.6" to 65", outdoor applications and high-temperature environments. Silicone is also less susceptible to air bubbles and the resulting optical artefactss

SCA complements LOCA: More options within the bonding portfolio

Despite the extended possibilities offered by gel bonding, LOCA (Liquid Optical Clear Adhesive) technology continues to play an important role for us at DATA MODUL. It is used primarily for displays where a larger gap between the polarizer and frame needs to be compensated for, as well as for optical bonding of hard-to-hard connections between glass and glass-based touch sensors using SITO or DITO technology. 

“By adding acrylic- and silicone-based SCA materials to our portfolio, we can address a wider range of display sizes, operating environments and design requirements. At the same time, LOCA remains an important technology for specific specific bonding needs. Customers benefit from greater design flexibility and the ability to select the right material and bonding technology that best fits their application,” says Manfred Steber, Head of Products (Cover Lens/ Bonding/ Sensors) at DATA MODUL.

The benefits of optical bonding

Across all material types, optical bonding improves image quality by reducing reflection losses, increasing contrast and perceived brightness, and creating a uniform, dark black-panel appearance when the display is switched off. At the same time, the full-surface bond protects against dust and moisture and increases resistance to shocks and vibrations.

Full optical bonding has therefore become an established standard for numerous display applications and is considered at an early stage in many new product developments. With its broad portfolio of gel and liquid adhesive systems, DATA MODUL can address a wide range of display sizes, operating conditions and design requirements, providing the basis for application- and market-specific optical bonding solutions.

Interested?
Don't hesitate to contact your DATA MODUL sales partner for more information!