Optical Bonding Facilities

To ensure consistent and stable quality, Tontouch operates its own in-house optical bonding production line. Optical bonding improves LCD readability and durability, supporting reliable performance in industrial and outdoor environments. With controlled internal processes and validation, we can recommend the right bonding approach for different use cases—while maintaining high quality across a wide range of panels and project requirements.

Improved readability in sunlight

Reduce reflection

Enhance Ruggedness and durability

Prevents condensation or fog on the display

Core Technology

Optical bonding can be implemented with different processes and materials—such as silicone, polyurethane, epoxy, and acrylic-based adhesives—selected based on the product structure and application needs. These bonding materials are typically cured through controlled mixing and curing conditions, including heat curing or UV curing. Depending on the design and production requirements, bonding can be performed as wet bonding (LOCA) using a liquid adhesive, or as dry bonding (OCA) using a pre-formed optically clear adhesive film.
As with any adhesive process, material selection directly impacts long-term durability, and strong adhesion and compatibility with the component surfaces are equally critical. To ensure consistent bonding quality, we apply dedicated surface preparation before bonding, including a two-stage pre-treatment process to improve adhesion performance and overall reliability. This approach helps stabilize the bonding process—even on more challenging surfaces—resulting in stronger, more reliable bonding outcomes.

OCA

OCA is a simpler, faster and more cost-effective process, still offering good durability and readability. By applying this process, the air gap is eliminated and therefor the reflective index is reduced and brightness of the display increased, resulting in enhanced visibility. 

OCR

OCR is the most durable of these methods, able to best withstand impact, shock and vibration. It offers the best readability, especially in sunlight, since it is best at eliminating internal reflections.

Optimal Readability of Displays in Sunlight

Excellent readability of displays plays an important role in all areas of application. They must have a high contrast ratio and ideally be easy to read even in sunlight. VIA optronics offers the solution with the patented MaxVU™ process for optical bonding and the proprietary material VIA bond plus.

Bonding material and process are perfectly matched and adaptable to all designs of cover lenses, touch panels and displays. The optically bonded display solutions and systems eliminate all internal reflections. The result: high contrast ratio and exceptional readability in sunlight, while providing mechanical stability and preventing moisture particles between the display layers.

Which optical bonding process is suitable?

The optical bonding process and adhesive selection depend on the display’s operating environment and use case. Based on the application details you provide—such as outdoor/industrial conditions, mechanical constraints, and reliability targets—we evaluate and recommend the most suitable bonding approach, delivering a cost-effective solution without compromising performance or durability.

Increase product durability and performance

With robust processes and reliability-focused design, our display components are built to withstand demanding environments, including:
．High altitude and pressure changes
．Extended operating temperature ranges
．Severe shock and vibration
．Condensation and moisture exposure
In addition, optical bonding eliminates air gaps between bonded interfaces, helping reduce the risk of internal condensation and improving long-term reliability in outdoor and high-humidity deployments.