What is the optical bonding process?

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TFT LCD monitors are susceptible to glare and reflection from direct sunlight or high-bright applications. In almost all TFT LCDs there is an air gap between the TFT panel and the cover lens. Having an air gap causes repeat refraction between each component level of the display when in high-brightness installations. Reducing the reflection inside these components with optical bonding gives greater contrast and makes the screen more viewable in outdoor or high bright conditions without the need to increase the brightness of the screen itself.

What is Optical Bonding?

Optical bonding is a process where a layer of resin is applied between the glass or touchscreen and TFT LCD TFT panel of a monitor, bonding them to make a solid laminate with no gaps or pockets of air. When choosing a screen for any project, you should evaluate the environment and operating conditions the screen will have to endure. Industrial grade screens and panel PCs are made rugged with all types of features available to withstand any type of application. One such feature available to consider is optical bonding.

Which industries are most suited to Optical Bonding?

Optical bonding is popular among the military, marine, medical, transportation and retail sectors whereby a higher performing display is required due to the harsh environments. Optical Bonding is suited to industries that tend to use rugged displays in high reliability environments or industries where displays need to be seen in high ambient light conditions. The process of Optical Bonding is particularly well suited and much more effective when applied to devices that operate outdoors or in heavily lighted environments.

When LCD displays are manufactured, including touchscreens, the front glass of the screen is layered onto the LCD module. This doesn’t present a problem in standard viewing environments, however in certain conditions, like with outdoor placement, the tiny gap between the 2 layers can impair viewing performance.

What are the benefits of optical bonding?

The display from an non-optically bonded monitor is created by the light of the LCD reflecting through the gap and then the outer glass of the screen. The light is interrupted and bends when it passes through the gap and glass of the screen and some of the light is actually reflected back to the LCD module, this is called refraction. This refraction through the layers impairs the intensity and clarity of the end image and thus lowers brightness and readability. By bonding the LCD module and glass together you remove the interruptions and chances for the light to be reflected back. More light gets through to the surface of the screen and therefore the image is brighter.

The same principle is applied when an external source of light hits the screen. With an non-bonded screen, the gap between the glass and LCD module creates opportunities for refraction which bounces external light back off the screen to the viewer as glare. When bonded together the light passes through the bonded layers and is absorbed somewhat into the screen. Optical bonding is therefore important in making screens sunlight readable.

Optical bonding makes screens more physically durable

The additional resin layer in optical bonding absorbs shock. This provides high durability for use in public access areas, factories, or other harsh environments.

The most obvious benefit to adding a resin bonding layer between the glass and LCD module is that it physically prevents dust and liquid ingress from getting between the two. The quality of manufacturing means that dust and water isn’t a big problem for screens in standard environments. What can be a problem however is condensation getting between the glass and LCD panel in environments with wide temperature ranges or fluctuating humidity. Condensation can cause screens to become foggy from moisture that penetrates the air gap. Again, the physical filling of the gap prevents this problem from arising. Optical bonding should therefore be considered for any outdoor application as well as indoor applications where consistent temperatures aren’t maintained.

A touch monitor with optical bonding maintains a more accurate touch response because the pressure is maintained through the substrate, rather than being delayed by a gap.

Optical Bonding Services

Assured Systems are partnered with design and manufacturers industrial displays with optically bonded touch screens request, their displays or touchscreen displays can be optically bonded to remove the air gap inside the screen. If you require an optically bonded display or optically bonded panel PC please get in touch with Assured Systems.

In this blog, we dive into the world of optical bonding— what it is, why it's a crucial technology, and its diverse applications in industrial settings. We'll showcase real-world examples of its impact and offer a preview of Premio's range of Optical-Bonding viable display systems.

What is Optical Bonding?

In the realm of display technologies, optical bonding stands out as a fascinating process that brings two optical materials together, not with conventional glue, but through the power of intermolecular forces. Put simply it is when a resin is applied between a touchscreen and a thin-film-transistor liquid-crystal display (TFT LCD) panel.

When investing in screens or displays, opting for optical bonding proves to be a game-changer. This technique dramatically enhances visibility, boosts the clarity of on-screen content, while also extending product lifespans. Ultimately, enhancing overall user experience and the overall value of industrial display systems. 

How does optical bonding work?

Optical bonding revolves around the use of optical adhesives. With various materials and application methods available, optical bonding gives rise to terms like "wet bonding," "dry bonding," and "air-gap bonding."

We go into detail for each type below: 

• Optically Clear Resin (OCR) - AKA Wet Bonding: Wet bonding utilizes an optically clear resin to achieve seamless display integration.

• Optically Clear Adhesive Sheet (OCA) - AKA Dry Bonding: Dry bonding involves the application of an optically clear adhesive sheet.

   

• Air Gap Bonding with Optically Clear Adhesive Tape: Air-gap bonding uses an optically clear adhesive tape, creating an "air gap" between display elements.

Join us as we explore the versatility and benefits brought by each method. 

What is OCR or “Wet Bonding?”

Optically Clear Resin (OCR), also known as "Wet Bonding," is a form of optical bonding that revolutionizes display screen technology. In this process, a clear resin, typically an optical cement, is delicately applied onto the display surface, and additional optical elements like glass covers or touchscreens are precisely adjusted onto the resin layer.

Upon completion, the clear resin is cured, transforming the liquid into a solid form. The result is a seamless integration of the separate optical components, creating a display that boasts unparalleled visual quality and physical durability.

The process involves a two-part system. Firstly, optical cement or resin is carefully mixed in precise ratios and filtered to eliminate any trapped air or debris. Subsequently, the second part consists of curing the optical adhesive, which is achieved through UV curing. Compared to older methods that relied on time or increased temperatures, UV curing significantly reduced curing time to approximately an hour. However, cleanup is essential post-curing, as the process can be somewhat messy.

A popular choice for adhesives in wet optical bonding is silicone, a trusted material that dates back to the 1970s when it was first introduced in LCDs. Silicone's desirability stems from its low thermal expansion rate, low chemical reactivity, low conductivity, water repellency, design flexibility, and its ability to maintain clarity over extended periods—all at an affordable cost.

What is OCA or “Dry Bonding”?

While liquid optical bonding remains popular and widely used, there is always room for improvement. Introducing Optically Clear Adhesive, also known as "dry bonding," a cutting-edge form of optical bonding that takes display technology to new heights. Unlike its liquid counterpart, OCA is a solid material composed of silicone or acrylic, making it a "dry" bonding solution. 

OCA comes in the form of a precisely cut dry sheet with a double-sided liner for seamless application. The bonding process involves an initial lamination, followed by pressure applied to the optics within an autoclave. This remarkably efficient process takes less than 30 seconds to complete. 

Dry bonding takes place in a clean room environment, free of debris and trapped air, eliminating unnecessary complexities associated with the two-system wet bonding process. The absence of liquid materials streamlines the bonding procedure, ensuring results in less time. 

With OCA/dry bonding, display technology achieves significant improvements in clarity, durability, and precision. This innovative approach presents a game-changing solution for various industries seeking optimal performance and reliability in their display systems. 

Wet vs Dry Optical Bonding

Wet bonding's two-part system demands meticulous preparation to avoid air-bubbles and foreign debris in the resin mixture, requiring expert knowledge from the manufacturer. Moreover, once liquid resin is cured, reworking becomes unfeasible, leading to product wastage and potential damage to the display system during bonding. The longer processing times further add to the complexity of wet bonding. 

In contrast, dry bonding offers a streamlined solution with faster processing times, reworkability, and cleaner handling of solid materials. Automation becomes more accessible, and the bonding process benefits from increased shock/vibration and temperature resistance. Notably, the curing of the dry film sheet before bonding eradicates the risk of "yellowing" often observed in resin-based applications. 

What about Air Gap Bonding?

Air-gap bonding, also known as framed adhesive, employs a gasket placed around the edges of the display to connect two display optics together, creating an "air gap" between the display screen and the additional optics. 

This bonding method stands out for its affordability, as it requires no cure-time and readily available materials. Its lightweight nature makes it a popular choice for display technologies that don't demand resistance to volatile environments, such as the outdoors with potential glare issues or exposure to extreme temperatures and high humidity levels that might affect device performance. 

Air-gap bonding offers a budget-friendly and practical solution for display applications that don't require the robustness of other optical bonding methods. 

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How does wet or dry optical bonding improve visibility?

In a word: Refraction. Refraction occurs when light rays bend upon passing through different mediums. When multiple layers of mediums are involved, more refraction occurs, leading to readability issues for end-users. Essentially, light reflects off the screen, making it difficult to view the display's content. 

In outdoor or harsh conditions, air gap bonding proves insufficient due to higher refraction rates and moisture build-up caused by the gap between the two optics. In these circumstances, wet and dry optical bonding emerges as more viable options, effectively filling the gap between the optical elements. This not only improves the product's environmental performance but also enhances its ruggedness. 

By addressing refraction challenges through advanced bonding techniques, display technologies can offer enhanced clarity and readability, ensuring optimal performance in a wide range of environments and conditions.

What are the advantages of wet and dry optical bonding?

Utilizing wet and dry optical bonding methods results in significant improvements to the strength and quality of display systems, delivering a host of benefits, such as: 

Enhanced Readability in High Sunlight Areas:

• Lower reflection ensures visibility, even in brightly lit environments, offering an enhanced display experience.

   

Elevated Graphic Performance:

• Higher contrast, color saturation, and wider viewing angles elevate graphic performance, providing users with more vivid visuals.

   

Increased Durability and Ruggedness:

• Optical bonding provides heightened impact and shock absorption capabilities, protecting displays from accidental damage.

   

Extended Product Lifecycle:

• Through resistance to moisture and condensation, optical bonding prolongs the lifespan of display systems, reducing overall maintenance costs.

   

Optimal Touchscreen Performance:

• The additional resin layer enhances touchscreen responsiveness, maintaining accurate touch responses, ensuring seamless user experience.

   

Examples of optical bonding applications across industries

Optical bonding, specifically wet and dry bonding, is beneficial for enterprises operating in challenging environments air-bonded display systems would not fare well in. Some industries that benefit from optical bonding include: 

Food & Beverage: 

• Frequent washdowns for maintenance of hygiene standards can be handled with ease by optically bonded displays, ensuring uninterrupted operation.

• Display systems exposed to liquids and chemicals are protected against corrosion, ensuring reliable performance in critical medical environments.

   

Outdoor Displays and Digital Signage: 

• Optimal readability under sunlight or strong headlights ensures users can read screens effortlessly from a distance.

   

Kiosk Applications and Human-Machine Interface (HMI): 

• High ruggedization requirements for outdoor vending machines and cashiers are met, reducing downtime due to frequent customer use.

   

Military, Marine/Offshore, Aviation, Freight, and Logistics: 

• Resilient against high glare, condensation, and extreme weather changes, optical bonded displays excel in demanding environments with shock and vibration challenges.

   

Anticipated Trends in Display Technology

As the Industry 4.0 revolution unfolds, automated machines and processes become more prevalent, with computer displays emerging as the primary mode of human-machine interaction. Today, screens are no longer confined to desktops but are integrated into various everyday tools, such as kitchenware, smartwatches, and even vehicles. With increasing screen-time for users, the importance of optical bonding cannot be overstated in enhancing user experience and product longevity.

In the industrial landscape, investing in optical bonding proves to be highly valuable. The impacts of global warming, including brighter and warmer days, unpredictable downpours leading to higher humidity, and even harsher winters, pose challenges for display systems to function seamlessly.

Furthermore, with the exponential rise in data production and daily interactions through these displays, ensuring optimal functionality becomes crucial for promoting data security and protecting personally identifiable or private information for enterprises. The stakes are high, as data-loss and leaks may be just a mis-click away.

In this evolving digital era, optical bonding emerges as a compelling solution to elevate user experience, bolster display performance, and safeguard data integrity for industries at the forefront of technological advancements. 

Why Choose Optically Bonded Premio’s Display Systems?

In conclusion, optical bonding emerges as a true marvel in the realm of display technologies, revolutionizing the way we experience visuals on our screens. Through optical adhesives, wet bonding, dry bonding offer unique advantages, empowering enterprises with displays that ensure reliable and seamless operation in hazardous and volatile conditions. 

Leverage the power of optical bonding and unlock the full potential of your industrial displays with Premio's range of ruggedized panel pc offerings, the VIO Series and SIO Series, purpose-built for the toughest embedded deployments requiring mission-critical reliability. Transform your industrial applications with our cutting-edge solutions today.

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