Optical Bonding Solutions for Enhanced Display Performance

What does it imply to use an optical bonding technique?

• Classical optical bonding technology permits the integration of a touch sensor, cover glass, and display into a single unit by using several bonding techniques. In addition to the conventional bonding methods, we also provide hybrid bonding, one of the most cutting-edge bonding technologies. LOCA bonding is cured by UV radiation and suitable for cover glass, SITO Touch, or display connections (hard-to-hard). The “film bonding” or “OCA roll laminating” procedure is used to adhere the film touch sensor to the cover glass (hard-to-soft). Hybrid bonding, a more sophisticated fusion of the LOCA and OCA processes, is particularly well-suited for high-volume applications.
• To fill the space between them, the touchscreen glass is bonded to the LCD cell using optical bonding. This is done to strengthen the touchscreen, improve overall performance, and reduce the weight of the complete display. Adhesive tape is frequently used to attach interactive displays to LCD cells through the edges of the screen glass. This causes an air gap, no matter how little, between the LCD cell and the screen glass, which is damaging to the display’s operation. Due to the hole has specific effects, such as weaker screen glass, less touch sensitivity, and a reduced viewing angle, exist.
• Optical bonding is a process where a resin coating is put between the glass or touchscreen and the LCD panel of a monitor, attaching them to create a solid laminate with no gaps or pockets of air. You should consider the screen’s settings and usage requirements when selecting a screen for any project. Rugged industrial-grade screens and panel PCs are built with various characteristics to resist multiple applications. Optical bonding is one such characteristic to take into account.

Why should you choose Optical Bonding? 

The Optical Bonding solutions procedure is only one of the many services that Display Technology provides at the highest caliber. When it comes to internally applying optical bonding to electronics, our professionals have years of experience.

We can supply a sample of the finished product so that you can see the quality for yourself. Our excellent facilities are at the center of the entire process, guaranteeing that the service is carried out and completed to the highest possible degree.

We are happy to deliver exceptional service while efficiently meeting your unique optical bonding and display needs, thanks to our many years of industry expertise.

Which industries are especially suitable for optical bonding?

A higher-performance display is needed in these industries because of the severe surroundings, which is why optical bonding solutions are popular in the marine, medical, transportation, and retail sectors. Optical bonding is a good option for companies that frequently utilize tough displays in high-reliability settings or where displays must be viewed in bright situations. Devices that operate outside or in brightly lit conditions are particularly well suited for and significantly more successful when using the optical bonding technique. The screen’s front glass is stacked on top of the LCD module when LCDs, including touchscreens, are made.

What Tips for knowing the merits of optical bonding solutions? 

Refraction is reduced through optical bonding: The same approach is used when light from an outside source shines onto the screen. A non-bonded screen’s gap between the glass and LCD module presents refraction opportunities, which cause glare by reflecting outside light back onto the screen. Light flows through the bonded layers when they are joined together and is slightly absorbed by the screen. Therefore, optical bonding is crucial for making displays sunlight readable.

• Screens are made more physically robust through optical bonding:

Shock is absorbed by the extra resin layer used in optical bonding. This offers exceptional endurance for usage in industries, public access areas, or other severe situations.

• Optical bonding increases durability:

The reality is that adding a resin bonding layer physically inhibits moisture, and dust intrusion between the glass and LCD module is the layer’s most visible advantage. Because of the high production quality, screens in typical conditions don’t have much trouble with water and dust. However, condensation forming between the glass and LCD panel in settings with considerable temperature variations or varying humidity levels might be a concern. Screens may fog up due to condensation from moisture entering the air gap. Once more, the actual filling of the space stops this issue from occurring. Therefore, optical bonding must be taken into account for any outdoor use as well as for any inside application where stable temperatures aren’t maintained.

• Optical bonding prevents condensation:

A touch display with optical bonding keeps a more precise touch response because the pressure is sustained through the substrate rather than being delayed by a gap.

Standard optical bonding techniques:

• Bonding with LOCA:

After the cover glass has been spread with liquid adhesive, the touch/TFT panel is mounted using the LOCA technique. The glue then evenly coats all parts without forming any air bubbles. The adhesive is then cured by UV light without creating much heat. The material is protected from heat and mechanical impact by doing this. The LOCA procedure is one of the most well-known and well-established technologies. It is exceptionally well suited for rigid bonding materials, including glass, plastic, and TFT panels.

• OCA bonding: 

Using an adhesive layer on a touch film carrier, the OCA technology uses a roll lamination mechanism to attach the touch sensor to the cover glass. Air bubbles and other inclusions are lastly removed utilizing an autoclave. This technique may apply protective, UV, and EMC coatings directly to the cover glass or sensor.

• Bonding with gel:

Gel bonding is attaching the display and touch unit with a gel pad. The pads are cut in width, height, and thickness to match the display’s dimensions and form. The touch device is then laminated onto the pad and bonded to a frameless display. In a vacuum that has been created artificially, the touch display device is subsequently assembled.

The Optical bonding solution:

• Soft-to-Soft Lamination (FF):

OCA is a kind of PSA (Pressure Sensitive Adhesive), a pressure-sensitive optical adhesive with a transmission rate greater than 99%. The key variables impacting the paste effect are surface roughness, surface contamination (such as grease, cleaning solution, water, dust, fibers, etc.), bonding time, pressure, temperature, and others.

Release liners are the upper and bottom protective sheets of the colloid. When utilizing, you must first remove the light release layer from one item before pasting it on another, and then you must remove the heavy release layer and do the same.

The force necessary to rip off the release layer, also known as the weight of the release (or release force) (under unit length), is one of the two sides of the OCA with the bigger release.

• Soft-to-Hard Lamination (GFF):

Soft-to-hard bonding, also known as adhesive bonding, is used to join the sensor covered with OCA film to the cover glass.

A semi-automatic vacuum laminating machine is the usual piece of equipment. On the relevant equipment table, the cover glass and the sensor glass that has been OCA plastered are manually put in. It is placed in the vacuum chamber once the CCD (charge-coupled device) has been automatically positioned. The product should be placed in a defoaming machine for defoaming after pressing and lamination to successfully eliminate the air bubbles in the lamination.

• Hard-to-Hard full lamination (TP+OC):

Full lamination entails using optical or water-based adhesive to seamlessly adhere the touch screen, display panel, and glass cover together.

It may offer a superior optical display effect and ultra-thin appearance design compared to the traditional common lamination technique, “frame sticker.” The air layer between the display screen and the touch screen is removed with complete lamination, resulting in a smaller screen. This precisely presented visual effect is more attractive, with less chance of grey entry, a more transparent image, and improved presentation.

• Hard-to-Hard Zero Lamination:

Between complete lamination and air, lamination comes the zero lamination technique. Between the touch panel and the LCD screen, it primarily fills the non-adhesive transparent material with a refractive index comparable to glass. One advantage is that the display effect is improved since there is no space between the TP and the LCD screen. However, because it is not sticky, it is incredibly easy to install, requires little upkeep, and is inexpensive. It may offer a better optical display effect and ultra-thin appearance design when compared to the conventional common lamination technique used in “frame stickers.”

Conclusion:

This article discussed the optical bonding solution, which uses an adhesive to join two thin glass layers. Through this procedure, a solid bond that is impervious to environmental elements like humidity and temperature variations is created. MICRON offers you modern, stylish, ideal products designed to meet consumer wants and worthy of your trust. For us, the requirements of our customers come first. This bonding is frequently used in displays exposed to harsh conditions, including those seen in industrial or medical settings. It is advantageous to utilize in several locations. Additionally, the company provides product sample proofing. After evaluation and trial manufacturing, customers may buy with confidence. We want you to be a lifelong customer. We have made considerable technical progress in a flawless, practical, and advantageous method.