Optical Bonding

Your Professional Optical Bonding Supplier!

Optical Bonding is a proven solution for improving display clarity, durability, and performance in demanding environments. As experienced China Optical Bonding manufacturers, Hengstar provides reliable bonding services for industrial displays, touch screens, and high-brightness panels. Founded in 2004, Hengstar integrates R&D, production, and sales to support global buyers with flexible OEM and custom solutions. Our Optical Bonding services are widely used in industrial control, outdoor Digital Signage, and medical applications, making us a dependable partner among professional Optical Bonding suppliers worldwide.

Why Choose Us

Professional Team

The company has a professional R&D team composed of top talents in the industry, with strong technical innovation capabilities and rich project experience.

Quality Control

The company provides leading display technology, mature automation control solutions, and perfect supply chain management services to ensure the stability and reliability of product quality.

Patents and Certifications

The company has 15 independent intellectual property use patents and 5 invention patents, and has CCC, CQC, CE, SGS certifications in the electrical industry, industry production licenses, and ISO9000 system certifications.

Advanced Equipment

The company is equipped with five digital signal generators, three automated production lines, a 500-square-meter Class 100 automatic bonding workshop, a 100-square-meter aging workshop, 30 automated assembly motors and other advanced equipment.

Types Of Optical Bonding

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.

Materials Used for Optical Bonding

Silicon	Silicon is widely used as an adhesive because it is flexible, can withstand high temperatures, and can absorb shocks and vibrations. It also has good optical transparency and doesn't turn yellow over time, which helps to maintain the display's visual clarity. However, when rubbed, silicon can produce debris around the edges, making edge protection necessary in applications such as touchscreens.
Epoxy	Epoxy offers better heat resistance and a stronger bond than silicon, making it ideal for high-precision and structural applications. However, once bonded, it is not reworkable. It also requires a careful application because it cures so fast.
Acrylic	This material is suitable for rapid production processes as it is UV-curable. However, it might have lower heat resistance than other options and can shrink slightly during curing, requiring precise application.
Polyurethane	Polyurethane adhesives can endure extreme conditions but are more expensive than other options like silicone and epoxy. They tend to turn yellow over time when exposed to light.

Key Benefits of Optical Bonding

Improved Display Clarity and Visibility

By eliminating the air gap between the display and the cover glass or touch panel, optical bonding reduces internal reflections caused by ambient light.

Increased Durability and Protection

The bonding process strengthens the display, making it more resistant to impacts, scratches, and breakage. It also provides better protection against dust, moisture, and other environmental contaminants, which is crucial for devices used outdoors or in industrial settings.

Enhanced Touchscreen Performance

For devices with touch interfaces, optical bonding can improve touch sensitivity and accuracy. This is because the touch sensor is closer to the surface, reducing the parallax effect and making the touch interface more responsive.

Reduced Glare and Reflection

Optical bonding minimizes glare from external light sources, enhancing the display’s readability in various lighting conditions. This is particularly beneficial for devices used outdoors or under bright lights.

Better Image Quality in Rugged Conditions

For applications that require rugged displays, like in military or industrial use, optical bonding helps maintain image quality under harsh conditions, including extreme temperatures, vibrations, and shock.

Aesthetic Improvement

Displays with optical bonding often have a more streamlined and attractive appearance. The elimination of the air gap can make the screen look more vivid and closer to the surface, which is aesthetically pleasing.

Optical Bonding Structure

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Examples of Optical Bonding Applications Across Industries

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

Medical, Healthcare, and Pharmaceutical:
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.

Optical Bonding Process

Preparation

The process starts with choosing the appropriate type of glue depending on the required display parameters, such as its size, location of the device (indoors or outdoors), and estimated operating temperatures. At this stage, the display, glass, and touch panel must be thoroughly cleaned.

Adhesive injection

This involves precisely applying glue on the entire screen surface. The specific glue recipes are strictly protected, although there three general types of bonding materials: silicones, epoxy resins, polyurethanes (now becoming obsolete due to yellowing over time).

Bonding and treating

This is the crucial step of the entire process because it’s applying the touch panel to the LCD module. Avoiding any gaps and air bubbles is the most important issue here. Then the glue is treated with UV light, as traditional heat treatment would increase the risk of material shrinkage.

Packaging and Shipping

Packaging	Anti-static tray, paper box
Transportation methods	Road transport, rail transport, sea transport, air transport

Our Certificate

FAQ

Q: What is optical bonding?

A: Optical bonding serves to bond the display with the touch panel. This process requires carefully selected glue and unique manufacturing technology (usually protected by patents or business confidentiality). This results in high-quality final products with better optical performance, durability, and further benefits described in the article.

Q: What is the purpose of optical bonding?

A: Optical bonding is the process of gluing the touchscreen glass to the LCD cell in order to completely fill the air gap between them. This is done to improve overall performance, decrease the total display weight, and make the touchscreen sturdier.

Q: What is the optical contact bonding process?

A: Optical contact is a bonding method which does not require any glue or cement but instead relies on physical and intermolecular adhesion of the highly polished conformal surfaces.

Q: What is the difference between air bonding and optical bonding?

A: Air bonding and optical bonding are two methods used to attach a touch panel or cover glass to a display module, but they differ significantly in how they achieve this. Air bonding uses adhesive tape around the edges of the components, creating an air gap between them. Optical bonding, on the other hand, fills the gap between the layers with an optically clear adhesive, eliminating the air gap.

Q: What materials are used for optical bonding?

A: Silicone solutions, such as OCR (optically clear resin) or LOCA (liquid optically clear adhesive) are strong candidates to consider for optical bonding applications due to their overall design flexibility, as well as their tendency to remain clear over long time periods.

We're professional optical bonding manufacturers in China, specialized in providing high quality customized service. We warmly welcome you to buy optical bonding in stock here and get pricelist from our factory. For price consultation, contact us.