Bonding material

Blaze Display Technology Co., Ltd. | Updated: Nov 27, 2018

The primary bonding material used in LCD displays, particularly for optical bonding, is optically clear adhesive (OCA) or resin (OCR). These materials are used to fill the air gap between the LCD panel and the protective cover glass or touchscreen, enhancing display performance and durability. 

Here's a more detailed breakdown:

 

1. Optical Bonding: This process involves using a bonding material to adhere the cover glass or touchscreen to the LCD panel, eliminating the air gap between them. 

 

2. Bonding Materials:

OCA (Optically Clear Adhesive):

A solid, pre-cured adhesive film. It's commonly used in smaller devices like smartphones and tablets and is known for ease of application and consistency. 

OCR (Optically Clear Resin):

A liquid adhesive that is cured (often with UV light) after application. It's often preferred for larger displays or when a thin adhesive layer is needed. 

Other Materials:

While less common, epoxy and polyurethane are also used as bonding materials, each with their own advantages and disadvantages regarding heat resistance, bond strength, and potential for yellowing. 

 

3. Benefits of Optical Bonding:

Improved Sunlight Readability:

Eliminating the air gap reduces reflections, making the display easier to see in bright sunlight. 

Enhanced Touchscreen Accuracy:

A strong bond between the touch panel and LCD improves the accuracy of touch input. 

Increased Durability:

Optical bonding provides a more robust and durable display, protecting against impact, vibration, and environmental factors. 

 

4. Applications: Optical bonding is used in a wide range of applications, including: Mobile phones and tablets, Automotive displays, Industrial and outdoor displays, Medical devices, and Military and aerospace equipment.