Air Bonding / Edge Lamination
Air bonding is an important technique in the manufacturing of electronic displays. The air bonding technique uses a special double-sided adhesive. It bond the LCM and the touch panel together, forming a structure with an air gap in the middle. Due to the refraction of light, the display effect of this method is slightly worse than that of full bonding. But it is more cost-effective and easier to implement, making it a high-yield and economical choice.
Optical Bonding / Full Lamination
The optical bonding technology is a full lamination (non-air-gap) technique that uses optical adhesive to fully bond the coverlens, touch sensor, and display module in order to achieve optimal visibility in sunlight. Typically, optical clear adhesive (OCA) or optical clear resin (OCR) is used to fill the gaps and avoid issues like brightness loss caused by air refraction and residual gaps that can interfere with touch sensing. However, due to factors such as configuration, location, labor, and technology, optical bonding usually comes with relatively high production costs.
Full lamination advantages
Full lamination bonding allows the LCM and touch panel to be completely bonded, eliminating the air layer and effectively preventing external light refraction. In addition, the tight bonding of the two also prevents dust and moisture from entering and increases the durability of the product.
Benefits of full bonding technology include:
1. Reduced light reflections
2. Eliminated Newton rings
3. Enhanced display contrast
4. Better dust and moisture resistance, especially in special environments
5. Reduced battery consumption
6. Increased mechanical strength, impact resistance, and vibration resistance of the panel.