Optical Bonding

Optical bonding is the process of adhering two or more substrates (eg. LCD and touch or cover glass) with optical clear adhesives.
The optical bonding process of Twinwill applies both gel adhesives (dry bonding) and liquid adhesives (wet bonding). If compared
to the traditional way for attaching LCD and touch panel by applying double-sided tapes on the four edges (air-gap bonding),
the main disadvantage of air-gap bonding is that internal reflecting surfaces leads to degradation of optical performance.

The advantages of Optical Bonding include:
* To reduce internal reflection to achieve sunlight readability
* To enhance ruggedness and shock and vibration resistance
* To enhance moisture resistance
* To prevent condensation under low temperature
* To increase brightness
* To improve contrast ratio
* To enlarge viewing angle

Advantage of Twinwill’s Optical Bonding
** Re-workable, materials loss(for LCD and TP) is much lower than competitors
** Good bonding gap/thickness control
** Optional dry bonding or wet bonding
** No delay bubble
** No yellowish issue after years
** Low air pressure resistivity (1hr @ 15000m high)
** Comparison of Dry Bonding and Wet Bonding

The Comparison between Dry Bonding vs Wet Bonding
Items	Dry Bonding	Wet Bonding
Quality Control	Very good	Good
Reworkability	High	Low
Bonding Strength	Normal	Very good
Twist Resistivity	Normal	Good
Production Rate	Fast	Slow
Optical Performance	Excellent	Excellent
Yield Rate	Very high	High
Screen Size	Up to 27”	Up to 27”
Thickness Control	Very good	Normal
Internal Shear	None	Some
Cleaning	None	Necessary

Post time: Nov-05-2019