OCA

HOME >> Frequently asked question >> OCA

What is optical bonding?

Optical bonding is the process of laminating cover glass or touchscreens to the LCD cell. Silicone gel or other adhesive, such a urethane, is inserted between the cover glass and LCD to completely fill the air gap. The assembly is cured in a process that affixes the panels together while solidifying the gel.

Why need optical bonding?

For Clarity & Viewability ‐ Optical bonding eliminates the internal reflection between the LCD and the cover glass or touchscreen because the bonding process creates a single index of refraction. It fills the air gap with Optical Clear Adhesive or OCA. While the optical index of OCA is designed to be very close to that of glass, light reflection at those two interfaces is minimized, increases display contrast and viewability. Improved display contrast enables displays to be more readily seen in bright ambient conditions, without increasing backlight brightness and the associated unwanted higher power and higher operating temperatures.

For Protection ‐ LCDs have plastic surfaces that is weak and not weatherproof. To protect LCD, a cover glass or polycarbonate lens installed to protect the LCD is required.

For Resistance to Shake & Shock ‐ Optical bonding can improve resistance to shake and shock. Especially useful for military and transportation applications.

For Prevent Dust & Moisture ‐ Filling the gap between the cover glass or touchscreen and LCD keeps out dust and moisture.

A Partner for Display and Touch Panel.