Optical bonding

Optical bonding

High optical quality

What is optical bonding

Optically transparent bonding

Optical bonding is the process of bonding the touch sensor to the glass surface with a highly transparent liquid adhesive without an air gap. The space between the display and the front screen is filled with a mass adjusted by the calculation index, which significantly improves the contrast ratio compared to a non-bonded display and minimises reflections.

Weisser Polycarbonat Touchscreen Gebondet Medizin Touch Screen

Touchscreens for medicine

Optically bonded with polycarbonate cover glass

What are the advantages of optical bonding?


Optical bonding results in two main optical effects:

Improving the contrast Reducing the reflection To improve the optical quality, this process fills the space between the display and the front screen with a transparent material adapted to the optical refractive index of the touch module and the display, thereby significantly increasing the contrast ratio when compared to a non-bonded display.

This results in displays with excellent readability even in extreme lighting conditions, well-defined contrasts and low reflection.

Open Cell Bonding Industrial Monitor

Open Cell Bonding


What is the cost of optical bonding?

Optical bonding does not have to be expensive

As a guideline quick calculation, prices lie between 1.5 USD to 3.0 USD per inch of display diagonal. To calculate the approximate price just take the display diagonal in inches and multiply it by 1.5 USD to 3.0 USD. Small displays cost less, large displays cost more.

What are the disadvantages of optical bonding?

Very difficult to repair

With optical bonding, the protective glass or touchscreen glass is glued, visually transparent, to the TFT display. Bonding is difficult to remove and the cost of repair is often not economically viable.