Optical bonding | Michel ITC

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Optical bonding

In optical bonding, individual components are bonded together. The result is a very high-quality and stable HMI (Human Machine Interface) connection. This composite can be specifically adjusted or defined according to your requirements and the field of application.

We offer you different technologies and services for optical bonding. In most cases we laminate glass surfaces or PMMA components with membrane switches, touches and/or displays in the clean room.

The four main advantages of optical bonding

1. reduction of reflections

The main advantage of optical bonding is the improved readability and high color transmission of the display, even under different lighting conditions and viewing angles. A highly transparent adhesive fills the air gap between the glass and the display. This prevents annoying light reflections and reduces refraction, which increases contrast and optical brilliance. In addition, the adhesive balances tension and does not impair the thermal expansion of the individual components.


2. protection against foreign objects and condensation

Due to the high-quality bonding of the individual components, no foreign particles or dust particles can get into the field of vision. In addition, there is 100% protection against condensation.

3. increased stability

Due to the full-surface and high-quality bonding, a stable compound is created, which has a very high vibration and impact resistance. In addition, this composite ensures a long lifetime, even when it's used under extreme (outdoor) weather conditions.

4. improved touch performance

PCAP sensors are reliant on the finger getting as close as possible to the sensor level. The larger the air gap between the user interface and the touch sensor, the poorer the performance of the touch unit. The air gap thus isolates the touch, the operation of the surface is restricted and may be delayed under certain circumstances. The high-quality liquid adhesive (also gel bonding) used in optical bonding behaves similar to glass after curing and therefore no longer represents an obstacle to operation.


In "Optical Bonding" we have four different and established technologies. Depending on the field of application, we will find the best possible solution for you.

Liquid bonding

High-quality bonding in a clean room with liquid adhesive.

Areas of use: high-quality industrial and telecommunications applications; E Mobility; ideal for outdoor use

+ optimum colour and contrast reproduction from the display
+ optimum protection against dust and condensation
+ maximum performance of the PCAP sensor
+ extra strong composite
- costs for tooling

Gel bonding

High-quality bonding in the clean room with gel-like adhesive on sheets.

Areas of use: high-quality industrial and telecommunications applications; e-mobility; also for outdoor applications

+ optimum colour and contrast reproduction from the display
+ optimum protection against dust and condensation
+ very high vibration and shock resistance
+ easier to apply than liquid adhesive
- costs for tooling

Tape bonding (OCA)

Bonding in a dust-free environment with double-sided highly transparent adhesive tape.

Areas of use: simple bonding of viewing windows with display and PMMA reinforcements; bonding of foils / membrane switches with resistive touch units or glass with capacitive touch, for medium requirements

+ no mounting tools necessary
+ does not necessarily have to be installed in the clean room
+ small production lots possible
- for outdoor use only conditionally applicable

Frame bonding

Frame bonding in a dust-free environment on partially cut out adhesive.

Areas of use: simple bonding of displays to operating foils and membrane switches

+ proven bonding of displays
+ no clean room required for assembly
- conditional protection against dust and condensation
- air gap remains

Get us involved

Many years of know-how and a large number of industrial bonding projects have enabled us to offer various solutions for small, medium and large quantities at competitive prices.

We procure the necessary components (glass, touch sensor, display) prefabricated, either in Europe or China, bond/glue at our locations and deliver the HMI unit to the desired destination, worldwide.

Contact us for more information. We will be happy to advise you.