Optical Bonding for Industrial HMI

Overview

Optical bonding is the decisive quality factor for modern HMI systems: better readability in sunlight, higher contrast, fewer reflections – and at the same time a robust, industrial-grade module.

OCR (Optically Clear Resin)

Our OCR process utilizes a liquid, transparent silicone material that is applied between the display and the front unit and then thermally cured. The 2K silicones used were specially developed for display applications – offering outstanding optical clarity, flexibility, and long-term stability.

Advantages of the OCR process:

• Perfect optical properties – even in direct sunlight or at oblique viewing angles
• Very good damping of vibrations and mechanical shocks
• No yellowing – even under UV/heat influence
• Reworkable (display replacement possible)
• Permanently elastic - extremely low stress, even with temperature changes
• Water-repellent - can be used without problems in environments with high humidity
• Thanks to low-viscosity, self-leveling material properties, the silicone ideally adapts to complex surfaces – effectively preventing bubbles and inclusions

Highly flexible application:

OCA (Optically Clear Adhesive)

In this process, we use highly transparent adhesive films that are laminated between the display and the glass/touch unit in vacuum processes without air inclusions. The result: a durable, optically high-quality, and flat bond.

Advantages of the OCA process:

• Thin construction
• High optical purity
• Very efficient for flat displays and medium quantities
• Size range: from 5" to 31.5"

Touch Lamination

Touch lamination is a central process step for high-quality HMI systems. It connects glass, touch sensor, and display into an optically clear, stable, and durable unit.

Your Advantages

• Cleanroom process according to ISO 14644-1 Class 7
  Particle-free and process-reliable – for the highest optical demands.
• Flexible design implementation
  Edge-to-edge, free forms, and functional films can be technically implemented without issues.
• Highest alignment accuracy
  Camera-based alignment systems for precise positioning.
• Long-term stable & robust
  Autoclaved laminations with high stability against temperature, humidity, and vibration.
• Scalable for your requirements
  From small quantities to series production – short setup times, high flexibility.

Technical Parameters

• Laminatable sizes: 5″ to 75″
• Materials: Glass, ITO films, PET, Polycarbonate, functional films
• Alignment tolerance: typ. < ± 250 µm
• Process steps: Lamination & Autoclaving
• Manufacturing environment: ISO Class 7 cleanroom

Insights into Cleanroom & Manufacturing

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