While standard air bonding leaves an air gap between the cover lens and the display, optical bonding fills this gap with specialized OCA (Optically Clear Adhesive) or LOCA. This structural difference fundamentally changes the display's optical, mechanical, and environmental performance.
Optical Bonding vs. Air Bonding (Performance Comparison)
Feature
Air Bonding (Tape)
Optical Bonding (OCR/OCA)
Sunlight Readability
Poor (High Reflection)
Excellent (Low reflection & outdoor clarity)
Contrast Ratio
Standard
High (Up to 400% improvement)
Moisture & Condensation
High risk of fogging
Zero Fogging (100% hermetic seal)
Impact & Vibration Resistance
Basic
Rugged (Solid adhesive layer)
Visual Appearance
Visible gap
Seamless (Zero parallax)
Optical Bonding Technologies & Methods
Optical Bonding
Size Range
Notes
OCA
Up to 15.6”
Two fully automated production lines for high-volume manufacturing
LOCA / OCR
Up to 32”
Excellent for high contrast and durability
Silicone
Up to 32”
Ideal for rugged, large-size industrial applications
Advanced Applications & Special Visual Effects
Full Black Touch Display Module (Seamless Black Appearance)
Based on optical bonding technology, FANNAL adjusts various parameters to achieve a Full Black Touch Display Module.
When TFT is powered off the VA area looks similar to black as the cover BM. The color difference between the cover BM and the TFT VA can be △E ≤2
This effect can be achieved through multiple techniques, including ink formulation, monochrome OCA, or monochrome glass.
Eliminates Internal Reflection: Reduces total surface reflection from 8.5% (air bonding) to under 1%, keeping images clear without increasing backlight power.
AG (Anti-Glare): Diffuses reflected light to reduce glare. AR (Anti-Reflective): Increases light transmission for higher clarity.
AF (Anti-Fingerprint): Prevents smudges and keeps the screen clean.
Energy-Efficient Performance: Increases contrast ratio by up to 400% in bright light, reducing backlight power consumption and heat.
Display Panel Options for Optical Bonding Integration
Optical bonding integrates the display panel with the touch screen or cover glass into a single solid unit. FANNAL provides flexible bonding integration based on your panel specifications and project requirements.
Bonding for Standard Brand Panels
For customers with preferred display suppliers, FANNAL offers procurement and full optical bonding integration for original panels from your preferred brands and
touchscreen modules.
Competitive Pricing: With bulk sourcing for multiple projects, we achieve cost advantages through centralized procurement. Ready Stock for Common Models:We maintain an inventory of frequently used display models to ensure faster delivery and stable supply.
Building upon our Optical Bonding technology, FANNAL offers Custom Touch Monitor Assembly services — integrating display and touchscreen into a single, high-performance module.
Monitor
Built-in 10-point PCAP multi-touch panel with USB interface
Wide operating temperature
Support VESA mounting
Anti-glare screen with tempered glass
Slim design enables easy installation
Curved Touch Monitor solution——Shape: "C" & "J"
Custom cover glass: size/thickness/surface treatment
Touch screen performance according to requirements
Display performance according to requirements
Custom mounting configurations
Custom housing designs
Alternative video input options
Multi operating system options: Windows/Android
Case Studies
Success stories from clients from various industries, to see if there are similarities with your requirements.
Dust & Fog-Free Optical Bonding
Customer Issue: Previous in-house bonding caused visible dust between panels, resulting in poor appearance. Additionally, screens experienced condensation in winter, leading to display issues.
FANNAL Solution: Using optical bonding technology, air gaps between panels are eliminated, enhancing both aesthetics and durability.
Result: The displays are now dust-free and clean, free from condensation issues, seamlessly integrated, visually more appealing, and overall quality has significantly improved.
One-Stop Optical Bonding Solution
Customer Issue: The customer previously had to work with separate suppliers for displays, touch panels, and bonding, making the process complex, costly, and hard to manage.
FANNAL Solution: FANNAL offers a three-in-one, one-stop solution: sourcing original displays, customizing touch panels, and performing in-house optical bonding, all under unified management.
Result: Reduced costs, controlled inventory, stable quality, simplified process, and a more reliable final product.
Process Flow Diagram Of Optical Bonding
Whether frame bonding, OCA, or OCR, all processes are completed in-house, enabling a one-stop and fast response.
OCA Process
STH
Debubbling
HTH
Debubbling
Visual Inspection
Fully Curing
OCR Process
Material Loading
OCR Coating
Point Curing
Surface Curing
Spilled Glue Cleaning
Side Curing
Fully Curing
FAQ
Looking for specific details? See our detailed FAQs. If you have any questions, please feel free to get in touch with us.
A For outdoor applications, it’s essential to use OCA/OCR with anti-UV protection to prevent yellowing and maintain optical clarity under sunlight exposure.
Yes. Fannal supports OEM optical bonding — integrating customer-provided LCD modules with our custom cover glass, touch screen, or AD board while ensuring full optical and electrical compatibility.
A No. Optical bonding actually improves touch performance by reducing the air gap between layers, resulting in faster response and more accurate detection, even under gloves or wet conditions (depending on touch sensor type).
A Cost depends on display size, adhesive type, and production volume. Optical bonding adds value through longer lifespan, better visibility, and improved durability, often reducing maintenance and replacement costs over time. Fannal provides flexible quotation and sample testing before mass production.
A The primary difference lies in the adhesive state: OCA (Optically Clear Adhesive) uses a pre-cut dry film, while LOCA (Liquid Optically Clear Adhesive) utilizes a liquid resin. OCA is ideal for high-volume production of standardized flat screens, whereas LOCA is the superior choice for large-format industrial displays, curved surfaces, and uneven gaps due to its superior gap-filling capabilities and reworkability.
A Optical bonding is essential for LCDs operating in high-ambient light environments or rugged conditions where readability and durability are critical. You should specify optical bonding when your application requires the elimination of internal reflections (air gap removal), prevention of moisture condensation/fogging, or enhanced structural resistance against mechanical shock and vibration.
Questions about touch displays or custom solutions? We understand every project has unique needs. Tell us about your requirement — our engineers will respond within 24 hours.
