Frequently Asked Questions
What is optical bonding?
Optical bonding is the process of laminating cover glass or touchscreens to the LCD cell. An adhesive, 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 would someone need optical bonding?
LCDs have plastic surfaces that are not vandal or weatherproof. To protect your display investment most LCD installations require a cover glass or polycarbonate lens to protect the LCD.
Clarity & Visibility
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. Reducing internally reflected light loss increases display contrast and visibility. 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.
Shake & Shock
Optical bonding is an effective means of improving resistance to shake and shock. This benefit is especially useful for military and transportation applications.
Dust & Moisture
Filling the gap between the protective glass and LCD keeps out dust and moisture. Condensation or dust can make a display unreadable.
Does optical bonding change a display’s operating temperature range?
No. Optical bonding only alters the surface of the display rather than the components, so the operating temperature will not change.
What applications can benefit from optical bonding?
Any display in an outdoor environment or high ambient light conditions can be improved with optical bonding. Example applications include in‐vehicle displays and digital signage, defibrillators, marine displays and in‐flight entertainment systems.
What types of displays can benefit from optical bonding?
Optical bonding can be used on any type of direct view display technology, including AMLCD, plasma, passive LCD, monochrome and transparent electroluminescent, as well as new emerging flat technologies such as OLED (organic light emitting diodes).
What are the different types of bonding?
There are three types of bonding: silicone cured with UV, urethane, and epoxy. We will focus on providing UV curable bonding because of its improved flexibility during the bonding process, but we have experience with all three types of bonding.
What other types of display enhancement services are available?
We can offer a variety of enhancements like coatings and performance films to further enhance viewing performance by minimizing specular reflections (mirror type reflection) or minimizing unwanted high ambient background light and minimize fingerprints.
We can also perform the following display enhancements: · Performance films and coatings o Anti‐glare o Anti‐reflective o Linear and circular polarizers o State‐of‐the art ITO EMI coatings · Vandal glass · EMI shields · Transparent display heaters · LED backlights · Touchscreens
What are the important selection criteria for choosing an optical bonding vendor? Although simple in concept, the process of optical bonding actually involves numerous steps and requires several diverse capabilities. Prospective vendors should: · Demonstrate a track record of optical bonding displays · Have in‐house capability and expertise to properly process your display in a low ESD (Electro Static Discharge) and clean room environment · Test the enhanced displays for their target environments There are numerous “garage shops” offering optical bonding, but only a few have comprehensive quality and engineering systems and processes in place to certify their work.
Why choose you as an optical bonding vendor?
Our optical bonding enhancement technologies make average TFT displays look fantastic. We have a full automated facility and longtime experience bonding overlays to display surfaces, from industrial application, to high performance cockpit AMLCDs. We can deliver consistent quality and predictable results because it has:
Extensive in‐house optical test verification capabilities
We have excellent relationships within the Asian display industry
How long have you been bonding overlays on displays?
We have a long history of optically bonded displays. The company’s facility in Ashville, NC USA ( OD Bond ) has been environmentally encapsulating over 50,000 units. Our revenue is generated by more than 50 % with optical bonding for avionics applications.
What sizes can you bond?
We are currently bonding up to 55” LCD panels.
What are prices?
Prices vary based on size of the display, optical glass surface treatment, volume and lead time.
Have you done any reliability testing of the bonding process?
Yes, we have tested the critical performance metrics to a battery of military environmental and industrial standards, which include temperature cycling and temperature shock extremes, humidity, altitude, mechanical shock and vibration, liquid and dust ingress.
Does your bonding process result in the yellowing of displays that are exposed to UV light?
We are using a 2 state of the art bonding material supplier. Both standard materials does not yellow displays that are exposed to UV light (UV visible light). We will perform yellowing test per customer’s standards to ensure and meet their expectations.