Optical Coating Selection

  Anti-Reflective (AR) treatment reduces ghost images, which are often produced in builds that have multiple reflective surfaces. Integration of this film optimizes the readability of a display. The film handles both internal and external light sources of an LCD. This means ambient light, and light reflection within the display are reflected in order to increase display readability for the user. AR films come in many thicknesses, varying the amount of destructive interference the film has on reflection. This treatment features high transmittance, low reflectance, durability and an easy-to-clean surface. AR coating as a surface treatment is best suited for medical displays.

  Anti-Glare (AG) reduces glare on a screen to increase readability and reduces fingerprints and smudges. The main difference between anti-glare technology and anti-reflective technology is that AG deal with external sources of light that bounce off the surface of the LCD, such as sunlight or ambient light. The AG coating is a rough, textured coating, created to diffuse reflective light. There is a trade off when using this film; the AG properties reduce glare efficiently but degrade light transmission properties. However, choosing the right type of AG for your application will yield positive results significant to your project, while keeping degradation at unquantifiable levels.

  Oleophobic/hydrophobic in an oil repellant coating that resists dirt, water, grease and oil to prolong and enhance glass performance. This film works by repelling grease and preventing it from sticking to the glass surface. An added feature to this coating is that it is resistant to severe abrasions and scratches due to the oleophobic layer being more slick, reducing friction. Overall, this allows surfaces to be easy-to-clean, and repeated removal of fingerprints all while maintaining pristine image quality, even after repeated cleaning. Unfortunately, this layer has a lifespan; however, it can be prolonged by handling the layer with care. Here are some tips for keeping a lasting oleophobic display:

  • Do not use alcohol-based solvents or household cleaners on the display

  • Use a clean cloth and a small amount of water to clear away smudges and fingerprints

  • Add another layer of screen protection

  Transparent conductive coatings are used in electro-magnetic shielding and electrical heating display applications. These coatings allow for low reflectance but are specific in their applications. The coating features high visible transmission and excellent infrared reflection. Two commonly used conductive coating solutions to combat EMI interference are indium tin oxide (ITO) films or wire mesh solutions. EMI shielding effectiveness generally will correspond with the amount of coating resistance in the particular film solution being used. Most conductive coatings are 30 ohms/sq or below. Fine wire mesh can be conductively plated, increasing shielding effectiveness, with surface resistance numbers close to 0.1 ohms/sq, allowing for a much better shielding effectiveness.