Philips 109B7 User Manual page 31

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Screen coatings
Anti-Static coatings
Due to bombardment by beam electrons, monitor screens become electrically charged when in
use. Electrically charged screens surfaces can attract dust particles. An Anti-Static coating is a
conductive coating deposited on the screen (or on a glass panel immediately in front of the
screen) that conducts away the charge and prevents screen dust build-up.
ARAS (Anti-Reflection, Anti-Static) coating
ARAS is one of the most effective anti-reflection/anti-static screen treatments currently available.
It is composed of a multi-layer structure of transparent dielectric material that suppresses
specular reflections by broadband interference effects at the screen surface. Anti-static
properties are provided by a single conductive layer within the multi-layer structure.
With ARAS, the intensity of reflected light is reduced from around 4.5% of the incident light (the
reflectivity of uncoated screens) to less than 0.5%. ARAS also has a major advantage over other
screen treatments: It doesn't diffuse or scatter reflected light, so picture contrast and sharpness
remain completely unimpaired. It's also easy to clean and tough enough to withstand
commercially available cleaning agents.
The ARAS coating reflects only about 0.5% of the incident light.