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Anti-Glare (AG) treatment

There are 2 different kind of treatment for glass with Anti-Glare processing. A chemical-based surface treatment (chemical AG process) is applied directly to the surface of glass to form micro asperities and give the glass an anti-glare effect under the likes of sunlight. It does not generate any of the minute flaws (micro-cracks) that are characteristic of mechanical AG processes and therefore maintains the high surface strength of the glass.

The other way for AG treatment is manufactured by controlled acid etching process yielding uniform diffused surfaces for anti-glare. Varying levels of diffusion specified as gloss yield different levels of reduced glare. A lower gloss reading denotes a more diffuse panel. The haze ratio of AG glass used on OGS touch screen products cannot be too high, because high levels of haze would affect LCM transmittance. See below figure to have more understanding on specification categories for anti-glare glass.

AG Glass	Cell Phone (OGS)	Monitor/NB (OGS)	Cover Lens
Haze (%)	1.0 ~ 3.0 ± 0.5	3.0 ~ 5.0 ± 0.5	70 ~ 30 ± 5
Gloss Unit (GU)	85 ~ 95	80 ~ 90	10 ~ 50
Ra (Roughness)	< 0.2	< 0.4	0.4 ~ 1.5
Transmittance (%)	90 ~ 95	85 ~ 90	80 ~ 90

Anti-Reflection

An Anti-Reflection (AR) coating is a type of optical coating applied to the surface and other optical elements to reduce reflection by vacuum evaporation process. In typical imaging systems, this improved the efficiency since less light is lost due to reflection. In complex system such as telescopes and microscopes the reduction in reflections also improves the contrast of the image by elimination of stray light.

AR produced destructive interference in the beams reflected from the interfaces and constructive interference in the corresponding transmitted beams, which in creases the transmittance of glass or transparent substrates, the transmittance of glass is approximately 91%, with single sided coating the transmittance can increase to 94~95%, if with double sided coating it can increase transmittance up to 98~99%.

(Principle of Anti-Reflection coating)

Anti-Fingerprint (AFP)/ Anti-Smudge (AS)

The Anti-Fingerprint coating constructions of the preferred embodiments advantages like user is prevented from being imprinted on the surface and it remain clean and aesthetically pleasing. AFP coating makes it possible to wipe up smudge on surface very easily and also has a great hydrophobic performance and protects AR layers and reduced friction and low surface energy and improves scratch resistance. The hydrophobic performance is evaluated each lot by measuring contact angle. The AF effect is realized by applying a nano-coating to reduce the optical contrast of fingerprints.

The AFP effect means that fingerprint on the surface cannot be seen at all by the naked eye, or only very slightly. Although the fingerprint is actually on the surface, it is essentially “invisible”. The color to be coated under visible and infrared light is transparent. Coating is with characteristics like low coefficient of friction, contact angle >100 degree. It utilizes a vacuum coating process which is also thinner and more even than spread coating. The degree of environment pollution is the lowest.

	PR20	PR40	PR50	PR60	PR70
Visible Light Transmitted	21%	39%	50%	60%	69%
Visible Reflection Exterior	6%	7%	8%	8%	9%
Visible Reflection Interior	5%	7%	7%	8%	9%
UV Rejection	99.9%	99.9%	99.9%	99.9%	99.9%
Total Solar Energy Rejected	62%	60%	56%	53%	50%

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