Mobile Displays: Battle Of Glasses

The Smartphone Screen is one of the important components of the device as this is where you will spend most of the time interacting with it. We all stick screen guards to protect it from those scratches or hairline breaks and also pack them in cases so that it does not shatter on fall. So the best way to avoid the agony is to make the screen completely scratch resistant but still not scratch proof. Let’s now take a detailed look at what it as well others have to offer.

1) Corning Gorilla Glass:

Gorilla Glass is an alkali-aluminosilicate sheet toughened glass developed and manufactured by corning. The glass combines thinness, lightness, and damage-resistance properties and is widely used as a cover glass on most smartphones, tablets, etc. fusion and Ion-Exchange processes are employed in making the glass. In the fusion process raw materials (silicon dioxide) are blended into a glass composition, which is melted and conditioned. The resulting glass is aluminosilicate that combines aluminium, silicon and oxygen. The molten glass is fed into a trough called an isopipe. It then re-joins, or fuses, at the bottom, where it is drawn down to form a continuous thin sheet of flat glass. Ion exchange is a chemical strengthening process where large ions are stuffed into a glass surface. The glass is placed in a hot bath of molten salt at a temperature of approximately 400 degrees. Smaller sodium ions leave the glass, and larger potassium ions replace them. These large ions are pressed together producing a layer of compressive stress on the surface of the glass. This allows the potassium ions to diffuse far into the surface, creating high compressive stress deep into the glass. This layer of compression creates the surface that is more resistant to damage.

2) Sapphire Glass:

Sapphire is not new and it’s not just a Gemstone. It is a transparent crystal that happens to take on some attractive hues yellow, purple, orange, etc. when it forms naturally. However Pure Sapphire is hard to find thus synthetic sapphire has been widely used in wristwatch, crystals, windows, camera lenses, etc. Synthetic sapphire is manufactured by applying high heat and pressure to aluminium oxide powder (sapphire is, after all, just a compound of aluminium and oxygen). It is heat treated to eliminate its internal stresses which can cause weakness and later processed into sheets to form what is known as sapphire glass. And that’s what ends up on your phone as a cover glass.

It is 4 times tougher than glass and is also considered as hardest material after moissanite and diamond, projecting a value of 9 on mohs scale that measures mineral hardness. The key benefits of sapphire is that it is highly transparent to wavelengths and highly resistant to scratching and abrasion. Apple is now implementing this glass display in touch ID of the iphone5s, iphone6, iphone6s, ipadmini3, ipadmini4, and the display of the apple watch. Also, sapphire covers are used for the rear camera in newer versions of iphone5 etc. and every ipod touch (5th generation) or newer.

3) Dragontrail Glass:

Dragon trail, Manufactured by Asahi Glass Co, is an alkali- aluminosilicate sheet glass which has properties like thinness, lightness, and damage-resistance, similar to the Gorilla Glass. The glass is produced using High-Ion Exchange process which is then chemically strengthened to achieve scratch, break/impact, and shock resistance. The resulting glass is strong, Lightweight and flexible. The material’s primary properties are its strength, allowing thin glass without fragility, its high scratch resistance and its hardness making it an ideal solution for cover glass and touch screen applications. Dragon trail was launched in 2011 and is used by the Oplus Xonphone 5, Sony Xperia Z series, Xiaomi MI2 and Redmi, Galaxy Nexus and Xolo Models, etc.

4) Soda lime Glass:

Soda-lime Glass is relatively inexpensive, chemically stable, reasonably hard, and is capable of being re-softened and re-melted numerous times, thus it is ideal for glass recycling also. It is prepared by melting the raw materials, such as sodium carbonate (soda), lime, dolomite, silicon dioxide (silica), aluminium oxide
(alumina), and small quantities of fining agents e. g ., sodium sulphate in a glass furnace at temperatures locally up to °C.

5) Comparison:

Gorilla Glass vs. Sapphire Glass:

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Sapphire is much harder to scratch than corning’s industry leading Gorilla Glass or Dragon trail glass. From the manufacturer’s point the hurdle in implementing sapphire on displays is its manufacturing cost. It’s about 10 times more expensive and 1.6 times heavier than glass. Also it requires more energy to generate a sapphire crystal than it does to generate glass. Producing sapphire of the same quantity as Gorilla Glass is nearly three times more expensive as it involves large furnaces and diamond to make it ready for the purpose. Sapphire is harder not stronger and is less likely to get scratched. On the other hand, Gorilla Glass may survive a fall more often than sapphire thus implementing sapphire means dimmer devices.

Gorilla Glass vs. Dragon trail:

Both these glasses are very hard, tough and scratch resistant. It should be noted that these glasses are scratch resistant not scratch proof, which indicates an object resistance to something upto a particular limit or potential. On the other hand being scratch proof means that they have almost unlimited level of resistance and cannot be penetrated by a particular thing or object. Thus it indicates that both these glasses can guard themselves from scratches or damage to a certain vantage point, but they can scratched can be damaged if you drop them from a great height or apply too much pressure with a very pointed object. So if you are in for market looking for a smartphone equipped with any of these glasses you should not worry about much.

Below is comparison table, Will give you an idea which glass is how much strong.

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Is There Something, We Missed Out, Let Us Know In Comments Section Below, And I’ll Catch You In Next One.

Information Brought To You By Biovolt Corporation.

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