Many current flagship mobile phone devices now use glass as the primary build material for protecting both the front display and the back side. Backside glass provides mobile phone manufacturers cosmetic flexibility via the use of non-conductive, vacuum metalliza-tion (NCVM) coating to provide a range of colors. The mobile phone manufacturer has to decide if the NCVM should be coated on the outside of the cover glass providing a nice metallic appearance, or on the inside of the glass where it can be protected from scratches, but results in added glare from the glass interface. Our data show an increase in stress resulting in premature cracking when NCVM is applied to the interior of the back glass. Diamond like carbon (DLC) enables the NCVM to be coated on the glass outer surface without compromising glass breakage strength. We observe a ～5x improve-ment in the breakage performance for DLC protected outer NCVM compared to NCVM on glass interior. We will present comparison data of NCVM with and without DLC coating for scratch, breakage and wear testing. Additionally, we will show how DLC improves long term breakage resistance of backside glass.
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