On the surface, smartphones screens made of sapphire sound superb -- they're naturally strong, extremely scratch resistant, can withstand flexing, and transmit light very well. That's the widely accepted story, at least.
Disputing this view is Corning, maker of the Gorilla Glass material that covers a majority of smartphone screens.
Corning, whose aeronautics branch has worked with lab-grown sapphire since the 1970s, says it tested the strength of sapphire claims -- a potential cover glass alternative -- in-house.
Corning's conclusion: that sapphire, the world's second-hardest material after diamond, just can't take the lumps that a … Read more