More than 1 billion smartphones are sold in the world each year and manufacturers all face the same challenge: how to make the touchscreen glass more resistant. Screen breakage is now the leading type of phone damage. Consumers want phones that are both bigger and thinner, offsetting strides made in strengthening glass

At New York based glass-maker Corning, researchers are working on ways to make smartphone screens stronger. Corning manufactures the touchscreen glass for smartphones by leading brands like Apple and Samsung. Screens are tested to see how they respond to pressure, to being dropped and to falling objects. The researchers even test how phones fare when they bump against keys, coins and other items inside users’ pockets and purses.

“Devices are getting thinner. They’re getting larger. They’re getting potentially more massive. They have shaped-cover glass. They have curved-cover glass. And so all of that puts higher stresses on the cover glass during things like drop ev