Smartphone companies bet big on foldable screens

Smartphone makers are betting big on foldable screens that fit into a pocket to revive a market mired in an innovation lull and a sales slump.

Samsung Electronics Co Ltd revealed its much-anticipated foldable phone, which is a tablet when it is fully opened and becomes a smartphone when closed, at the company's annual developers' conference in San Francisco in November.

It uses a new display technology called Infinity Flex Display that allows users to open and close the device a countless number of times without degradation.