When we first started seeing foldable device concepts a few years back, I was intrigued but not particularly impressed. Many of those early prototypes felt very much like experiments: they were often bulky and the bendy displays seemed fragile. And there were creases.

Thankfully, display tech has come a long way in just a few years. That was particularly evident at LG Display’s booth at CES this year, where the company showed off two new mobile OLED concepts: a 17-inch laptop/tablet and an...

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