Fans of science fiction writer William Gibson will also be impressed; in his 1986 novel Count Zero, Gibson wrote about an amazing cell phone with a screen that unfolded like a butterfly's wings:
He took an elegant modular unit from the bag and placed it in front of her. A paper thin polycarbon screen unfurled silently from the top of the unit and immediately grew rigid. She had once watched a butterfly emerge into the world, and seen the transformation of its drying wings. 'How is that done?' she asked, tentatively touching the screen." (Read more about Gibson's polycarbon phone screen.)
Lenovo actually put out a folding computer last year, the amazing Lenovo Thinkpad Fold X1. Unfortunately, the software was not up to par, but it's great hardware.
Update 20-Apr-2022: Although this is more pocket-sized, consider the Folding Computer Terminal from The Merchants of Souls (2002) by John Barnes:
The customers looked up, saw the Occitan costume, stared at me for half a breath, and went back to their food or conversations. A few pulled out computer terminals from their pockets, unfolded them like handkerchiefs, and made a quick entry.
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