Acer's U5 all-in-one can fold down flat with one finger.
The Aspire U5 has a IPS 23-inch 1,920x1,080 display that folds down and back on a kickstand until it lies flat.
The big difference between this and true tabletop PCs such as the Lenovo Flex 20 and HP Rove 20 is that the U5 doesn't include a battery
The 23-inch screen has an anti-fingerprint coating, which should be helpful, as the main reasons you'd want to fold a screen like this down into tabletop mode is to interact with maps and photos, or play finger-friendly games such as air hockey.
Like many all-in-one PCs, it includes an HDMI input, so you can use the HD display with a game console or other media device.
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