That fold up display will be coming sooner than you think, working prototypes exist! Do you think OLED is easy on the eyes at low backup settings? Prices are kept high by small volume, but phones with 3.7" OLED are now selling at prices no more expensive than comparable ones with LCD screens (notably from Samsung). They are just hitting the market, so I haven't seen one yet. If they do well, it is not difficult to imagine them going for larger screen sizes soon. And they fit the light weight, low power requirements.
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